Abstract:

It is found that the present of 0.04% DDTC in sample solution and 0.2% DDTC in reductant solution at the same time can greatly enhance generation efficiency of volatile species of Au.The problem that computer automatic adjustment range does not meet the experimental conditions of shielding gas or carrier gas can be solved by connecting a rotor flowmeter with control valve in series in shielding （or carrier） gas path.The measuring range of the rotor flowmeter is 0~1 200 mL/min，and it can be adjusted manually.The result shows that the optimal signal intensity and signal-to-noise ratio can be gotten when carrier gas flow rate is 100 mL/min and the shield gas flow rate is 700 mL/min.Signal is above ten times stronger than AAS method after optimizing the parameter of instrument and chemical vapor generation.The method is used in determination of gold of ore sample，the results are consistent with those gotten by flame AAS.The reaction mechanism can be assumed by comparing molecule structure of DDTC，polyurethane foam and thiourea molecules，which will help find new gold sensitizations.

Key words: polyurethane foam adsorption, atomic fluorescence spectrometry, sensitization reagent, gold