碱消解-P&T-GC-AFS法同时测定土壤中的甲基汞和乙基汞研究  

Simultaneous Determination of Methyl Mercury and Ethyl Mercury in Soil by Alkaline Digestion-P&T-GC-AFS

作　　者：苏荣 洪欣 梁晓曦 王晓飞 许园园[1] 李丽和 

机构地区：[1]广西壮族自治区环境监测中心站,广西南宁530028 [2]广西大学轻工与食品工程学院,广西南宁530004

出　　处：《环境科学与管理》2017年第2期134-137,共4页Environmental Science and Management

基　　金：环保公益性行业科研专项(201309050);广西自然科学基金(2015GXNSFEA139001)

摘　　要：建立了碱消解-吹扫捕集-气相色谱-原子荧光光谱法(P&T-GC-AFS)同时测定土壤中甲基汞和乙基汞的分析方法。样品在90℃条件下经氢氧化钾/甲醇消解2.5 h,调节pH为5.40,并丙基化衍生后,采用P&T-GC-AFS法测定。方法对甲基汞、乙基汞的线性相关系数分别为0.999 7、0.999 6,检出限分别为0.26、0.41 ng·g^(-1)。在不同质量浓度水平上进行加标回收率实验,甲基汞、乙基汞的回收率分别为90.5%~93.3%、86.5%~89.6%。该方法样品前处理简单、检出限低,适合批量测定土壤中甲基汞和乙基汞。A method for the simultaneous determination of methyl mercury and ethyl mercury in soils by P&T-GC-AFS with alkaline digestion was established. Samples were treated under the condition of 90℃ by potassium hydroxide/methanol digestion for 2. 5 h,adjusting p H to 5. 40 and propylation,the eluate obtained was determined by P&T-GC-AFS. Methods for methyl mercury,ethyl mercury linear correlation coefficients were 0. 999 7,0. 999 6,detection limit were 0. 26,0. 41 ng · g-1. The standard addition recovery experiment on different quality levels,recovery of methyl mercury,ethyl mercury is 90. 5% ~ 93. 3%,86. 5% ~ 89. 6%. The method with a simple pre-treatment procedure,low detection limit,is suitable for the determination of methyl mercury and ethyl mercury in soils.

关 键 词：碱消解 甲基汞 乙基汞 吹扫捕集-气相色谱-原子荧光光谱法 

分 类 号：X833[环境科学与工程—环境工程]