应用固体测汞仪，采用多标准土壤样品（ n＞20）绘制校准曲线法和单一标准土壤样品绘制校准曲线法，分别对土壤中的汞进行测定。结果表明，两者的方法检出限分别为0.30、1.49 ng，平行样（n＝6）的相对标准偏差分别为3.6％～4％、5.4％～9.0％，90 d内的重复性精密度为4.1％，对国家土壤标样进行测定，结果与标准值相符。表明与单一标准土壤样品绘制校准曲线法相比，多标准土壤样品绘制标准曲线法具有更好的精密度、更低的检出限，更强的适用性，并且由于校准曲线长期稳定性，有效缩短土壤中汞的检测周期。%Total mercury in the state standard soil samples were determined using direct analyzer with solid sampling by multi-state standard soil-calibration curve and single-state standard soil-calibration curve. The results showed that the detection limits were 0. 30 and 1. 49 ng, the relative standard deviations of parallel samples ( n =6 ) were 3. 6%-4% and 5. 4%-9. 0%, the repeatability precisions in 90 days was 4. 1%. This suggested that the method of multi-state standard soil-calibration curve had the lower detection limit,the better replicability precision,and the better reproducibility precision.
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