GB/T 15072.19-2008Test method of precious metal alloys - Determination of vanadium and magnesium contents for silver alloys - Inductively coupled plasma atomic emission spectrometry (English PDF)

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;

1 Scope

GB/T 15072.19-2008 is the Chinese national standard on test method of precious metal alloys - determination of vanadium and magnesium contents for silver alloys - inductively coupled plasma atomic emission spectrometry, in the field of metallurgy. The /T suffix marks it as a recommended standard: it is not compulsory by itself, but it becomes binding as soon as a contract, a tender or a customer specification calls it up - which in practice is how most foreign buyers meet it. It was issued on 31 March 2008 by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of China, and has been in force since 1 September 2008. Classification: ICS 77.120.99, CCS H68. This page is published from the official record of the standard held by the Chinese standards administration: the identification, the dates, the classification and the issuing body are taken from there. The clause text, the tables and the numeric limits are in the document itself, which is delivered complete in English translation.

This section provides the determination of silver alloy of vanadium and magnesium content. This section applies to the determination AgCuV and AgMgNi alloy vanadium and magnesium content, the measurement range (mass fraction). 0.05% to 1%.

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 dissolved in nitric acid, hydrochloric acid precipitation of silver chloride formed was isolated by filtration silver, inductively coupled plasma atomic emission spectrometry (hereinafter Acronym ICP-AES) was measured to calculate the mass fraction of vanadium and magnesium.

4 Reagents and materials

Unless otherwise indicated, this part of the reagents and materials shall comply with the provisions of YS/T 371's.

4.1 Argon ((Ar) >=99.95%).

4.2 hydrochloride (rho1.19g/mL). Nitrate 4.3 (rho1.42g/mL). Hydrochloride 4.4 (1 + 9).

4.5 V stock standard solution. Weigh 0.1000g vanadium ((V) >=99.99%), placed in 200mL beaker, add 5mL hydrochloric acid (4.2), cover the surface of the pan, over low heat until dissolved completely. Cooled to room temperature, moved with hydrochloric acid (4.4) 100mL volumetric flask and dilute to Scale. Mix well. 1mL solution containing 1mg vanadium.

4.6 Magnesium stock standard solution. Weigh 0.3469g magnesium carbonate ((MgCO3) >=99.95%, advance after 1000 °C burning 1h, placed Desiccator, cool to room temperature), placed in 200mL beaker. 5mL of water was added, 3mL hydrochloric acid was added slowly (4.2), covered with a watch glass, Warmed to completely dissolve the reaction to be slowed. Cooled to room temperature, moved with hydrochloric acid (4.4) 100mL volumetric flask and dilute to volume. mix uniform. This solution 1mL 1mg containing magnesium.

5 Instruments

ICP-AES instrument. Under optimum working conditions for those who can reach the following indicators can be used.

5.1 source. argon plasma light source, the generator is not less than the maximum output power of 1.3kW.

5.2 Resolution. Optical resolution of about 200nm is not more than 0.010nm; Optical resolution of about 400nm, there is little To 0.020nm.

5.3 Instrument stability. stability within the instrument 1h (RSD) less than 2.0%.

5.4 The detection limit of the spectrometer. white liquid detection limit of vanadium and magnesium was no more than 0.05mg/L.