GB/T 4702.1-2016 English PDF

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GB/T 4702.1-2016: Chromium metal -- Determination of chromium content -- The ammonium ferrous sulfate titrimetric method
Status: Valid

GB/T 4702.1: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 4702.1-2016	109	Add to Cart	2 days	Chromium metal -- Determination of chromium content -- The ammonium ferrous sulfate titrimetric method	Valid
GB/T 4702.1-1997	199	Add to Cart	2 days	Methods for chemical analysis of chromium metal the ammonium ferrous sulfate-volumetric method for the determination of chromium content	Obsolete
GB/T 4702.1-1984	RFQ	ASK	3 days	Methods for chemical analysis of chromium metal--The ammonium ferrous sulfate volumetric method for the determination of chromium content	Obsolete

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Basic data

Standard ID: GB/T 4702.1-2016 (GB/T4702.1-2016)
Description (Translated English): Chromium metal -- Determination of chromium content -- The ammonium ferrous sulfate titrimetric method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H11
Classification of International Standard: 77.100
Word Count Estimation: 5,564
Date of Issue: 1984-10-04
Date of Implementation: 2017-07-01
Older Standard (superseded by this standard): GB/T 4702.1-1997
Regulation (derived from): National Standard Announcement 2016 No.14
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China

GB/T 4702.1-2016: Chromium metal -- Determination of chromium content -- The ammonium ferrous sulfate titrimetric 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.
Chromium metal - Determination of chromium content - The ammonium ferrous sulfate titrimetric method ICS 77.100 H11 National Standards of People's Republic of China Replacing GB/T 4702.1-1997 Metallic chromium - Determination of chromium content Ferrous ammonium sulfate titration 2016-08-29 released 2017-07-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Management Committee released

Foreword

GB/T 4702 is divided into 16 parts. - Part 1. Determination of chromium chromium content - Ammonium ferrous sulfate titration method Part 2. Determination of chromium content in metallic materials - Perchloric acid gravimetric method Part 3. Determination of chromium content in metals - Bismuth - phosphorus - molybdenum blue spectrophotometric method - Part 4. Determination of metallic chromium content - Ethylenediamine tetraacetic acid disodium titration and flame atomic absorption spectrometry - Part 5. Determination of metallic chromium content - Ethylenediamine tetraacetic acid disodium titration and flame atomic absorption spectrometry - Part 6. Determination of metallic ferrochromium, aluminum, silicon and copper content - Inductively coupled plasma atomic emission spectrometric method - Part 7. Determination of chromium content in metals - Distillation separation - Nessler reagent spectrophotometric method - Part 8. Methods for chemical analysis of chromium metal - Distillation - molybdenum blue spectrophotometric method for the determination of arsenic content Part 9. Methods for chemical analysis of metallic chromium - Determination of antimony content by crystal violet spectrophotometry - Part 10. Methods for chemical analysis of metallic chromium - The copper reagent spectrophotometric method for the determination of copper content - Part 11. Methods for chemical analysis of metallic chromium - Determination of tin content by alizarin violet spectrophotometry - Part 12. Determination of chromium, nitrogen and hydrogen content of metals - Inhalation of inert gases - Infrared absorption method and thermal conductivity method Part 13. Methods for chemical analysis of metallic chromium - The polarographic method for the determination of lead content - Part 14. Methods for chemical analysis of metallic chromium - The infrared absorption method for the determination of carbon content - Part 15. Determination of chromium, tin, bismuth, antimony and arsenic content of metallic chromium - Mass spectrometry - Part 16. Determination of chromium content in metals - Infrared absorption method and combustion neutralization titration method This part is part 1 of GB/T 4702. This part is drafted in accordance with the rules given in GB/T 1.1-2009. This part of the GB/T 4702.1-1997 "metal chromium chemical analysis of ammonium ferrous sulfate volumetric determination of chromium." This part compares with GB/T 4702.1-1997, the main technical changes are as follows. --- the standard name to "metal chromium chromium content determination of ammonium ferrous sulfate titration"; --- Added "warning" language; - Added "normative reference documents" and "test reports"; --- using dilute sulfuric acid decomposition sample; The amount of the sample is adjusted from 0.5000g to 0.200g (accurate to 0.0001g). After the sample is dissolved, the product is directly oxidized and titrated. --- "manganese sulfate solution" instead of "potassium permanganate solution"; --- "sodium chloride solution" instead of "hydrochloric acid" decomposition of permanganic acid; --- Direct titration of chromium with standard titration solution of ammonium ferrous sulfate standard, standard titration solution concentration from 0.10mol/L modified to 0.13 mol/L. This part is made by China Iron and Steel Industry Association. This section is under the jurisdiction of the National Technical Committee on Standardization of Pig Iron and Ferroalloys (SAC/TC318). This part of the drafting unit. CITIC Jinzhou Metal Co., Ltd., Jiangsu Province (Shagang Iron and Steel Institute of Iron and Steel, metallurgical industry information standards Academy. This part of the main drafters. Wu Yinjun, Liu Yingjie, year quarter strong, Zhang Jijun, Wang Liang, Zhu Chunyou, Chen Zibin, Lu Chunsheng. This part of the previous version of the standard to replace the release of the situation. --- GB/T 4702.1-1984, GB/T 4702.1-1997. Metallic chromium - Determination of chromium content Ferrous ammonium sulfate titration WARNING - Personnel using this section should have practical experience in formal laboratory work. This section does not indicate all possible security questions question. It is the responsibility of the user to take appropriate safety and health measures and to ensure compliance with the conditions set forth in the relevant national regulations.

1 Scope

This part of GB/T 4702 specifies the determination of chromium content in metallic chromium by ammonium ferrous sulfate titration. This part is applicable to the determination of chromium content in metallic chromium (vanadium ≤ 0.20%), determination range (mass fraction). ≥97.00%.

2 normative reference documents

The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article Pieces. For undated references, the latest edition (including all modifications) applies to this document. GB/T 4010 Ferroalloy chemical analysis of the sample to take and preparation GB/T 6682 Analytical laboratory water specifications and test methods GB/T 12805 Laboratory glass instrumentation burette

3 principle

The sample was dissolved with dilute sulfuric acid. In the appropriate sulfuric acid acidity, silver nitrate as a catalyst, with ammonium persulfate trivalent chromium oxidation to hexavalent, With N-phenyl anthranilic acid as an indicator, titration with ammonium titanate standard titration solution, measured chromium content.

4 reagents and materials

Unless otherwise stated, only the confirmed analytical reagent is used in the analysis, and the water used is distilled or deionized or substantially pure water, Shall comply with the provisions of GB/T 6682 three or more water. 4.1 sulfuric acid, ρ = 1.84 g/mL. 4.2 phosphoric acid, ρ = 1.70 g/mL. 4.3 sodium chloride solution, 50g/L. 4.4 silver nitrate solution, 5g/L. 4.5 ammonium persulfate solution, 250g/L, with the preparation. 4.6 manganese sulfate solution, 1g/L. 4.7 standard solution of potassium dichromate, c (1/6K2Cr2O7) = 0.1000mol/L. 4.9040 g of potassium dichromate reference material dried at 150 ° C to 170 ° C for 2 h and cooled to room temperature was placed in.200 mL of glass Cup, dissolved in a small amount of water, moved to 1000mL volumetric flask, washed several times with water the inner wall of the beaker, washing liquid into the volumetric flask, Release to the scale, mix. 4.8 ammonium ferrous sulfate standard titration solution, about 0.13mol/L 4.8.1 Preparation. Weigh 50.98 g of ammonium ferrous sulfate [(NH4) 2Fe (SO4) 2 · 6H2O] in 1000 mL of sulfuric acid (5 95) ......

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