Abstract：After the sample was roasted and digested in aqua regia by steam heating. The trace gold in sample solution after digestion was adsorbed for twice with two pieces of polyurethane foam plastics. The foam plastics were merged and ashed followed by dissolution with aqua regia. The internal standard Re was selected for correction. Thus, a determination method of trace gold in geochemical sample by inductively coupled plasma mass spectrometry (ICP-MS) was established. The conditions of digestion, adsorption and desorption were optimized. The results showed that when the sample was digested by steam heating, the determination results of gold were the same as those obtained by electric heating plate digestion. However, the steam heating digestion could save electrical energy and effectively reduce the external pollution. The certified reference materials of geochemical gold were selected for comparison tests. Two pieces of foam plastics were used for absorption in twice with absorption time keep the same. The recoveries of gold were between 97% and 101%, which were more close to 100% compared to those obtained by two pieces of foam plastics for once absorption (i.e., 87%-92%). The gold-loaded foam plastics were firstly ashsed at 180℃ for 20min. Then the temperature was increased to 700℃ within 50min and the foam plastics were further ashed for 1h. The recoveries of gold in certified reference materials of geochemical gold were stable near 100%. Under the selected experimental conditions, the linear correlation coefficient of calibration curve was 0.9996. The detection limit of method was 0.13ng/g. The lower and upper determination limit was 0.43ng/g and 120ng/g, respectively. The proposed method was applied for the determination of gold in three certified reference materials of geochemical gold, three soil samples and three stream sediments. It was found that the results of certified reference materials of geochemical gold were consistent with the certified values. The relative standard deviations (RSD, n=12) of the determination results of gold were between 2.9% and 6.4%. The recovery test of standard addition was conducted according to the experimental method with certified reference materials of geochemical gold. The recoveries were between 98% and 104%.
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