【国外标准】 Standard Test Methods for Determination of Gold in Bullion by Fire Assay Cupellation Analysis

4.1 These test methods are intended for the determination of the gold content of gold and silver bullion. It is assumed that all who use these test methods are trained assayers capable of performing common fire assay procedures skillfully and safely. It is expected that work will be performed in a properly equipped laboratory.1.1 These test methods cover cupellation analysis of bullion having chemical compositions within the following limits:  Element  Concentration Range, %   Gold 0.5 to 4.0 and 20.0 to 99.8Silver 1.0 to 99.5Total gold plus silver 75.0 to 100.01.2 These test methods appear in the following order:  Sections   20.0 % – 99.0 % gold 10 – 170.5 % – 4.0 % gold 18 – 2398.9 % – 99.8 % gold 24 – 301.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific safety hazards, see Section 8.1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.