热裂解原子吸收法快速测定固体燃料中总汞

Rapid determination of total mercury in solid fuel by thermal cracking atomic absorption

建立高温热裂解原子吸收法快速测定煤和生物质颗粒中总汞含量。样品烘干破碎至粒径1.0 mm以下,取样0.150~0.250 g,煤样和生物质颗粒检测的最佳干燥温度分别为300℃和260℃,干燥时间分别为30 s和20 s,热分解温度分别为800℃和700℃,热分解时间分别为400 s和200 s。高含量汞(0~100 ng)和低含量汞(0~10 ng)均线性良好,汞的检出限为0.0246 ng/g,测定结果的相对标准偏差小于5%(n=7),加标回收率为98.9%~102.1%,该方法灵敏度高,准确、高效。

Total mercury in fuel was rapidly determined by thermal cracking atomic absorption method.The particle size of the sample was less than 1.0 mm,the sampling quality was 0.150-0.250 g,the optimim drying temperatures for coal and biomass particles were 300℃and 260℃,the drying times were 30 s and 20 s,respectively.The temperatures of pyrolysis reaction for coal and and biomass particles were 800℃and 700℃,and the decompositoin times were 400 s and 200 s,respectively.The method has good linearity in the range of 0-100 ng for high concentration mercury absolute content and 0-10 ng for low concentration mercury absolute content,the detect limit of mercury was 0.0246 ng/g,the relative standard deviations were less than 5%(n=7),and the recoveries rates were 98.9%-102.1%.It showed that the method was sensitive,accurate and efficient.