GB/T 15072.9-2008 English PDF

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GB/T 15072.9-2008: Test method of precious metal alloys -- Determination of indium content for gold alloys -- Complexometric return titration using EDTA
Status: Valid

GB/T 15072.9: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 15072.9-2008	169	Add to Cart	3 days	Test method of precious metal alloys -- Determination of indium content for gold alloys -- Complexometric return titration using EDTA	Valid
GB/T 15072.9-1994	199	Add to Cart	2 days	Gold alloys-Determination of indium content	Obsolete

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Basic data

Standard ID: GB/T 15072.9-2008 (GB/T15072.9-2008)
Description (Translated English): Test method of precious metal alloys -- Determination of indium content for gold alloys -- Complexometric return titration using EDTA
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H68
Classification of International Standard: 77.120.99
Word Count Estimation: 7,792
Date of Issue: 2008-03-31
Date of Implementation: 2008-09-01
Older Standard (superseded by this standard): GB/T 15072.9-1994
Quoted Standard: YS/T 371
Regulation (derived from): National Standard Approval Announcement 2008 No.5 (Total No.118)
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 method for the determination of gold alloy of indium content. This section applies to the determination AuNiIn alloy indium content. Measuring range (mass fraction): 7% to 10%.

GB/T 15072.9-2008: Test method of precious metal alloys -- Determination of indium content for gold alloys -- Complexometric return titration using EDTA

---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.
Test method of precious metal alloys.Determination of indium content for gold alloys.Complexometric return titration using EDTA ICS 77.120.99 H68 National Standards of People's Republic of China Replacing GB/T 15072.9-1994 Precious metal alloys - Determination of indium content of gold alloys EDTA complexometric back titration Posted 2008-03-31 2008-09-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard is GB/T 15072-1994 "precious metals and their alloys -" (all parts) the integration of amendments into Part 19. Determination --- GB/T 15072.1-2008 Methods for chemical analysis of precious metal alloys of gold, platinum, palladium, gold alloy amount of ferrous sulfate Potentiometric titration; --- GB/T 15072.2-2008 Methods for chemical analysis of precious metal alloys silver alloys Determination of silver content of sodium chloride potential drop Titration; --- GB/T 15072.3-2008 Methods for chemical analysis of precious metal alloys of gold, platinum, palladium, platinum alloys determining the amount of potassium permanganate Current titration; --- GB /15072.4-2008 Methods for chemical analysis of precious metal alloys of palladium, silver-palladium alloy determining the amount of T-dimethyl glyoxal Gravimetric method; --- GB/T 15072.5-2008 Methods for chemical analysis of precious metal alloys of gold, measuring the potential of potassium iodide palladium alloy of silver content drops Titration; --- GB/T 15072.6-2008 precious metal alloys - Determination of platinum, palladium, iridium alloy in determining the amount of ferrous sulfate Current titration; --- GB/T 15072.7-2008 precious metal alloys - Gold alloys chromium and iron content - Inductively coupled plasma Plasma atomic emission spectrometry; --- GB/T 15072.8-2008 precious metal alloys - gold, palladium, silver and copper alloys - Determination of the amount of precipitation thiourea EDTA complexometric back titration; --- GB/T 15072.9-2008 precious metal alloys - Gold alloys - Determination of the amount of indium by EDTA back drop Titration; --- GB/T 15072.10-2008 precious metal alloys - Gold alloys - Determination of nickel by EDTA back drop Titration; --- GB/T 15072.11-2008 precious metal alloys - gold alloy of gadolinium and beryllium content - Inductively coupled plasma Plasma atomic emission spectrometry; --- GB T 15072.12-2008 precious metal alloys - Silver alloys - Determination of vanadium content/hydrogen peroxide spectrophotometer Law degree; --- GB/T 15072.13-2008 precious metal alloys - Tin in silver, cerium and lanthanum content - Inductively coupled Plasma atomic emission spectrometry; --- GB/T 15072.14-2008 precious metal alloys - silver alloy of aluminum and nickel content - Inductively coupled plasma Plasma atomic emission spectrometry; --- GB T 15072.15-2008 precious metal alloys - gold, silver, palladium alloy of nickel, zinc and manganese contents / Inductively coupled plasma atomic emission spectrometry; --- GB/T 15072.16-2008 precious metal alloys - gold alloy of copper and manganese content - Inductively coupled plasma Plasma atomic emission spectrometry; --- GB/T 15072.17-2008 precious metal alloys - Determination of tungsten content of a platinum alloy of tungsten trioxide weight Method; --- GB/T 15072.18-2008 precious metal alloys - Gold alloys of zirconium and gallium content - Inductively coupled plasma Plasma atomic emission spectrometry; --- GB/T 15072.19-2008 precious metal alloys - silver vanadium alloys and magnesium content - Inductively coupled plasma Plasma atomic emission spectrometry. This section GB/T 15072-2008 Part 9. This Part replaces GB/T 15072.9-1994 "chemical analysis of precious metals and their alloys - Gold alloys - Determination of indium content." This section compared with the GB/T 15072.9-1994, have the following main changes. --- Standard name by the GB/T 15072.9-1994 "precious metals and their alloys - Gold alloys - Determination of indium content of" change More "precious metal alloys - Gold alloys - Determination of indium content back titration with EDTA"; --- The new standard requires the preparation of solution preparation, concentration and other representation has been revised; --- Original standard range AuNiIn9-8 modify this standard applies to the determination AuNiIn alloy indium content; measurement range (mass Score). 7% to 10%; --- According to GB/T 20001.4-2001 format requirements rewritten. This part is proposed by the China Nonferrous Metals Industry Association. The non-ferrous metal part by the National Standardization Technical Committee. This section is your research Platinum Ltd. is responsible for drafting. The main drafters of this section. Jinya Qiu, Wu Ruilin, An Zhongqing, Giulia. This part of the standard replaces the previous editions are. --- GB/T 15072.9-1994. Precious metal alloys - Determination of indium content of gold alloys EDTA complexometric back titration

1 Scope

This section provides the determination of gold alloys indium content. This section applies to the determination AuNiIn alloy indium content. Measurement range (mass fraction). 7% to 10%.

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. 371 precious metal alloys - General rules and regulations YS/T

3 Method summary

Sample was dissolved in a mixed acid, hydrochloric acid and nitric acid. Sulfite reduction and separation of gold, dimethyl glyoxal oxime ethanol precipitation separation of nickel is added Excess edetate disodium (EDTA) solution and indium complexed with xylenol orange as indicator, titrate with lead standard solution back titration, measuring Given the amount of indium.

4 Reagents and materials

Unless otherwise noted, reagents and vessels shall comply with YS/T 371 standard. 4.1 crystalline sodium acetate (CH3COONa · 8H2O). 4.2 Glacial acetic acid (ρ1.05g/mL). 4.3 hydrochloride (ρ1.19g/mL). Nitrate 4.4 (ρ1.42g/mL). 4.5 sulfite (ρ1.03g/mL). 4.6 Ammonia (ρ0.90g/mL). 4.7 ammonia solution (1 + 1). 4.8 ammonia solution (99 + 1). 4.9 hydrochloric acid solution (1 + 1). Mixing hydrochloric acid and nitric acid 4.10. 3 per unit volume of hydrochloric acid (4.3) and 1 unit volume of nitric acid (4.4) is mixed with a time of existing service. 4.11 tartaric acid solution (500g/L). 4.12 sodium chloride solution (100g/L). 4.13 ammonium chloride solution (250g/L). 4.14 glyoxal oxime dimethyl ethanol solution (15g/L). 4.15 acetic acid - sodium acetate buffer solution (pH5.8). Weigh 100g crystallized sodium acetate (4.1), add 4.5mL glacial acetic acid (4.2), dilute with water Diluted to 500mL. 4.16 disodium edetate [Na2EDTA · 2H2O (abbreviated. EDTA)] solution (about 0.01mol/L). 4.17 Indium standard solution. Weigh 0.100g metal indium (indium content of not less than 99.99%), accurate to 0.0001g, placed ......

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