基于王水石墨密封消解体系-原子荧光法测定土壤和沉积物中汞、砷

Determination of mercury and arsenic in soils and sediments using aqua regia graphite sealed digestion system based atomic fluorescence spectrometry

为解决土壤和沉积物样品中的汞、砷前处理中的一些问题,如耗时长、清洗流程复杂及汞污染等,建立了一种基于王水石墨密封消解体系的前处理新方法,结合原子荧光可用于土壤和沉积物中Hg和As的测定。在最优条件下,2种重金属元素测定结果表明,本方法具有较低的相对误差(Hg,-9.3%~9.3%;As,-7.0%~5.1%),较高的加标回收率(Hg,93.2%~104.5%;As,95.9%~103.5%)。此外,本方法相关性能指标均优于现行标准方法,具有稳定性好、精密度好、准确度高等优点。更重要的是,本方法因采用成本低廉的一次性塑料管,无需消解管清洗,避免了汞的污染。而且,消解过程无需其它操作,消解液用量少,具有操作简单、成本低、无汞污染等优点,可用于大通量土壤和沉积物Hg、As含量的测定。

Some problems in pre-treatment of soil and sediment sample would influence the analysis performance,such as time consuming,complex cleaning process and mercury pollution.Herein,a novel regia graphite sealed digestion system integrated with atomic fluorescence method was established for the determination of Hg and As from soils and sediments.Under the optimized conditions,the low relative errors and satisfactory recoveries were obtained after samples measurement as(Hg,-9.3%~9.3%;As,-7.0%~5.1%),and(Hg,93.2%~104.5%;As,95.9%~103.9%),respectively.Importantly,our method indicated better than the current standard one because of its excellent stability,good precision/accuracy,and no mercury was released owing to avoiding the procedure of cleaning digestion pipe,which was necessary using traditional approaches.In summary,the fabricated method has the advantages of simple operation,low cost,and no mercury pollution,indicating great potentials in Hg and As analysis from large-flux soils and sediments.