Determination of Trace Gold in Geochemical Sample by Z-2000 GFAAS

Trace gold is concentrated with foam plastics,by extrication of sulfur thiourea solution,using the technology of slope-heating and pyrolytic coated graphite tube for measure trace gold by Z-2000 graphite furnace atomic absorption spectrometry(GFAAS),we discuss the influences of standard curve and working curve on the determination result.By standard recovery experiment,various methods compare and determination of the first class national standard materials,the detection limit of the method is 0.1×10-9,the recovery rate is 96%～110% and the precision is 3%～11%,which satisfy analysis requirements of trace gold in 1∶50 000 geochemical sample.