Iron ores -- Determination of phosphorus content -- Titrimetric method

ISO 2599:2003 specifies a titrimetric method for the determination of the phosphorus content of iron ores, using hexaammonium heptamolybdate (ammonium molybdate).
This method is applicable to a concentration range of 0,10 % (m/m) to 5,0 % (m/m)  of phosphorus in natural iron ores, and iron ore concentrates and agglomerates including sinter products.
This International Standard provides a quality control method for the determination of phosphorus by titration, however, the method cannot be used for referee purposes.

Minerais de fer -- Dosage du phosphore -- Méthode titrimétrique

Železove rude – Določevanje fosforja – Titrimetrijska metoda

General Information

Status
Published
Publication Date
31-Oct-2005
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Nov-2005
Due Date
01-Nov-2005
Completion Date
01-Nov-2005

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INTERNATIONAL ISO
STANDARD 2599
Third edition
2003-02-15
Iron ores — Determination of phosphorus
content — Titrimetric method
Minerais de fer — Dosage du phosphore — Méthode titrimétrique
Reference number
ISO 2599:2003(E)
ISO 2003
---------------------- Page: 1 ----------------------
ISO 2599:2003(E)
PDF disclaimer

This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but

shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In

downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat

accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.

Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation

parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In

the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.

© ISO 2003

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,

electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or

ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2003 — All rights reserved
---------------------- Page: 2 ----------------------
ISO 2599:2003(E)
Contents Page

Foreword............................................................................................................................................................ iv

1 Scope...................................................................................................................................................... 1

2 Normative references ........................................................................................................................... 1

3 Principle ................................................................................................................................................. 1

4 Reagents ................................................................................................................................................ 2

5 Apparatus............................................................................................................................................... 3

6 Sampling and samples ......................................................................................................................... 3

6.1 Laboratory sample................................................................................................................................ 3

6.2 Preparation of predried test samples ................................................................................................. 4

7 Procedure............................................................................................................................................... 4

7.1 Number of determinations ................................................................................................................... 4

7.2 Test portion ........................................................................................................................................... 4

7.3 Blank test and check test..................................................................................................................... 4

7.4 Determination ........................................................................................................................................ 5

8 Expression of results............................................................................................................................ 7

8.1 Calculation of phosphorus content .................................................................................................... 7

8.2 General treatment of results ................................................................................................................ 7

8.3 Oxide factor ........................................................................................................................................... 9

9 Test report.............................................................................................................................................. 9

Annex A (normative) Flowsheet of the procedure for the acceptance of analytical values for test

samples................................................................................................................................................ 10

Annex B (informative) Derivation of repeatability and permissible tolerance equations ......................... 11

Annex C (informative) Precision data obtained by international analytical trials...................................... 12

© ISO 2003 — All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 2599:2003(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies

(ISO member bodies). The work of preparing International Standards is normally carried out through ISO

technical committees. Each member body interested in a subject for which a technical committee has been

established has the right to be represented on that committee. International organizations, governmental and

non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the

International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards

adopted by the technical committees are circulated to the member bodies for voting. Publication as an

International Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 2599 was prepared by Technical Committee ISO/TC 102, Iron ore and direct reduced iron, Subcommittee

SC 2, Chemical analysis.

This third edition cancels and replaces the second edition (ISO 2599:1983), which has been editorially revised.

iv © ISO 2003 — All rights reserved
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 2599:2003(E)
Iron ores — Determination of phosphorus content — Titrimetric
method

WARNING — This International Standard may involve hazardous materials, operations and equipment.

This International Standard does not purport to address all of the safety problems associated with its

use. It is the responsibility of the user of this International Standard to establish appropriate health

and safety practices and determine the applicability of regulatory limitations prior to use.

1 Scope

This International Standard specifies a titrimetric method for the determination of the phosphorus content of

iron ores, using hexaammonium heptamolybdate (ammonium molybdate).

This method is applicable to a concentration range of 0,10 % (m/m) to 5,0 % (m/m) of phosphorus in natural

iron ores, and iron ore concentrates and agglomerates including sinter products.

This International Standard provides a quality control method for the determination of phosphorus by titration,

however, the method cannot be used for referee purposes.
2 Normative references

The following referenced documents are indispensable for the application of this document. For dated

references, only the edition cited applies. For undated references, the latest edition of the referenced

document (including any amendments) applies.
ISO 648:1977, Laboratory glassware — One-mark pipettes
ISO 1042:1998, Laboratory glassware — One-mark volumetric flasks
ISO 3082:2000, Iron ores — Sampling and sample preparation procedures

ISO 3696:1987, Water for analytical laboratory use — Specification and test methods

ISO 7764:1985, Iron ores — Preparation of predried test samples for chemical analysis

3 Principle

The test portion is decomposed by treatment with hydrochloric, nitric and perchloric acids. The insoluble

residue is filtered and the filtrate is reserved as the main solution.

The residue is ignited, treated with sulfuric and hydrofluoric acids to remove silicon dioxide, fused with sodium

carbonate and the melt is leached with water. The alkaline solution is filtered and the residue is discarded.

1) This method has been tested internationally on samples containing phosphorus contents ranging from 0,03 % (m/m) to

1,50 % (m/m).
© ISO 2003 — All rights reserved 1
---------------------- Page: 5 ----------------------
ISO 2599:2003(E)

The filtrate from residue treatment is acidified using hydrochloric acid, iron(III) chloride is added and the

phosphorus is collected by precipitation with ammonia solution. The precipitate is dissolved in hydrochloric

acid and combined with the main solution. Hydrobromic acid is added and evaporated to fumes of perchloric

acid to expel arsenic. The salts are dissolved in water and the solution, or an aliquot, is neutralized with

ammonia solution and the acidity is adjusted using nitric acid. The solution is cooled to 20 °C and vanadium is

reduced by iron(II) sulfate. Ammonium molybdate is added to the cold solution and the yellow precipitate of

ammonium molybdophosphate is collected by filtration.

The precipitate is washed free of acid and dissolved in a slight excess of sodium hydroxide, the excess being

titrated with nitric acid.

For test portions containing more than 18 mg of titanium, a modified procedure is used (see 7.4.1.2).

4 Reagents

During the analysis, use only reagents of recognized analytical grade, and only water that conforms to grade 2

of ISO 3696:1987.
4.1 Ammonium nitrate (NH NO ).
4 3
4.2 Sodium carbonate (Na CO ), anhydrous.
2 3
4.3 Hydrochloric acid, ρ 1,16 g/ml to 1,19 g/ml
4.4 Hydrochloric acid, ρ 1,16 g/ml to 1,19 g/ml diluted 1 + 1.
4.5 Nitric acid, ρ 1,42 g/ml.
4.6 Nitric acid, ρ 1,42 g/ml diluted 1 + 50.
4.7 Nitric acid, ρ 1,42 g/ml diluted 1 + 5 000.
4.8 Sulfuric acid, ρ 1,84 g/ml.
4.9 Sulfuric acid, ρ 1,84 g/ml diluted 1 + 1.

4.10 Perchloric acid, ρ 1,54 g/ml, 60 % (m/m) solution, or ρ 1,67 g/ml, 70 % (m/m) solution.

4.11 Hydrofluoric acid, ρ 1,13 g/ml, 40 % (m/m) solution.

4.12 Hydrobromic acid, ρ 1,38 g/ml, 40 % (m/m) solution or ρ 1,48 g/ml, 47 % (m/m) solution.

4.13 Ammonia solution, ρ 0,9 g/ml.
4.14 Hydrogen peroxide, 30 % (m/m) solution, free from phosphate stabilizer.
4.15 Potassium nitrate, 10 g/l solution.
4.16 Ammonium molybdate, solution.

Dissolve 40 g of finely pulverized crystalline ammonium molybdate tetrahydrate [(NH ) Mo O ⋅4H O] in

4 6 7 24 2

300 ml of warm water and 80 ml of ammonia solution (4.13). Allow the solution to cool and add this solution in

small portions to 600 ml of nitric acid (1 + 1), while stirring. Add a few milligrams of sodium hydrogen

phosphate or ammonium hydrogen phosphate and allow to stand for at least 2 d. Filter before use.

2 © ISO 2003 — All rights reserved
---------------------- Page: 6 ----------------------
ISO 2599:2003(E)
4.17 Iron(III) chloride solution, containing 3 g of Fe/l.

Dissolve 0,3 g of pure iron, with as small a content of phosphorus as possible, by treatment with hydrochloric

acid (4.3), add a few drops of nitric acid (4.5) to oxidize the iron, and boil the mixture to remove chlorine.

Allow the solution to cool and dilute with water to 100 ml.
4.18 Iron(III) sulfate solution, 100 g/l.

Dissolve 100 g of iron(II) sulfate heptahydrate (FeSO⋅7H O) in 1 l of sulfuric acid (1 + 19).

4 2
4.19 Water, free of CO .

Heat distilled or deionized water to boiling point in a conical flask for 5 min to expel carbon dioxide. Cool,

protecting the water in an appropriate way against any pickup of carbon dioxide.

4.20 Sodium hydroxide, standard volumetric solution, c(NaOH) = 0,2 mol/l approximately.

Dissolve 8 g of sodium hydroxide in 1 l of freshly boiled and cooled water (4.19). Standardize this solution

using either amidosulfuric acid (sulfamic acid) or potassium hydrogen phthalate.

Dry either potassium hydrogen phthalate or sulfamic acid at 105 °C for 1 h and weigh, to the nearest 0,001 g,

either approximately 1 g of potassium hydrogen phthalate or approximately 0,5 g of sulfamic acid. Dissolve

either material in 50 ml of water free of CO (4.19) and titrate with sodium hydroxide solution (4.20) using

phenolphthalein solution (4.22) as indicator.

4.21 Nitric acid, standard volumetric solution c(HNO ) = 0,2 mol/l approximately.

Dilute 13 ml of nitric acid (4.5) with water, to 1 l.

Standardize the solution as follows: accurately measure 25 ml of sodium hydroxide standard volumetric

solution (4.20) and titrate with nitric acid solution, using phenolphthalein solution (4.22) as indicator.

4.22 3,3-Bis(4-hydroxyphenyl)phthalide (phenolphthalein) solution, 0,1 g/100 ml.

Dissolve 0,10 g of powdered phenolphthalein in 90 ml of ethanol, 95 % (V/V), and dilute with water, to 100 ml.

5 Apparatus

Ordinary laboratory apparatus, including one-mark pipettes and one-mark volumetric flasks in accordance with

ISO 648 and ISO 1042.
6 Sampling and samples
6.1 Laboratory sample

For analysis, use a laboratory sample of − 100 µm particle size which has been taken and prepared in

accordance with ISO 3082. In the case of ores having significant contents of combined water or oxidizable

compounds, use a particle size of − 160 µm.

NOTE A guideline on significant contents of combined water and oxidizable compounds is incorporated in ISO 7764.

© ISO 2003 — All rights reserved 3
---------------------- Page: 7 ----------------------
ISO 2599:2003(E)
6.2 Preparation of predried test samples

Thoroughly mix the laboratory sample and, taking multiple increments, extract a test sample in such a manner

that it is representative of the whole contents of the container. Dry the test sample at 105 °C ± 2 °C as

specified in ISO 7764. (This is the predried test sample.)
7 Procedure
7.1 Number of determinations

Carry out the analysis at least in duplicate in accordance with the flowsheet in Annex A, independently, on one

predried test sample.

NOTE The expression “independently” means that the second and any subsequent result is not affected by the

previous result(s). For this particular analytical method, this condition implies that the repetition of the procedure be carried

out either by the same operator at a different time or by a different operator including, in either case, appropriate

recalibration.
7.2 Test portion

Taking several increments, weigh, to the nearest 0,000 2 g, the amount of the predried test sample (6.2)

specified in Table 1.

NOTE The test portion should be taken and weighed quickly, in order to avoid reabsorption of moisture.

Table 1 — Mass of test portion
Phosphorus Mass of test Volume of aliquot Volume of ammonium
content portion portion molybdate solution (4.16)
% g ml ml
0,1 to 0,5 1,0 total 50
0,5 to 2,5 0,5 total 100
2,5 to 5,0 0,5 100/250 100
7.3 Blank test and check test

In each run, one blank test and one analysis of a certified material of the same type of ore shall be carried out

in parallel with the analysis of the ore sample(s) under the same conditions. A predried test sample of the

certified reference material shall be prepared as specified in 6.2.

NOTE The certified reference material should be of the same type as the sample to be analysed and the properties

of the two materials should be sufficiently similar to ensure that in either case no significant changes in the analytical

procedure would become necessary. Where a certified reference material is not available, a reference material may be

used (see 8.2.4).

Where the analysis is carried out on several samples at the same time, the blank value may be represented

...

SLOVENSKI STANDARD
SIST ISO 2599:2005
01-november-2005
äHOH]RYHUXGH±'RORþHYDQMHIRVIRUMD±7LWULPHWULMVNDPHWRGD
Iron ores -- Determination of phosphorus content -- Titrimetric method
Minerais de fer -- Dosage du phosphore -- Méthode titrimétrique
Ta slovenski standard je istoveten z: ISO 2599:2003
ICS:
73.060.10 Železove rude Iron ores
SIST ISO 2599:2005 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST ISO 2599:2005
---------------------- Page: 2 ----------------------
SIST ISO 2599:2005
INTERNATIONAL ISO
STANDARD 2599
Third edition
2003-02-15
Iron ores — Determination of phosphorus
content — Titrimetric method
Minerais de fer — Dosage du phosphore — Méthode titrimétrique
Reference number
ISO 2599:2003(E)
ISO 2003
---------------------- Page: 3 ----------------------
SIST ISO 2599:2005
ISO 2599:2003(E)
PDF disclaimer

This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but

shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In

downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat

accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.

Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation

parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In

the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.

© ISO 2003

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,

electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or

ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2003 — All rights reserved
---------------------- Page: 4 ----------------------
SIST ISO 2599:2005
ISO 2599:2003(E)
Contents Page

Foreword............................................................................................................................................................ iv

1 Scope...................................................................................................................................................... 1

2 Normative references ........................................................................................................................... 1

3 Principle ................................................................................................................................................. 1

4 Reagents ................................................................................................................................................ 2

5 Apparatus............................................................................................................................................... 3

6 Sampling and samples ......................................................................................................................... 3

6.1 Laboratory sample................................................................................................................................ 3

6.2 Preparation of predried test samples ................................................................................................. 4

7 Procedure............................................................................................................................................... 4

7.1 Number of determinations ................................................................................................................... 4

7.2 Test portion ........................................................................................................................................... 4

7.3 Blank test and check test..................................................................................................................... 4

7.4 Determination ........................................................................................................................................ 5

8 Expression of results............................................................................................................................ 7

8.1 Calculation of phosphorus content .................................................................................................... 7

8.2 General treatment of results ................................................................................................................ 7

8.3 Oxide factor ........................................................................................................................................... 9

9 Test report.............................................................................................................................................. 9

Annex A (normative) Flowsheet of the procedure for the acceptance of analytical values for test

samples................................................................................................................................................ 10

Annex B (informative) Derivation of repeatability and permissible tolerance equations ......................... 11

Annex C (informative) Precision data obtained by international analytical trials...................................... 12

© ISO 2003 — All rights reserved iii
---------------------- Page: 5 ----------------------
SIST ISO 2599:2005
ISO 2599:2003(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies

(ISO member bodies). The work of preparing International Standards is normally carried out through ISO

technical committees. Each member body interested in a subject for which a technical committee has been

established has the right to be represented on that committee. International organizations, governmental and

non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the

International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards

adopted by the technical committees are circulated to the member bodies for voting. Publication as an

International Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 2599 was prepared by Technical Committee ISO/TC 102, Iron ore and direct reduced iron, Subcommittee

SC 2, Chemical analysis.

This third edition cancels and replaces the second edition (ISO 2599:1983), which has been editorially revised.

iv © ISO 2003 — All rights reserved
---------------------- Page: 6 ----------------------
SIST ISO 2599:2005
INTERNATIONAL STANDARD ISO 2599:2003(E)
Iron ores — Determination of phosphorus content — Titrimetric
method

WARNING — This International Standard may involve hazardous materials, operations and equipment.

This International Standard does not purport to address all of the safety problems associated with its

use. It is the responsibility of the user of this International Standard to establish appropriate health

and safety practices and determine the applicability of regulatory limitations prior to use.

1 Scope

This International Standard specifies a titrimetric method for the determination of the phosphorus content of

iron ores, using hexaammonium heptamolybdate (ammonium molybdate).

This method is applicable to a concentration range of 0,10 % (m/m) to 5,0 % (m/m) of phosphorus in natural

iron ores, and iron ore concentrates and agglomerates including sinter products.

This International Standard provides a quality control method for the determination of phosphorus by titration,

however, the method cannot be used for referee purposes.
2 Normative references

The following referenced documents are indispensable for the application of this document. For dated

references, only the edition cited applies. For undated references, the latest edition of the referenced

document (including any amendments) applies.
ISO 648:1977, Laboratory glassware — One-mark pipettes
ISO 1042:1998, Laboratory glassware — One-mark volumetric flasks
ISO 3082:2000, Iron ores — Sampling and sample preparation procedures

ISO 3696:1987, Water for analytical laboratory use — Specification and test methods

ISO 7764:1985, Iron ores — Preparation of predried test samples for chemical analysis

3 Principle

The test portion is decomposed by treatment with hydrochloric, nitric and perchloric acids. The insoluble

residue is filtered and the filtrate is reserved as the main solution.

The residue is ignited, treated with sulfuric and hydrofluoric acids to remove silicon dioxide, fused with sodium

carbonate and the melt is leached with water. The alkaline solution is filtered and the residue is discarded.

1) This method has been tested internationally on samples containing phosphorus contents ranging from 0,03 % (m/m) to

1,50 % (m/m).
© ISO 2003 — All rights reserved 1
---------------------- Page: 7 ----------------------
SIST ISO 2599:2005
ISO 2599:2003(E)

The filtrate from residue treatment is acidified using hydrochloric acid, iron(III) chloride is added and the

phosphorus is collected by precipitation with ammonia solution. The precipitate is dissolved in hydrochloric

acid and combined with the main solution. Hydrobromic acid is added and evaporated to fumes of perchloric

acid to expel arsenic. The salts are dissolved in water and the solution, or an aliquot, is neutralized with

ammonia solution and the acidity is adjusted using nitric acid. The solution is cooled to 20 °C and vanadium is

reduced by iron(II) sulfate. Ammonium molybdate is added to the cold solution and the yellow precipitate of

ammonium molybdophosphate is collected by filtration.

The precipitate is washed free of acid and dissolved in a slight excess of sodium hydroxide, the excess being

titrated with nitric acid.

For test portions containing more than 18 mg of titanium, a modified procedure is used (see 7.4.1.2).

4 Reagents

During the analysis, use only reagents of recognized analytical grade, and only water that conforms to grade 2

of ISO 3696:1987.
4.1 Ammonium nitrate (NH NO ).
4 3
4.2 Sodium carbonate (Na CO ), anhydrous.
2 3
4.3 Hydrochloric acid, ρ 1,16 g/ml to 1,19 g/ml
4.4 Hydrochloric acid, ρ 1,16 g/ml to 1,19 g/ml diluted 1 + 1.
4.5 Nitric acid, ρ 1,42 g/ml.
4.6 Nitric acid, ρ 1,42 g/ml diluted 1 + 50.
4.7 Nitric acid, ρ 1,42 g/ml diluted 1 + 5 000.
4.8 Sulfuric acid, ρ 1,84 g/ml.
4.9 Sulfuric acid, ρ 1,84 g/ml diluted 1 + 1.

4.10 Perchloric acid, ρ 1,54 g/ml, 60 % (m/m) solution, or ρ 1,67 g/ml, 70 % (m/m) solution.

4.11 Hydrofluoric acid, ρ 1,13 g/ml, 40 % (m/m) solution.

4.12 Hydrobromic acid, ρ 1,38 g/ml, 40 % (m/m) solution or ρ 1,48 g/ml, 47 % (m/m) solution.

4.13 Ammonia solution, ρ 0,9 g/ml.
4.14 Hydrogen peroxide, 30 % (m/m) solution, free from phosphate stabilizer.
4.15 Potassium nitrate, 10 g/l solution.
4.16 Ammonium molybdate, solution.

Dissolve 40 g of finely pulverized crystalline ammonium molybdate tetrahydrate [(NH ) Mo O ⋅4H O] in

4 6 7 24 2

300 ml of warm water and 80 ml of ammonia solution (4.13). Allow the solution to cool and add this solution in

small portions to 600 ml of nitric acid (1 + 1), while stirring. Add a few milligrams of sodium hydrogen

phosphate or ammonium hydrogen phosphate and allow to stand for at least 2 d. Filter before use.

2 © ISO 2003 — All rights reserved
---------------------- Page: 8 ----------------------
SIST ISO 2599:2005
ISO 2599:2003(E)
4.17 Iron(III) chloride solution, containing 3 g of Fe/l.

Dissolve 0,3 g of pure iron, with as small a content of phosphorus as possible, by treatment with hydrochloric

acid (4.3), add a few drops of nitric acid (4.5) to oxidize the iron, and boil the mixture to remove chlorine.

Allow the solution to cool and dilute with water to 100 ml.
4.18 Iron(III) sulfate solution, 100 g/l.

Dissolve 100 g of iron(II) sulfate heptahydrate (FeSO⋅7H O) in 1 l of sulfuric acid (1 + 19).

4 2
4.19 Water, free of CO .

Heat distilled or deionized water to boiling point in a conical flask for 5 min to expel carbon dioxide. Cool,

protecting the water in an appropriate way against any pickup of carbon dioxide.

4.20 Sodium hydroxide, standard volumetric solution, c(NaOH) = 0,2 mol/l approximately.

Dissolve 8 g of sodium hydroxide in 1 l of freshly boiled and cooled water (4.19). Standardize this solution

using either amidosulfuric acid (sulfamic acid) or potassium hydrogen phthalate.

Dry either potassium hydrogen phthalate or sulfamic acid at 105 °C for 1 h and weigh, to the nearest 0,001 g,

either approximately 1 g of potassium hydrogen phthalate or approximately 0,5 g of sulfamic acid. Dissolve

either material in 50 ml of water free of CO (4.19) and titrate with sodium hydroxide solution (4.20) using

phenolphthalein solution (4.22) as indicator.

4.21 Nitric acid, standard volumetric solution c(HNO ) = 0,2 mol/l approximately.

Dilute 13 ml of nitric acid (4.5) with water, to 1 l.

Standardize the solution as follows: accurately measure 25 ml of sodium hydroxide standard volumetric

solution (4.20) and titrate with nitric acid solution, using phenolphthalein solution (4.22) as indicator.

4.22 3,3-Bis(4-hydroxyphenyl)phthalide (phenolphthalein) solution, 0,1 g/100 ml.

Dissolve 0,10 g of powdered phenolphthalein in 90 ml of ethanol, 95 % (V/V), and dilute with water, to 100 ml.

5 Apparatus

Ordinary laboratory apparatus, including one-mark pipettes and one-mark volumetric flasks in accordance with

ISO 648 and ISO 1042.
6 Sampling and samples
6.1 Laboratory sample

For analysis, use a laboratory sample of − 100 µm particle size which has been taken and prepared in

accordance with ISO 3082. In the case of ores having significant contents of combined water or oxidizable

compounds, use a particle size of − 160 µm.

NOTE A guideline on significant contents of combined water and oxidizable compounds is incorporated in ISO 7764.

© ISO 2003 — All rights reserved 3
---------------------- Page: 9 ----------------------
SIST ISO 2599:2005
ISO 2599:2003(E)
6.2 Preparation of predried test samples

Thoroughly mix the laboratory sample and, taking multiple increments, extract a test sample in such a manner

that it is representative of the whole contents of the container. Dry the test sample at 105 °C ± 2 °C as

specified in ISO 7764. (This is the predried test sample.)
7 Procedure
7.1 Number of determinations

Carry out the analysis at least in duplicate in accordance with the flowsheet in Annex A, independently, on one

predried test sample.

NOTE The expression “independently” means that the second and any subsequent result is not affected by the

previous result(s). For this particular analytical method, this condition implies that the repetition of the procedure be carried

out either by the same operator at a different time or by a different operator including, in either case, appropriate

recalibration.
7.2 Test portion

Taking several increments, weigh, to the nearest 0,000 2 g, the amount of the predried test sample (6.2)

specified in Table 1.

NOTE The test portion should be taken and weighed quickly, in order to avoid reabsorption of moisture.

Table 1 — Mass of test portion
Phosphorus Mass of test Volume of aliquot Volume of ammonium
content portion portion molybdate solution (4.16)
% g ml ml
0,1 to 0,5 1,0 total 50
0,5 to 2,5 0,5 total 100
2,5 to 5,0 0,5 100/250 100
7.3 Blank test and check test

In each run, one blank test and one analysis of a certified material of the same type of ore shall be carried out

in parallel with the analysis of the ore sample(s) under the same conditions. A predried test sample of the

certified reference material shall be prepared as specified in 6.2.

NOTE The certified reference material should be of the same type as the sample to be analysed and th

...

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