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GB/T 4702.2-2025: Chromium metal - Determination of silicon content - Perchloric acid gravimetric method and molybdenum blue spectrophotometric method
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Std ID	Version	USD	Buy	Deliver [PDF] in	Title (Description)
GB/T 4702.2-2025	English	319	Add to Cart	3 days [Need to translate]	Chromium metal - Determination of silicon content - Perchloric acid gravimetric method and molybdenum blue spectrophotometric method
GB/T 4702.2-2008	English	149	Add to Cart	2 days [Need to translate]	Chromium metal -- Determination of silicon content -- The perchloric acid gravimetric method
GB/T 4702.2-1984	English	199	Add to Cart	2 days [Need to translate]	Methods for chemical analysis of chromium metal--The perchloric acid dehydration-gravimetric method for the determination of silicon content

GB/T 4702.2-2025: Chromium metal - Determination of silicon content - Perchloric acid gravimetric method and molybdenum blue spectrophotometric method

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ICS 77.100 CCSH11 National Standards of the People's Republic of China Replaces GB/T 4702.2-2008 Determination of Chromium and Silicon Content by Perchloric Acid Dehydration Gravimetric method and molybdenum blue spectrophotometry Published on 2025-10-31 Implemented on May 1, 2026 State Administration for Market Regulation The State Administration for Standardization issued a statement.

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents". Drafting. This document is Part 2 of GB/T 4702.GB/T 4702 has been published in the following 16 parts. ---Determination of Chromium Content by Ferrous Ammonium Sulfate Titration Method (GB/T 4702.1); ---Determination of Chromium and Silicon Content by Perchloric Acid Dehydration Gravimetric Method and Molybdenum Blue Spectrophotometric Method (GB/T 4702.2); ---Determination of Chromium and Phosphorus Content. Bismuth-phosphorus-molybdenum blue spectrophotometric method (GB/T 4702.3); ---Determination of chromium and ferrochrome content by disodium ethylenediaminetetraacetate titration and flame atomic absorption spectrometry (GB/T 4702.4); ---Determination of Chromium and Aluminum Content by Disodium Ethylenediaminetetraacetate Titration and Flame Atomic Absorption Spectrometry (GB/T 4702.5); ---Determination of the content of metallic chromium, ferrochrome, aluminum, silicon and copper by inductively coupled plasma atomic emission spectrometry (GB/T 4702.6); ---Determination of Chromium and Nitrogen Content by Distillation Separation - Nessler Reagent Spectrophotometry (GB/T 4702.7); ---Chemical Analysis Methods for Chromium Metals. Determination of Arsenic Content by Distillation-Molybdenum Blue Spectrophotometry (GB/T 4702.8); ---Chemical Analysis Methods for Chromium Metals. Determination of Antimony Content by Crystal Violet Spectrophotometry (GB/T 4702.9); ---Chemical Analysis Methods for Chromium Metals. Determination of Copper Content by Copper Reagent Spectrophotometry (GB/T 4702.10); ---Chemical Analysis Methods for Tin Content Determination by Alizarin Violet Spectrophotometry (GB/T 4702.11) ---Chemical analysis method for chromium metal. Determination of carbon content by infrared absorption method (GB/T 4702.14); ---Determination of the content of metallic chromium, lead, tin, bismuth, antimony and arsenic by inductively coupled plasma mass spectrometry (GB/T 4702.15); ---Determination of Chromium-Sulfur Content by Infrared Absorption Method and Combustion Neutralization Titration Method (GB/T 4702.16); ---Determination of the content of chromium, oxygen, nitrogen, and hydrogen in metallic chromium using inert gas melting infrared absorption and thermal conductivity methods (GB/T 4702.17); ---Determination of Chromium and Vanadium Content by Tantalum Reagent Chloroform Extraction Spectrophotometric Method (GB/T 4702.18). This document replaces GB/T 4702.2-2008 "Determination of Chromium and Silicon Content in Metals - Perchloric Acid Gravimetric Method", and is consistent with GB/T 4702.2- Compared to.2008, aside from structural adjustments and editorial changes, the main technical changes are as follows. a) The measurement range has been changed (see Chapter 1, Chapter 1 of the.2008 edition); b) Reagents and materials have been changed (see 4.2, 3.2 in the.2008 edition); c) Sampling requirements have been changed (see 4.4, 3.4 in the.2008 version); d) The sample size was changed (see 4.5.1, 3.5.1 in the.2008 version); e) The blank test has been modified (see 4.5.2, version 3.5.2 of the.2008 edition); f) The number of measurements was increased (see 4.5.3); g) The sample decomposition procedure has been modified (4.5.4.1, 3.5.3.1 in the.2008 version); h) Added a representation of the results (see 4.7); i) The precision was changed (see 4.8, 3.7 in the.2008 edition); j) A second method has been added. molybdenum blue spectrophotometry (see Chapter 5); k) A flowchart for the experimental analysis results acceptance procedure has been added (see Appendix A). Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents. This document was proposed by the China Iron and Steel Association. This document is under the jurisdiction of the National Technical Committee on Standardization of Pig Iron and Ferroalloys (SAC/TC318). This document was drafted by. CITIC (Liaoning) New Material Technology Co., Ltd., Nantong Pinyan Testing Technology Co., Ltd., and Shuoheng Ruitian. (Qingdao) Technology Co., Ltd., Inner Mongolia Xintaiyuan New Materials Co., Ltd., Ordos Xijin Mining and Metallurgy Co., Ltd., Jilin Iron and Steel Alloy Limited Liability Company, Benxi Steel Plate Co., Ltd., China Certification & Inspection Group Hebei Co., Ltd., Metallurgical Industry Information and Standardization Research Institute. The main drafters of this document are. Wu Lei, Li Yaguang, Wang Liang, Yang Yue, Liu Kun, Wang Xuan, Sun Xiaofei, Wu Zhifeng, Wu Fanghui, Zhang Li, and Wang Yapeng. He Qingchang, Xu Wengao, Wang Hao, Liu Peng, Xu Zhibin, Sun Guihua, Zheng Haidong, Ma Ning, Huang Xin, Wang Jing, Lu Chunsheng, Cheng Zhaoyang. This document was first published in 1984, revised for the first time in.2008, and this is the second revision.

Introduction

Because the detection of chromium metal involves many elements, and the applicable scope and methods for each element differ, in order to ensure... The convenience and accuracy of chromium metal detection documentation, along with our analytical methods for different elements within chromium, have led to the establishment of national standards supporting chromium metal detection. National Document System. GB/T 4702, the series of analytical methods for metallic chromium, is the basic document for the detection of metallic chromium in my country, and is proposed to consist of 16 parts. ---Part 1.Determination of Chromium Content in Metallic Chromium - Ferrous Ammonium Sulfate Titration Method. The purpose is to determine the chromium content in metallic chromium using... Titration with ferrous ammonium sulfate. ---Part 2.Determination of Chromium and Silicon Content in Metals. Perchloric Acid Dehydration Gravimetric Method and Molybdenum Blue Spectrophotometric Method. The purpose is to measure the chromium and silicon content in metals. The silicon content in chromium was determined using the perchloric acid gravimetric method and the molybdenum blue spectrophotometric method. ---Part 3.Determination of Phosphorus Content in Metallic Chromium. Bismuth-phosphorus-molybdenum blue spectrophotometric method. The purpose is to measure the phosphorus content in metallic chromium. The bismuth phosphomolybdenum blue spectrophotometric method was used. ---Part 4.Determination of Ferrochromium Content by Disodium Ethylenediaminetetraacetate Titration and Flame Atomic Absorption Spectrometry. Objective The method for measuring the iron content in metallic chromium is the disodium ethylenediaminetetraacetate titration method and flame atomic absorption spectrometry. ---Part 5.Determination of Chromium and Aluminum Content by Disodium Ethylenediaminetetraacetate Titration and Flame Atomic Absorption Spectrometry. Objective The method for measuring the aluminum content in metallic chromium is the disodium ethylenediaminetetraacetate titration method and the flame atomic absorption spectrometry method. ---Part 6.Determination of Chromium, Ferrochrome, Aluminum, Silicon, and Copper Contents by Inductively Coupled Plasma Atomic Emission Spectrometry. The purpose is to... Inductively coupled plasma atomic emission spectrometry (ICP-AES) was used to measure the iron, aluminum, silicon, and copper content in metallic chromium. ---Part 7.Determination of Nitrogen Content in Metallic Chromium - Distillation Separation-Niesler Reagent Spectrophotometry. The purpose is to measure the nitrogen content of metallic chromium. The nitrogen content was determined by distillation separation-Nessler reagent spectrophotometry. ---Part 8.Chemical Analysis Methods for Metallic Chromium. Determination of Arsenic Content by Distillation-Molybdenum Blue Spectrophotometry. The purpose is to measure the arsenic content in metallic chromium. Arsenic content was determined using the distillation-molybdenum blue spectrophotometric method. ---Part 9.Chemical Analysis Methods for Metallic Chromium. Determination of Antimony by Crystal Violet Spectrophotometry. The purpose is to measure antimony in metallic chromium. The content was determined using crystal violet spectrophotometry. ---Part 10.Chemical Analysis Methods for Metallic Chromium - Determination of Copper Content by Copper Reagent Spectrophotometry. The purpose is to measure copper in metallic chromium. The content was determined using the copper reagent spectrophotometric method. ---Part 11.Chemical Analysis Methods for Metallic Chromium. Determination of Tin Content by Alizarin Violet Spectrophotometry. The purpose is to measure tin content in metallic chromium. The content was determined using alizarin violet spectrophotometry. ---Part 14.Chemical Analysis Methods for Metallic Chromium - Determination of Carbon Content by Infrared Absorption Spectroscopy. The purpose is to measure the carbon content in metallic chromium. The amount was measured using the infrared absorption method. ---Part 15.Determination of Chromium, Lead, Tin, Bismuth, Antimony, and Arsenic Content by Inductively Coupled Plasma Mass Spectrometry. The purpose is to measure the content of chromium, lead, tin, bismuth, antimony, and arsenic in metallic chromium. The content of lead, tin, bismuth, antimony, and arsenic was determined by inductively coupled plasma mass spectrometry. ---Part 16.Determination of Chromium Sulfur Content by Infrared Absorption and Combustion Neutralization Titration. The purpose is to measure the chromium content in metallic chromium. The sulfur content in the sample was determined using infrared absorption and combustion neutralization titration methods. ---Part 17.Determination of the content of chromium, oxygen, nitrogen, and hydrogen in metallic metals using inert gas melting infrared absorption and thermal conductivity methods. The purpose is to measure... The oxygen, nitrogen, and hydrogen content in metallic chromium was measured using inert gas melting infrared absorption and thermal conductivity methods. ---Part 18.Determination of Chromium and Vanadium Content by Tantalum Reagent Chloroform Extraction Spectrophotometry. The purpose is to measure the content of metallic chromium. The vanadium content was determined using the tantalum reagent chloroform extraction spectrophotometric method. Determination of Chromium and Silicon Content by Perchloric Acid Dehydration Gravimetric method and molybdenum blue spectrophotometry Warning---Personnel using this document should have practical experience working in a formal laboratory. This document does not address all possible safety issues. Users are responsible for taking appropriate safety and health measures and ensuring compliance with relevant national regulations.

1 Scope

This document specifies the methods for determining the silicon content in metallic chromium using the perchloric acid dehydration gravimetric method and the molybdenum blue spectrophotometric method. This document applies to the determination of silicon content in metallic chromium. Determination range (mass fraction). 0.10%~2.00% by perchloric acid dehydration gravimetric method; Molybdenum blue spectrophotometry. 0.10%~0.70%.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included. For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies. This document. GB/T 4010 Sample collection and preparation for chemical analysis of ferroalloys GB/T 6379.1 Accuracy (correctness and precision) of measurement methods and results - Part 1.General principles and definitions GB/T 6379.2 Accuracy (correctness and precision) of measurement methods and results - Part 2.Determining the repeatability of standard measurement methods Basic methods of sex and representation GB/T 6682 Specifications and test methods for water used in analytical laboratories GB/T 8170 Rules for rounding off numerical values and the representation and determination of limiting values GB/T 12806 Laboratory Glassware - Single-mark volumetric flasks GB/T 12807 Graduated Pipettes for Laboratory Glassware GB/T 12808 Laboratory Glassware - Single-mark Pipettes

3 Terms and Definitions

This document does not contain any terms or definitions that need to be defined. 4.Method 1.Perchloric acid dehydration by gravimetric method 4.1 Principle The sample was decomposed with hydrochloric acid and then treated with perchloric acid until it emitted fumes, causing the silicon to form insoluble silicic acid. After filtration and ignition, the sample was weighed. It was then treated with hydrofluoric acid. The silicon content is calculated by igniting the silicon dioxide after it has volatilized, weighing the resulting product, and then calculating the difference between the two weighings. 4.2 Reagents and Materials Unless otherwise specified, only reagents confirmed to be of analytical grade shall be used in the analysis, and the water used in the tests shall be of grade III or higher as specified in GB/T 6682. Distilled water of grade III or higher, deionized water, or water with equivalent purity. ...