【国外标准】 Standard Test Method for Determination of Silver in Copper Concentrates by Flame Atomic Absorption Spectrometry

5.1 In the primary metallurgical processes used by the mineral processing industry for copper bearing ores, copper and silver associated with sulfide mineralization are concentrated by the process of flotation for recovery of the metals.5.2 This test method is a comparative method and is intended to be a referee method for compliance with compositional specifications for metal content or to monitor processes.5.3 It is assumed that all who use this method will be trained analysts capable of performing skillfully and safely. It is expected that work will be performed in a properly equipped laboratory and that proper waste disposal procedures will be followed. Appropriate quality control practices must be followed such as those described in Guide E882.1.1 This test method covers the determination of silver in the range of 13 μg/g to 500 μg/g by acid dissolution of the silver and measurement by atomic absorption spectrometry. Copper concentrates are internationally traded within the following content ranges:Element Unit Content RangeAluminum % 0.05 to 2.50Antimony % 0.0001 to 4.50Arsenic % 0.01 to 0.50Barium % 0.003 to 0.10Bismuth % 0.001 to 0.16Cadmium % 0.0005 to 0.04Calcium % 0.05 to 4.00Carbon % 0.10 to 0.90Chlorine % 0.001 to 0.006Chromium % 0.0001 to 0.10Cobalt % 0.0005 to 0.20Copper % 10.0 to 44.0Fluorine % 0.001 to 0.10Gold μg/g 1.40 to 100.0Iron % 12.0 to 30.0Lead % 0.01 to 1.40Magnesium % 0.02 to 2.00Manganese % 0.009 to 0.10Mercury μg/g 0.05 to 50.0Molybdenum % 0.002 to 0.25Nickel % 0.0001 to 0.08Silicon % 0.40 to 20.0Silver μg/g 18.0 to 8000Sulfur % 10.0 to 36.0Tin % 0.004 to 0.012Zinc % 0.005 to 4.301.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.4 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.