GB/T 4702.5-2008 English PDF

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GB/T 4702.5-2008: Chromium metal -- Determination of aluminium content -- EDTA titrimetric method and flame atomic absorption spectrometric method
Status: Valid

GB/T 4702.5: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 4702.5-2008	189	Add to Cart	3 days	Chromium metal -- Determination of aluminium content -- EDTA titrimetric method and flame atomic absorption spectrometric method	Valid
GB/T 4702.5-1984	199	Add to Cart	2 days	Methods for chemical analysis of chromium metal--The atomic absorption spectrophotometric method for the determination of aluminum content	Obsolete

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Basic data

Standard ID: GB/T 4702.5-2008 (GB/T4702.5-2008)
Description (Translated English): Chromium metal -- Determination of aluminium content -- EDTA titrimetric method and flame atomic absorption spectrometric method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H11
Classification of International Standard: 77.100
Word Count Estimation: 8,888
Date of Issue: 2008-05-13
Date of Implementation: 2008-11-01
Older Standard (superseded by this standard): GB/T 4702.5-1984; GB/T 4702.6-1984
Quoted Standard: GB/T 4010
Regulation (derived from): National Standard Approval Announcement 2008 No.8 (Total No.121)
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
Summary: This standard specifies the disodium edetate titration and flame atomic absorption spectrometry-Determination of chromium in aluminum content. This section applies to the determination of chromium in aluminum content. Measuring range (mass fraction): 0. 10% -1. 00 %.

GB/T 4702.5-2008: Chromium metal -- Determination of aluminium content -- EDTA titrimetric method and flame atomic absorption spectrometric 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 aluminium content. EDTA titrimetric method and flame atomic absorption spectrometric method ICS 77.100 H11 National Standards of People's Republic of China Replacing GB/T 4702.5 ~ 4702.6-1984 Determination of aluminum content of chromium Disodium EDTA titration and Flame Atomic Absorption Spectrometry Posted 2008-05-13 2008-11-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This part is GB/T 4702.5-1984 "Methods for chemical analysis of chromium metal atomic absorption spectrophotometry aluminum content" and GB/T 4702.6-1984 "Determination of chromium EDTA volumetric method for chemical analysis of aluminum content," the integration of amendments. This Part replaces GB/T 4702.5-1984 and GB/T 4702.6-1984. This portion of the GB/T 4702.5-1984 and GB/T 4702.6-1984 comparison, the main changes are as follows. --- As hydrochloric acid, perchloric acid instead of perchloric acid decomposition sample; --- With ammonium chloride, hexamine in place of ammonia separation interference; --- Play with hydrochloric acid instead of sodium chloride in addition to residual chromium; --- With disodium edetate standard titration solution, titration of zinc standard solution instead of EDTA standard solution titration of aluminum content; --- Instead of using xylenol orange as indicator Cu-PAN. This part is proposed by the China Iron and Steel Association. This section is under the jurisdiction of Metallurgical Industry Information Standards Institute. This section is drafted. Minmetals (Hunan) ferroalloy limited liability company. The main drafters of this section. Huang, Deng Zhihong, Lilong Long, Wang Yanrong, Peng strong again. This part of the standard replaces the previous editions are. --- GB/T 4702.5-1984; --- GB/T 4702.6-1984. Determination of aluminum content of chromium Disodium EDTA titration and Flame Atomic Absorption Spectrometry Warning. Use of this section shall be a person experiences regular laboratory work. This section does not indicate that all possible security issues. Users have the responsibility to take appropriate safety and health practices and to ensure compliance with the conditions relevant national regulations.

1 Scope

This section provides disodium EDTA titration and flame atomic absorption spectrometry chromium aluminum content. This section applies to the determination of chromium in aluminum content. Measurement range (mass fraction). 0.10% to 1.00%.

2 Normative references

The following documents contain provisions which, through reference in this text, constitute provisions of this part. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this section, however, encourage the parties to this part of the research agreement Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this section. GB/T 4010 alloy chemical analysis and preparation of the sample Method 3 a. Titration disodium ethylenediaminetetraacetate 3.1 Principle Sample was dissolved with hydrochloric acid, perchloric acid smoke, then made basic with ammonia to separate most of the chromium. Hydroxide precipitate dissolved in nitric acid, Join smoke perchlorate, chromium chloride acid generated volatile chromium residue with hydrochloric acid, water and dissolved salts, after adjusting the pH to sulfosalicylic acid to indicate Agents, disodium edetate After titration standard solution titration iron, plus disodium edetate over standard titration solution, pH5.3 ~ pH5.9 acidic medium to xylenol orange as indicator. Zinc standard titration solution titrate excess of disodium edetate. plus The ammonium fluoride complex aluminum and release a considerable amount of disodium edetate, and then the zinc standard solution titration titration. According to its consumption, calculated The percentage content of aluminum. 3.2 Reagents and materials Unless otherwise indicated in the analysis using only recognized as analytical grade reagents and distilled water or its equivalent purity water. 3.2.1 ammonium chloride as a solid. 3.2.2 ammonia, ρ0.90g/mL. 3.2.3 perchloric acid, ρ1.67g/mL. 3.2.4 hydrochloric acid, ρ1.19g/mL. 3.2.5 nitrate, ρ1.42g/mL. 3.2.6 hydrochloric acid, 1 + 1. 3.2.7 hydrochloric acid, 99 + 1. 3.2.8 hexamethylenetetramine solution, 250g/L. 3.2.9 hexamethylenetetramine solution, 5g/L. 3.2.10 sulfosalicylic acid solution, 5g/L. 3.2.11 XO solution, 1g/L. Alcohol formulation, now with the current. ......

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