热裂解原子吸收法快速测定固体燃料中总汞
陈晖晖
福建省锅炉压力容器检验研究院,国家工业锅炉质量监督检验中心(福建),福州 350008
Rapid determination of total mercury in solid fuel by thermal cracking atomic absorption
陈晖晖
Fujian Province Inspection and Research Institute for Boilers and Pressure Vessels, National Industrial Boilers Quality Supervision and Inspection Center(Fujian), Fuzhou 350008, China
摘要: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0.024 6 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。
Abstract: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 0.024 6 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.
关键词:热裂解原子吸收法;固体燃料;总汞
Keywords:thermal cracking atomic absorption; solid fuel; total mercury
基金:福建省科技计划项目(2019L3020);国家市场监督管理总局科技计划项目(2019MK035);福建省特种设备检验研究院科研项目(FJGJ2019006)
本文引用格式:
陈晖晖.热裂解原子吸收法快速测定固体燃料中总汞[J].化学分析计量,2020,29(5):32-36.
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