原子荧光光谱法测定化探样品中痕量汞

提出了以震荡水浴—聚乙烯膜封闭溶矿、氢化物发生—原子荧光光谱法测定化探样品中汞的分析方法。对溶矿方式、灯电流、载气、屏蔽气流速及硼氢化钾浓度进行了优化选择。在最佳条件下，建立了汞的校准曲线，其相关系数在0.999 1～0.999 3之间，方法检出限为0.125 ng/g。将本方法应用于化探标准样品和实际样品分析，所得结果与认定值或封闭溶样两次金汞齐冷原子吸收光谱法测得值一致，5次平行测定结果的相对标准偏差不大于3.5%。

Determination of trace mercury in geochemical samples by atomic fluorescence spectrometry

The analysis method of mercury in geochemical exploration samples by hydride generation atomic fluorescence spectrometry combined with polyethylene film closed ore dissolution in concussive water bath was proposed. Parameters, including ore dissolution method, lamp current, carrier gas, shielding gas flow and potassium borohydride concentration, were optimized. Under optimal conditions the calibration curve of mercury was established, the correlation coefficients were in range of 0999 10999 3, and the detection limit of mercury was 0.125 ng/g. The proposed method was applied to the analysis of standard and actual geochemical exploration samples, and the determination results were consistent with the certified values or those obtained by two stage gold amalgamation cold vapor atomic absorption spectrometry after closed dissolution. The relative standard deviation (RSD,n=5) was less than 3.5 %.