Abstract：The content of gold in geochemical sample was relatively low and it should be separated and enriched before determination. The sample was burned at 650 ℃ followed by dissolution with aqua regia (1+1). The bromine water was added to make sure that all of gold was oxidized to gold(III). Then, gold(III) was adsorbed with polyurethane foam plastic which was pretreated by 20 g/L NaOH-10% acetone solution. After burning at 700 ℃, the ash was dissolved with aqua regia(1+1). Finally, the content of gold in geochemical sample was determined by inductively coupled plasma mass spectrometry (ICP-MS) with 5.0 ng/mL 185Re as internal standard. The results showed that the adsorption rate of gold was up to 98.9% under the following experimental conditions: 1.0 mL of saturated bromine water was added with sampling device for oxidization of gold; the adsorption volume was controlled at about 100 mL; the oscillation adsorption time after adding polyurethane foam plastic was 35 min. The mass concentration of gold in range of 1-10 μg/mL was linear to the corresponding signal intensity with correlation coefficient of 0.999 4. The detection limit of method was 0.12 ng/g. The proposed method was applied to the determination of gold in certified reference materials for geochemical component analysis of platinum family elements, gold ore and geochemical gold. The relative errors (RE) between the results and the certified values were less than 9%. The relative standard deviations (RSD, n=12) were less than 10%.
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