CHANGCHUN GOLD RESEARCH INSTITUTE

Chemical assay method for gold concentrate

Science and technology category of the project: National standards
The revision of the national standard, “Chemical assay method for gold concentrate” is to revise and complete the assay methods for gold, silver, and arsenic stipulated in the old national standards, GB/T7739-87, and draw up analytical standards for copper, lead, zinc, iron, sulphur, carbon, antimony, and bismuth, which makes the standards even complete and applicable, and fills up the gaps in international standards
The revision and application of the national standard, “Chemical assay method for gold concentrate” will play a positively role in promotion to the development of the gold industry in China.

The main contents of the project:
“Chemical assay method for gold concentrate—content determination for gold and silver”:
Fire assay to determine gold and silver contents;

“Chemical assay method for gold concentrate—content determination for silver”:
Atomic absorption spectrometry method to determine silver content

“Chemical assay method for gold concentrate—content determination for arsenic”:
Method 1: Diethyl aminodithioformic acid Spectrophotometry method to determine arsenic content;
Method 2: Iodometry method to determine arsenic content;
Method 3: Hypo-phosphate method to determine arsenic content;

“Chemical assay method for gold concentrate—content determination for copper”:
Method 1: Atomic absorption spectrometry method to determine copper content
Method 2: Sodium thiosulfate iodometry to determine copper content

“Chemical assay method for gold concentrate—content determination for lead”:
Method 1: Atomic absorption spectrometry method to determine lead content;
Method 2: EDTA volumetric method to determine lead content;

“Chemical assay method for gold concentrate—content determination for zinc”:
Method 1: Atomic absorption spectrometry method to determine lead content;
Method 2: EDTA volumetric method to determine lead content;

“Chemical assay method for gold concentrate—content determination for iron”:
Dichromate titrimetry method to determine iron content;

“Chemical assay method for gold concentrate—content determination for sulphur”:
Method 1: Barium sulfate gravimetric method to determine sulphur content;
Method 2: Burning-acid-base titration to determine sulphur content

“Chemical assay method for gold concentrate—content determination for carbon”:
Nonaqueous titrations method to determine carbon content;

“Chemical assay method for gold concentrate—content determination for antimony”:
Method 1: Cerous sulphate titration method to determine antimony content;
Method 2: Hydride generation-atomic fluorescence spectrophotometry method to determine antimony content;

“Chemical assay method for gold concentrate—content determination for arsenic and bismuth”:
Hydride generation-atomic fluorescence spectrophotometry method to determine arsenic and bismuth contents

This project was awarded the first prize for science and technology development by China Gold Association in 2007.