ASTM E1615-22

Standard Test Method for Determination of Trace Quantities of Iron by Visible Spectrophotometry

SIGNIFICANCE AND USE
4.1 This test method is suitable for determining trace concentrations of iron in a wide variety of products, provided that appropriate sample preparation has rendered the iron and sample matrix soluble in water or other suitable solvent. Each sample matrix must be investigated for suitability using this test method.  
4.2 This test method assumes that the amount of color developed is proportional to the amount of iron in the test solution. The calibration curve is linear over the specified range.
SCOPE
1.1 This test method covers the determination of iron in aromatic hydrocarbons, their derivatives, and related chemicals in the range from 0.01 to 0.2 μg/g using [3-(2-pyridyl)-5,6-bis(4-phenylsulfonic acid)-1,2,4-triazine, monosodium salt, monohydrate] (PDTS)2 reagent solution. The range may be extended through the use of a 5- or 10-cm cell or by suitable dilution of the sample solution.  
1.2 The limit of detection (LOD) is 0.01 µg/kg for iron and the limit of quantitation (LOQ) is 0.04 µg/kg.
Note 1: The LOD and LOQ were calculated using data from the ILS.  
1.3 This test method is intended to be general for the final steps in the determination of iron and does not include procedures for sample preparation.  
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.5 Review the current Safety Data Sheets (SDS) for detailed information concerning toxicity, first-aid procedures, and safety precautions.  
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific warning statements, see Section 8.  
1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 30-Apr-2022
• ICS: 77.120.99 - Other non-ferrous metals and their alloys
• Technical Committee: D16 - Aromatic, Industrial, Specialty and Related Chemicals
• Drafting Committee: D16.04 - Instrumental Analysis

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: E1615 − 22
Standard Test Method for
Determination of Trace Quantities of Iron by Visible
1
Spectrophotometry
This standard is issued under the fixed designation E1615; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 2. Referenced Documents
3
1.1 This test method covers the determination of iron in 2.1 ASTM Standards:
aromatichydrocarbons,theirderivatives,andrelatedchemicals D1193 Specification for Reagent Water
in the range from 0.01 to 0.2 µg/g using [3-(2-pyridyl)-5,6- D6143 Test Method for Iron Content of Bisphenol A (4,4' -
bis(4-phenylsulfonic acid)-1,2,4-triazine, monosodium salt, Isopropylidenediphenol)
2
monohydrate] (PDTS) reagent solution. The range may be D6809 Guide for Quality Control and Quality Assurance
extended through the use of a 5- or 10-cm cell or by suitable Procedures for Aromatic Hydrocarbons and Related Ma-
dilution of the sample solution. terials
E60 Practice for Analysis of Metals, Ores, and Related
1.2 The limit of detection (LOD) is 0.01 µg/kg for iron and
Materials by Spectrophotometry
the limit of quantitation (LOQ) is 0.04 µg/kg.
E180 Practice for Determining the Precision of ASTM
NOTE 1—The LOD and LOQ were calculated using data from the ILS.
Methods for Analysis and Testing of Industrial and Spe-
4
1.3 This test method is intended to be general for the final cialty Chemicals (Withdrawn 2009)
E200 Practice for Preparation, Standardization, and Storage
steps in the determination of iron and does not include
procedures for sample preparation. of Standard and Reagent Solutions for ChemicalAnalysis
E275 Practice for Describing and Measuring Performance of
1.4 The values stated in SI units are to be regarded as
Ultraviolet and Visible Spectrophotometers
standard. No other units of measurement are included in this
standard.
3. Summary of Test Method
1.5 Review the current Safety Data Sheets (SDS) for de-
3.1 Certain molecules like PDTS which contains the ferroin
tailedinformationconcerningtoxicity,first-aidprocedures,and
group -N=C-C=N- react as a bidentate ligands with ferrous
safety precautions.
metal ions forming a colored complex species.
1.6 This standard does not purport to address all of the
3.2 This test method is based upon a photometric determi-
safety concerns, if any, associated with its use. It is the
2,5
nation of the ferroin PDTS complex with the iron (II) ion.
responsibility of the user of this standard to establish appro-
The sample is dissolved in a suitable solvent, any ferric iron is
priate safety, health, and environmental practices and deter-
reduced to ferrous iron when the iron is reacted with PDTS
mine the applicability of regulatory limitations prior to use.
reagent solution which will also convert the dissolved iron
For specific warning statements, see Section 8.
compoundstoformamagentacoloriron(II)complex.Theiron
1.7 This international standard was developed in accor-
content of the sample solution is determined by measurement
dance with internationally recognized principles on standard-
of the magenta color at 560 nm using a suitable photometer.
ization established in the Decision on Principles for the
3.3 Quantitation of the iron content in the sample is accom-
Development of International Standards, Guides and Recom-
plished by measuring the intensity of the color produced by the
mendations issued by the World Trade Organization Technical
magenta complex described above. The Beer-Lambert law is
Barriers to Trade (TBT) Committee.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
1
This test method is under the jurisdiction of ASTM Committee D16 on contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Aromatic, Industrial, Specialty and Related Chemicals and is the direct responsi- Standards volume information, refer to the standard’s Document Summary page on
bility of Subcommittee D16.04 on Instrumental Analysis. the ASTM website.
4
Current edition approved May 1, 2022. Published June 2022. Originally The last approved version of this historical standard is referenced on
approved in 1994. Last previous edition approved in 2016 as E1615 – 16. DOI: www.astm.org.
5
10.1520/E1615-22. Gibbs, C. R., “Characterization and Application of FerroZine Iron Reagent as
2
Stookey, L. L., “FerroZine—A New Spectrophotometric Reagent for Iron,” a Ferrous Iron Indicator,” Analytical Chemistry, Vol 48, No. 8, July 1976, pp.
Analytical Chemistry,
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: E1615 − 16 E1615 − 22
Standard Test Method for
Iron inDetermination of Trace Quantities Using the
1
FerroZine Methodof Iron by Visible Spectrophotometry
This standard is issued under the fixed designation E1615; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope*
1.1 This test method covers the determination of iron in aromatic hydrocarbons, their derivatives, and related chemicals in the
range from 0.01 to 0.2 μg/g using FerroZine[3-(2-pyridyl)-5,6-bis(4-phenylsulfonic acid)-1,2,4-triazine, monosodium salt,
2
monohydrate] (PDTS) reagent solution. The range may be extended through the use of a 5- or 10-cm cell or by suitable dilution
of the sample solution.
1.2 The limit of detection (LOD) is 0.01 μg/kg for iron and the limit of quantitation (LOQ) is 0.04 μg/kg.
NOTE 1—The LOD and LOQ were calculated using data from the ILS.
1.3 This test method is intended to be general for the final steps in the determination of iron and does not include procedures for
sample preparation.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 Review the current Safety Data Sheets (SDS) for detailed information concerning toxicity, first-aid procedures, and safety
precautions.
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of
regulatory limitations prior to use. For specific warning statements, see Section 7.48.
1.7 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
3
2.1 ASTM Standards:
D1193 Specification for Reagent Water
1
This test method is under the jurisdiction of ASTM Committee D16 on Aromatic, Industrial, Specialty and Related Chemicals and is the direct responsibility of
Subcommittee D16.04 on Instrumental Analysis.
Current edition approved April 1, 2016May 1, 2022. Published May 2016June 2022. Originally approved in 1994. Last previous edition approved in 20082016 as E1615–
08. – 16. DOI: 10.1520/E1615-16.10.1520/E1615-22.
2
FerroZine is a trademark of Hach Chemical Company.Stookey, L. L., “FerroZine—A New Spectrophotometric Reagent for Iron,” Analytical Chemistry, Vol 42, No. 7,
June 1970, pp. 779 – 781.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
E1615 − 22
D6143 Test Method for Iron Content of Bisphenol A (4,4' - Isopropylidenediphenol)
D6809 Guide for Quality Control and Quality Assurance Procedures for Aromatic Hydrocarbons and Related Materials
E60 Practice for Analysis of Metals, Ores, and Related Materials by Spectrophotometry
E180 Practice for Determining the Precision of ASTM Methods for Analysis and Testing of Industrial and Specialty Chemicals
4
(Withdrawn 2009)
E200 Practice for Preparation, Standardization, and Storage of Standard and Reagent Solutions for Chemical Analysis
E275 Practice for Describing and Measuring Performance of Ultraviolet and Visible Spectrophotometers
3. Summary of Test Method
3.1 Certain molecules like PDTS which contains the ferroin group -N=C-C=N- react as a bidentate ligands with ferrous metal ions
forming a colored complex species.
2,5
3.2 This test method is based upon a photometric determination of the FerroZineferroin PDTS complex with the iron (II) ion.
The sample is dissolved in a suitable solvent and solvent, any ferric iron is reduced to ferrous iron when the iron is reacted with
FerroZinePDTS reagent solution which will also convert the dissolved iron compoun
...