GB/T 15072.5-2008 English PDF

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GB/T 15072.5-2008: Test method of precious metal alloys -- Determination of silver content for gold and palladium alloys -- Potentiometer titration with potassium iodide
Status: Valid

GB/T 15072.5: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 15072.5-2008	189	Add to Cart	3 days	Test method of precious metal alloys -- Determination of silver content for gold and palladium alloys -- Potentiometer titration with potassium iodide	Valid
GB/T 15072.5-1994	199	Add to Cart	2 days	Gold, Palladium alloys-Determination of silver content	Obsolete

Similar standards

GB/T 17472   GB/T 17473.2   GB/T 17473.5   GB/T 15072.1   GB/T 15072.12   GB/T 15072.11   

Basic data

Standard ID: GB/T 15072.5-2008 (GB/T15072.5-2008)
Description (Translated English): Test method of precious metal alloys -- Determination of silver content for gold and palladium alloys -- Potentiometer titration with potassium iodide
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H68
Classification of International Standard: 77.120.99
Word Count Estimation: 8,884
Date of Issue: 2008-03-31
Date of Implementation: 2008-09-01
Older Standard (superseded by this standard): GB/T 15072.5-1994
Quoted Standard: YS/T 371
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 palladium alloy silver content. This section applies to AuAgPt, AuAgCu, AuAgCuGd, AuAgCuMnGd, AuCuPtAgZn, PdAgCuAuPtZn, PdAgCu, determination PdAg alloy silver content. Measurement range (mass fraction): 15% to 90%.

GB/T 15072.5-2008: Test method of precious metal alloys -- Determination of silver content for gold and palladium alloys -- Potentiometer titration with potassium iodide

---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 silver content for gold and palladium alloys. Potentionmeter titration with potassium iodide ICS 77.120.99 H68 National Standards of People's Republic of China Replacing GB/T 15072.5-1994 Precious metal alloys - Determination of gold and palladium alloy of silver content Potentiometric titration with potassium iodide 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 5. This Part replaces GB/T 15072.5-1994 "precious metals and their alloys - gold, palladium alloys Determination of silver content." This section compared with the GB/T 15072.5-1994, have the following main changes. --- Standard name by the GB/T 15072.5-1994 "precious metals and their alloys - gold, silver palladium alloy measured Given the potential law indicate the end.

4 Reagents and materials

Unless otherwise noted, all reagents and utensils, etc. should be in line with YS/T 371 standard. 4.1 hydrochloride (ρ1.19g/mL). 4.2 nitrate (ρ1.42g/mL), pure class distinctions. 4.3 Ammonia (ρ0.91g/mL). 4.4 silver standard solution. Weighed 2.0000g of metallic silver (silver content of not less than 99.99%), accurate to 0.00001g, placed in 250mL beaker, Plus 40mL of nitric acid (1 + 1, pure class distinctions), cover the surface of the pan, heat until completely dissolved, in time to make the nitrogen oxides, removed, cooled to room temperature. Rushing water Wash the beaker and watch glass wall, the brown solution was transferred into 1000mL volumetric flask, diluted with water to the mark. Mix well. This solution containing 1mL 2.000mg silver stored. 4.5 KI standard titration solution. [Ba (KI) about 0.020mol/L] 4.5.1 preparation. Weigh 3.32g of potassium iodide, dissolved in water and diluted to 1000mL, and mix. 4.5.2 Calibration. Calibration and measurement sample were parallel. Pipette 20.00mL three silver standard solution were placed in 150mL beaker on a hot plate at a low temperature steam until nearly dry. Rinse burn Beibi, add 4mL ammonia, 20mL water. Silver - silver iodide electrode as indicator electrode, a saturated calomel electrode as the reference electrode, with standard potassium iodide Titration solution titrated to the maximum potential jump is the end. Poor standard titration should potassium iodide solution volume consumed over parallel calibration 0.05mL, averaged. According to equation (1) to calculate the actual concentration of potassium iodide standard titration solution. ......

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