作者：张倩1,2, 韩贵琳1, 阳昆桦1, 梁涛2, 刘剑3, 胡越2
作者单位：1. 中国地质大学(北京), 北京 100083;
2. 中国科学院地理科学与资源研究所, 北京 100101;
3. 北京市营养源研究所, 北京 100069
关键词：RA-915M测汞仪;固体直接进样法;汞含量;土壤;沉积物
摘要：
土壤和沉积物是汞的生物地球化学循环中重要的汇和源。采用RA-915M测汞仪固体模块的直接进样法，建立土壤和沉积物中汞含量的一种快速测试分析方法。该方法无需对固体样品进行消解、定容等前处理操作，具有快速、准确、分析成本低等特点。探讨该方法的检出限、精密度和加标回收率，结果显示方法检出限为0.132 ng/g，相对标准偏差小于 5%（n=5），加标回收率为92.8%~106%。为进一步检验方法的可靠性，对土壤和沉积物样品分别使用RA-915M测汞仪固体模块、液体模块和原子荧光光度计测试。结果显示，固体直接进样法操作简便、可信度高，更适合测定土壤和沉积物中汞的含量。利用该方法对洞庭湖沉积物和北京农田土壤汞含量进行研究，研究结果与前人研究相符，表明该方法准确、高效，值得推广利用。
Determination and application of mercury in soil and sediment
ZHANG Qian1,2, HAN Guilin1, YANG Kunhua1, LIANG Tao2, LIU Jian3, HU Yue2
1. China University of Geosciences(Beijing), Beijing 100083, China;
2. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
3. Beijing Institute of Nutritional Resources, Beijing 100069, China
Abstract: Soil and sediment are important sinks and sources in the biogeochemical cycle of mercury. A rapid method for determination and analysis of mercury content in soil and sediment was established by direct injection of solid module of RA-915M mercury analyzer. The method was fast, accurate, low cost and without pre-treatment procedures including acid digestion, constant volume, etc. The detection limit, precision and the recoveries of the standard addition of this method were investigated. The result showed that the detection limit was 0.132 ng/g. The relative standard deviation (RSD) was lower than 5% (n=5) and the recoveries of standard addition were 92.8%-106%. To validate the reliability of this method, we compared the results with other two analytical methods including atomic fluorescence spectrometer and mercury analyzer with liquid accessory after microwave digestion, and the results show that the method is simple, reliable and more suitable for the determination of mercury in soil and sediment. The mercury content in Dongting Lake sediments and Beijing farmland soils was studied by this method. The results are in agreement with previous studies. It shows that this method is accurate and efficient, and it is worth popularizing and utilizing.
Keywords: RA-915M mercury analyzer;direct determination of mercury in solid;mercury content;soil;sediment
2018, 44(11): 66-70 收稿日期: 2018-02-14;收到修改稿日期: 2018-04-19
基金项目: 国家自然科学基金（41325010，41661144029）
作者简介: 张倩(1984-),女,山东莱芜市人,博士研究生,主要从事环境地球化学研究
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