不同消解法对土样中汞的测定对比分析

采用微波消解、水浴加热、电热板加热方法消解土壤标准样品,以氢化物发生-原子荧光法测定消解液中汞的含量,比较了几种消解方式的精密度与准确度。结果表明:微波消解法可达到较高的精密度与准确性,其相对标准偏差为1.6%~5.5%;水浴加热法相对标准偏差为2.3%~8.9%,适用于大量样品的消解;电热板法相对标准偏差为1.8%~12.4%,精确度差且酸耗大。水浴加热消解法因其酸耗小、操作简便、测定结果准确度较高等特点更适用于环境监测工作中大批量土壤样品中汞含量的测定。

Comparison of different digestion methods for the determination of mercury in soil samples

In this paper,we chose three methods to digest the standard soil sample,and measured Hg content by hydride generation- atomic fluorescence spectrometry that obviously can tell us the accuracy and precision among these methods. The results indicate that microwave digestion method can reach a highly accuracy and precision and the relative standard deviation was 1. 6% - 5. 5%. Water bath heating method applied to a large number of sample digestion and the relative standard deviation was 2. 3% - 8. 9%. Electric heating plate method was the worst method of the three with relative standard deviation 1. 8% - 12. 4%,low precision and large acid consumption. In conclusion,water bath heating method is more suitable for measuring the content of mercury in large quantities of soil samples because of low acid consumption,easy operation and high accuracy in environmental monitoring work.