ISO 23156:2021
(Main)Ferronickels — Determination of phosphorus, manganese, chromium, copper and cobalt contents — Inductively coupled plasma optical emission spectrometric method
Ferronickels — Determination of phosphorus, manganese, chromium, copper and cobalt contents — Inductively coupled plasma optical emission spectrometric method
This document specifies a method for the determination of phosphorus, manganese, chromium, copper and cobalt contents in ferronickels, by inductively coupled plasma (ICP) optical emission spectrometry, within the ranges specified in Table 1. This method is applicable to all grades of ferronickels specified in ISO 6501.
Ferro-nickels — Détermination du phosphore, du manganèse, du chrome, du cuivre et du cobalt — Méthode par spectrométrie d'émission optique avec plasma induit par haute fréquence
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INTERNATIONAL ISO
STANDARD 23156
First edition
2021-03
Ferronickels — Determination of
phosphorus, manganese, chromium,
copper and cobalt contents —
Inductively coupled plasma optical
emission spectrometric method
Ferro-nickels — Détermination du phosphore, du manganèse,
du chrome, du cuivre et du cobalt — Méthode par spectrométrie
d'émission optique avec plasma induit par haute fréquence
Reference number
©
ISO 2021
© ISO 2021
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ii © ISO 2021 – All rights reserved
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Reagents . 2
6 Apparatus . 4
6.1 General . 4
6.2 Instrument performance requirements . 4
6.2.1 Wavelengths . 4
6.2.2 Practical resolution of the spectrometer . 5
6.2.3 Short-term stability . 5
6.2.4 Background equivalent concentration . 5
6.2.5 Linearity of the calibration curves . 5
7 Sampling and sample preparation . 5
8 Procedure. 5
8.1 Test portion . 5
8.2 Preparation of the test solution . 6
8.3 Preparation of the calibration solutions . 6
8.4 Optimization of the instrument . 7
8.5 Measurements . 7
8.5.1 Measurement of the calibration solutions . 7
8.5.2 Measurement of the test solutions . 8
8.6 Calibration curves . 8
9 Expression of the results . 8
9.1 Calculation of results . 8
9.2 Precision . 8
9.2.1 Interlaboratory test . 8
9.2.2 Precision data . 8
9.3 Trueness .10
10 Test report .12
Annex A (normative) Checking the performance of an inductively coupled plasma optical
emission spectrometer .13
Annex B (informative) Notes on the interlaboratory test .15
Bibliography .16
Foreword
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This document was prepared by Technical Committee ISO/TC 155, Nickel and nickel alloys.
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iv © ISO 2021 – All rights reserved
INTERNATIONAL STANDARD ISO 23156:2021(E)
Ferronickels — Determination of phosphorus, manganese,
chromium, copper and cobalt contents — Inductively
coupled plasma optical emission spectrometric method
1 Scope
This document specifies a method for the determination of phosphorus, manganese, chromium, copper
and cobalt contents in ferronickels, by inductively coupled plasma (ICP) optical emission spectrometry,
within the ranges specified in Table 1.
This method is applicable to all grades of ferronickels specified in ISO 6501.
Table 1 — Application ranges of the elements to be determined
Application range
Element
% (mass fraction)
Phosphorus 0,009 to 0,045
Manganese 0,02 to 1,0
Chromium 0,076 to 1,86
Cobalt 0,24 to 1,4
Copper 0,02 to 0,07
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 385, Laboratory glassware — Burettes
ISO 648, Laboratory glassware — Single-volume pipettes
ISO 1042, Laboratory glassware — One-mark volumetric flasks
ISO 3696, Water for analytical laboratory use — Specification and test methods
ISO 8049, Ferronickel shot — Sampling for analysis
ISO 8050, Ferronickel ingots or pieces — Sampling for analysis
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 Principle
Dissolution of a test portion with nitric, hydrochloric and hydrofluoric acids. Addition of perchloric
acid to remove fluorine and silicon. Addition of nitric and hydrochloric acids to dissolve the salts. After
suitable dilution and, if necessary, addition of an internal reference element, nebulization of the solution
into an ICP optical emission spectrometer and measurement of the intensity of the emitted light from
each element (including, where relevant, the intensity of the internal reference element).
5 Reagents
During the analysis, unless otherwise stated, use only reagents of recognized analytical grade and only
Grade 2 water as specified in ISO 3696.
The same reagents should be used for the preparation of calibration solutions and of sample solutions.
5.1 Pure nickel, containing less than 0,001 % (mass fraction) of P, Mn, Cr, Cu and Co.
5.2 Pure iron, containing less than 0,001 % (mass fraction) of P, Mn, Cr, Cu and Co.
5.3 Hydrochloric acid, HCl, ρ = 1,19 g/ml.
5.4 Nitric acid, HNO , ρ = 1,40 g/ml.
3 20
5.5 Nitric acid, HNO , diluted 1 + 1.
Add 500 ml of nitric acid (5.4) to 500 ml of water and mix.
5.6 Hydrofluoric acid, HF, ρ = 1,14 g/ml.
WARNING — Hydrofluoric acid is extremely irritating and corrosive to skin and mucous
membranes producing severe skin burns which are slow to heal. In case of contact with skin,
wash well with water, apply a topical gel containing 2,5 % (mass fraction) calcium gluconate and
seek immediate medical treatment.
5.7 Perchloric acid, HClO , ρ = 1,54 g/ml.
4 20
WARNING — Perchloric acid vapour may cause explosion in the presence of ammonia, nitrous
fume or organic matter in general. All evaporation shall be carried out in fume hood specifically
designed for the use of perchloric acid.
5.8 Sulfuric acid, H SO , ρ = 1,84 g/ml.
2 4 20
5.9 Internal reference element solution, 1 g/l.
Weigh (1,27 ± 0,001) g of yttrium oxide [minimum purity 99,98 % (mass fraction)] and dissolve in 50 ml
of hydrochloric acid (5.3). Transfer the solution quantitatively into a 1 000 ml one-mark volumetric
flask, dilute to the mark with water and mix.
1 ml of this internal reference element solution contains 1 mg of yttrium.
NOTE Commercially available standard solutions are also used for this purpose.
5.10 Internal reference element solution, 10 mg/l.
Transfer 10,0 ml of the internal reference element solution (5.9) into a 1 000 ml one-mark volumetric
flask, add 50 ml of hydrochloric acid (5.3), dilute to the volume with water and mix.
2 © ISO 2021 – All rights reserved
1 ml of this internal reference element s
...
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