ASTM E2295 Standard Practice for Fire Assay Silver Corrections in Analysis of Metal Bearing Ores, Concentrates, and Related Metallurgical Materials by Silver Determination in Slags and Cupels

ASTM E2295 Standard Practice for Fire Assay Silver Corrections in Analysis of Metal Bearing Ores, Concentrates, and Related Metallurgical Materials by Silver Determination in Slags and Cupels
ASTM E2295用炉渣和灰吹盘中的银测定法在含金属矿物,浓缩物及相关冶金材料的分析中测定火试金法银修正值的标准规范
These methods are primarily intended to be used for the determination of silver correction in the fire assay silver determination. Silver assays are determined by fire assay for the purpose of metallurgical exchange between seller and buyer.
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 under appropriate quality control practices such as those described in Guide E 882.
1. Scope
1.1 This practice covers the determination of silver corrections for fire assay of metal bearing ores, concentrates and related metallurgical materials using the spent slags and cupels from the fire assay process, by gravimetry and atomic absorption spectrophotometry.
1.2 The test methods appear in the following order:
    Sections
Gravimetric Method    10–11
Atomic Absorption Method    12–13
1.3 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. (See Practices E 50 and ISO Guide 35:1989.)

2. Referenced Documents (purchase separately
ASTM Standards
D1193 Specification for Reagent Water
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E50 Practices for Apparatus, Reagents, and Safety Considerations for Chemical Analysis of Metals, Ores, and Related Materials
E135 Terminology Relating to Analytical Chemistry for Metals, Ores, and Related Materials
E882 Guide for Accountability and Quality Control in the Chemical Analysis Laboratory
E1024 Guide for Chemical Analysis of Metals and Metal Bearing Ores by Flame Atomic Absorption Spectrophotometry
E1335 Test Methods for Determination of Gold in Bullion by Fire Assay Cupellation Analysis
ISO Documents
ISO10378:1994 Copper Sulfide Concentrates--Determination of Gold and Silver Contents--Fire Assay Gravimetric and Atomic Absorption Spectrometric Method
Index Terms
cupellation; fire assay; silver; silver correction; Atomic absorption spectrophotometry/spectroscopy; Cupellation method; Cupels; Dor´e correction; Fire assay method; Gravimetric determination; Metal-bearing ores; Metallurgical materials/applications; Silver corrections; Slag;