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GB/T 15072.8-2008: Test method of precious metal alloys -- Determination of copper content for gold, palladium and silver alloys -- Complexometric return titration using thiourea relasing EDTA
Status: Valid GB/T 15072.8: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 15072.8-2008 | English | 189 |
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Test method of precious metal alloys -- Determination of copper content for gold, palladium and silver alloys -- Complexometric return titration using thiourea relasing EDTA
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GB/T 15072.8-2008
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| GB/T 15072.8-1994 | English | 199 |
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Gold, Palladium and silver alloys-Determination of copper content
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GB/T 15072.8-1994
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PDF similar to GB/T 15072.8-2008
Basic data | Standard ID | GB/T 15072.8-2008 (GB/T15072.8-2008) | | Description (Translated English) | Test method of precious metal alloys -- Determination of copper content for gold, palladium and silver alloys -- Complexometric return titration using thiourea relasing EDTA | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H68 | | Classification of International Standard | 77.120.99 | | Word Count Estimation | 8,893 | | Date of Issue | 2008-03-31 | | Date of Implementation | 2008-09-01 | | Older Standard (superseded by this standard) | GB/T 15072.8-1994 | | Quoted Standard | YS/T 371 | | Regulation (derived from) | National Standard Approval Announcement 2008 No.5 (Total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 gold, determination of silver alloy copper content, palladium. This section applies to AuAgCu, AuAgCuGd, AuCuNiZn, AuCuNiZnMn, PdAgCu, PdAgCuAuPtZn, AgCu, AgCuV, determination AgCuNiAl alloy of copper content. Measuring range (mass fraction): 4% to 35%. | GB/T 15072.8-2008: Test method of precious metal alloys -- Determination of copper content for gold, palladium and silver alloys -- Complexometric return titration using thiourea relasing 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.Determiantion of copper content for gold, palladium and silver alloys.Complexometric return titration using thiourea relasing EDTA
ICS 77.120.99
H68
National Standards of People's Republic of China
Replacing GB/T 15072.8-1994
Precious metal alloys -
Determination of gold, palladium, silver alloy of copper content
Thiourea precipitated back titration with EDTA
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 8.
This Part replaces GB measured/T 15072.8-1994 "precious metals and their alloys - gold, palladium, silver alloy of copper content
set".
This section compared with the GB/T 15072.8-1994, have the following main changes.
--- Standard name by the GB/T 15072.8-1994 "precious metals and their alloys - gold, palladium, silver alloy of copper content
Determination of precious metal alloys - gold, palladium, silver and copper alloys - Determination of the amount of precipitation EDTA thiourea envelope "to"
Together back titration ";
--- The new standard requires the preparation of solution preparation, concentration and other representation has been revised;
--- Original standard range AuAgCu20-20, AuAgCu35-5, AuAgCu13-20, AuCuNiZn22-2.5-1,
AuCuNiZn30-3-0.7, AuCuNiZnMn18-1.8-0.7-0.03, PdAgCu65-20, PdAgCu54-21,
PdAgCu68-27, PdAgCu52-28, PdAgCu58-32, PdAgCuAuPtZn30-14-10-10-1, AgCu10,
AgCu12.5, AgCuV10-0.2, AgCuNiAl20-2-1 modify this standard applies to AuAgCu, AuAgCuGd,
AuCuNiZn, AuCuNiZnMn, PdAgCu, PdAgCuAuPtZn, AuCuPtAgZn, AgCu, AgCuV,
Determination AgCuNiAl alloy of copper content; measurement range (mass fraction). 4% to 35%;
--- 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. An Zhongqing, Julia, Jinya Qiu.
This part of the standard replaces the previous editions are.
--- GB/T 15072.8-1994.
Precious metal alloys -
Determination of gold, palladium, silver alloy of copper content
Thiourea precipitated back titration with EDTA
1 Scope
This section provides the determination of gold, palladium, silver alloy of copper content.
This section applies to AuAgCu, AuAgCuGd, AuCuNiZn, AuCuNiZnMn, PdAgCu, PdAgCuAuPtZn,
AgCu, AgCuV, Determination of copper content AgCuNiAl alloys. Measurement range (mass fraction). 4% to 35%.
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
Silver alloy sample was dissolved in nitric acid solution, the addition of excess EDTA solution with copper, nickel, vanadium and aluminum complex; palladium-silver alloy with copper nitrate solution
Solution of palladium and gold alloy platinum silver, copper gold zinc alloy sample was dissolved in a mixed acid, hydrochloric acid and nitric acid. Alloy with gold sulfite reduction and separation of gold; containing
Alloys of palladium with dimethylglyoxime precipitation separation palladium solution, the addition of excess EDTA solution with copper, nickel, zinc, manganese and gadolinium complexes.
In hexamethylenetetramine as a buffer, a solution of xylenol orange as indicator, titrated at pH5.8 using lead standard solution back titration. Added sulfur
Urea solution, a solution of ascorbic acid and 1.10-phenanthroline solution and precipitate the copper complex of EDTA, and then lead standard solution titration to determine the titration
The amount of copper.
4 Reagents and materials
Unless otherwise indicated, all reagents shall conform YS/T 371 standard.
4.1 sodium chloride.
4.2 hexamethylenetetramine.
4.3 sulfite (ρ1.03g/mL).
4.4 hydrochloride (ρ1.19g/mL).
Nitrate 4.5 (ρ1.42g/mL).
4.6 Ammonia (ρ0.90g/mL).
Mixing hydrochloric acid and nitric acid 4.7. 3 per unit volume of hydrochloric acid (4.4) and 1 unit volume of nitric acid (4.5) are mixed. The time is now equipped with.
Mixing hydrochloric acid and nitric acid 4.8. 30 unit volume of hydrochloric acid (4.4) and 1 unit volume of nitric acid (4.5) are mixed. The time is now equipped with.
4.9 hydrochloric acid solution (1 + 1).
4.10 hydrochloric acid solution (99 + 1).
4.11 nitric acid solution (1 + 1).
4.12 ammonia solution (1 + 1).
4.13 thiourea solution (100g/L).
4.14 ascorbic acid solution (50g/L), the time is now equipped with.
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