GB/T 223.91-2021 English PDF

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GB/T 223.91-2021: Iron, steel and alloy - Determination of copper - 2, 2′-Biquinoline spectrophotometric method
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 223.91-2021	264	Add to Cart	3 days	Iron, steel and alloy - Determination of copper - 2, 2′-Biquinoline spectrophotometric method	Valid

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Basic data

Standard ID: GB/T 223.91-2021 (GB/T223.91-2021)
Description (Translated English): Iron, steel and alloy - Determination of copper - 2, 2��-Biquinoline spectrophotometric method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H11
Word Count Estimation: 14,197
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 223.91-2021: Iron, steel and alloy - Determination of copper - 2, 2′-Biquinoline spectrophotometric method

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Iron, steel and alloy - Determination of copper - 2, 2′-Biquinoline spectrophotometric method ICS 77.080.01 CCSH11 National Standards of People's Republic of China Determination of copper content in steel and alloys 2,2'-Biquinoline Spectrophotometry (ISO 4946.2016, Steelandcastiron-Determinationofcopper- Released on 2021-08-20 2022-03-01 implementation State Administration of Market Supervision and Administration Issued by the National Standardization Management Committee

Table of contents

Foreword Ⅲ 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 Principle 1 5 Reagent 1 6 Instruments and equipment 2 7 Take sample 2 8 Analysis step 2 8.1 Sample 2 8.2 Blank test 2 8.3 Determination 2 8.3.1 Preparation of test solution 2 8.3.2 Color rendering 3 8.3.3 Preparation of reference solution 3 8.3.4 Spectrophotometric measurement 3 8.4 Establishment of calibration curve 3 8.4.1 Preparation of calibration solution 3 8.4.2 Spectrophotometric measurement 4 8.4.3 Calibration curve 4 9 Result expression 4 10 Precision 4 10.1 Overview 4 10.2 Repeatability 5 10.3 Reproducibility 5 11 Test report 5 Appendix A (informative) Additional information on international inter-laboratory tests 6 Appendix B (Informative) Precision Data Graphic 7 Reference 8

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents" Drafting. The translation method used in this document is equivalent to ISO 4946.2016 "Determination of Copper Content in Steel and Cast Iron 2,2'-Biquinoline Spectrophotometry". A chapter "Terms and Definitions" has been added to this document. The Chinese documents that have consistent correspondence with the normatively cited international documents in this document are as follows. ---GB/T 6682-2008 Analytical laboratory water specifications and test methods (ISO 3696.1987, MOD) ---GB/T 12806-2011 Laboratory glassware single mark volumetric flask (ISO 1042.1998, NEQ) ---GB/T 20066-2006 Sampling and sample preparation methods for the determination of the chemical composition of steel and iron (ISO 14284.1996, IDT) The following editorial changes have been made to this document. ---In order to be consistent with the existing series of standards, the standard name is changed to "Determination of Copper Content in Steel and Alloy 2,2'-Biquinoline Spectroscopy Degree of Law. This document was proposed by the China Iron and Steel Association. This document is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183). Drafting organizations of this document. IRON & NAC Testing Technology Co., Ltd., Central Iron and Steel Research Institute, Hengyang Valin Steel Pipe Co., Ltd. The main drafters of this document. Tang Benling, Li Zhipeng, Luo Qianhua, Tang Fang. Determination of copper content in steel and alloys 2,2'-Biquinoline Spectrophotometry

1 Scope

This document specifies the 2,2'-biquinoline spectrophotometric method for the determination of copper content in steel and cast iron. This document is applicable to the determination of copper content with a mass fraction of 0.02% to 5%.

2 Normative references

The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to This document. ISO 648 Laboratory glassware-Single-volumepipettes ISO 1042 Laboratory glassware-One-mark volumetric flask flasks) ISO 3696 Analytical laboratory water specifications and test methods (Waterforanalyticallaboratoryuse-Specification andtestmethods) ISO 14284 Sampling and sample preparation methods for the determination of the chemical composition of steel and iron (Steelandiron-Samplingand preparationofsamplesforthedeterminationofchemicalcomposition)

3 Terms and definitions

There are no terms and definitions that need to be defined in this document.

4 Principle

The sample is decomposed with a suitable acid. Take perchloric acid fumes to remove hydrochloric acid and nitric acid, and dehydrate silicic acid. In an acidic solution, use ascorbic acid to Cu2 is reduced to Cu, and Cu forms a colored compound with 2,2'-biquinoline. Spectrophotometric measurement was performed at a wavelength of 545nm.

5 Reagents

Unless otherwise stated, only use the secondary water identified as analytically pure reagents and ISO 3696 in the analysis. 5.1 High-purity iron, the mass fraction of copper is not more than 0.001%. 5.2 Hydrochloric acid, ρ is about 1.19g/mL. 5.3 Nitric acid, ρ is about 1.40g/mL. 5.4 Perchloric acid, ρ is about 1.54g/mL. Warning---Usually in the presence of ammonia, nitrous fumes or organic substances, perchloric acid vapor may cause an explosion. Perchloric acid with a ρ of about 1.67 g/mL can also be used. 100mLρ about 1.54g/mL perchloric acid is equivalent to 79mLρ about 1.67g/mL perchloric acid. ......

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