GB/T 4702.3-2016 English PDF

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GB/T 4702.3-2016: Chromium metal -- The determination of phosphorus content -- Bismuth phosphate molybdenum blue spectrophotometric method
Status: Valid

GB/T 4702.3: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 4702.3-2016	139	Add to Cart	3 days	Chromium metal -- The determination of phosphorus content -- Bismuth phosphate molybdenum blue spectrophotometric method	Valid
GB/T 4702.3-1984	159	Add to Cart	2 days	Methods for chemical analysis of chromium metal. The molybdenum blue photometric method for the determination of phosphorus content	Obsolete

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Basic data

Standard ID: GB/T 4702.3-2016 (GB/T4702.3-2016)
Description (Translated English): Chromium metal -- The determination of phosphorus content -- Bismuth phosphate molybdenum blue spectrophotometric method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H11
Classification of International Standard: 77.100
Word Count Estimation: 7,712
Date of Issue: 1984-10-04
Date of Implementation: 2017-07-01
Older Standard (superseded by this standard): GB/T 4702.3-1984
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 4702.3-2016: Chromium metal -- The determination of phosphorus content -- Bismuth phosphate molybdenum blue 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.
Chromiun metal - The determination of phosphorus content - Bismuth phosphate molybdenum blue spectrophotometric method ICS 77.100 H11 National Standards of People's Republic of China Replacing GB/T 4702.3-1984 Determination of chromium content in metals Bismuth - phosphorus - molybdenum blue spectrophotometric method 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 3 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 4702.3-1984 "metal chromium chemical analysis method molybdenum blue photometric determination of phosphorus". This part compares with GB/T 4702.3-1984. The main technical changes are as follows. --- the standard name to "metal chromium phosphorus content determination bismuth phosphorus molybdenum blue spectrophotometric method"; --- Added "warning" language; - Added "normative reference documents" and "test reports"; The amount of the sample should be weighed according to the different contents of phosphorus, and the sample is weighed 0.500g, accurate to 0.0001g; --- measured wavelength from 825nm to 700nm; --- sodium sulfite instead of sodium bisulfite reduction test solution; --- using ammonium molybdate and bismuth nitrate mixed solution for the color test solution; - Reduction with ascorbic acid instead of hydrazine sulfate; --- color temperature from boiling water bath to 20 ℃ ~ 30 ℃ color; --- will allow the difference from three levels to four levels. 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. The main drafters of this part. Jin Aidi, Sun Xiaofei, Gu Feng, Li Yaguang, Zhou Qiang, Chen Zibin, Lu Chunsheng. This part of the previous version of the standard to replace the release of the situation. --- GB/T 4702.3-1984. Determination of chromium content in metals Bismuth - phosphorus - molybdenum blue spectrophotometric method 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 phosphorus content by bismuth phosphorus molybdenum blue spectrophotometry. This part is applicable to the determination of phosphorus content in metal chromium, the determination range (mass fraction). 0.002% ~ 0.040%.

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 Metallurgical products - Chemical analysis - Spectrophotometric methods GB/T 12806 Laboratory glass instruments Single line capacity bottles GB/T 12807 Laboratory glass instruments - Index pipettes GB/T 12808 Laboratory glass instruments Single line suction pipette

3 principle

The sample was dissolved with perchloric acid, heated to chlorate, so that phosphorus was oxidized to orthophosphoric acid, with hydrochloric acid and sodium chloride in addition to chromium. In sulfuric acid medium, Phosphorus and bismuth and ammonium molybdate to produce yellow bismuth phosphorus molybdenum heteropoly acid, with ascorbic acid to be reduced to bismuth phosphorus molybdenum blue heteropoly acid, in the spectrophotometer measured its suction Luminosity.

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, Should comply with GB/T 6682 secondary water requirements. 4.1 Sodium chloride, solid. 4.2 perchloric acid, ρ = 1.70 g/mL. 4.3 Hydrochloric acid, ρ = 1.19 g/mL 4.4 ammonia, ρ = 0.90g/mL. 4.5 Sulfuric acid, 1 1. 4.6 ascorbic acid, 20g/L, with the preparation. 4.7 sodium sulfite, 5g/L. 4.8 ammonium molybdate solution, 24g/L. ......

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