碱法消解-化学衍生-吹扫捕集气相色谱-原子荧光光度法测定土壤中烷基汞  

Determination of alkyl mercury in soil by alkaline digestion-chemical derivatization-purge and trap gas chromatography-atomic fluorescence spectrometry

作　　者：岳中慧 赵方舟 刘剑 易文杰 YUE Zhonghui;ZHAO Fangzhou;LIU Jian;YI Wenjie(Changsha Uranium Geology Research Institute,Changsha 410007,China;Hunan Provincial Department of Ecology and Environment,Changsha 410014,China)

机构地区：[1]核工业二三〇研究所,长沙410007 [2]湖南省生态环境事务中心,长沙410014

出　　处：《化学分析计量》2023年第2期57-61,共5页Chemical Analysis And Meterage

摘　　要：利用吹扫捕集气相色谱-原子荧光光度法测定土壤中烷基汞含量。分别用酸法消解和碱法消解处理土壤样品,对比了两种样品处理方法的效果,结果表明碱法消解优于酸法消解,该法具有步骤少,耗时短,使用的试剂种类少、毒性小,土壤中烷基汞回收率高等优点。甲基汞、乙基汞的质量在0.5~1000 pg范围内与色谱峰面积线性关系良好,相关系数分别为0.9999和0.9998,当称样质量为0.5 g时,甲基汞的检出限为0.35μg/kg,乙基汞的检出限为0.53μg/kg。土壤样品加标回收率为70.0%~114.0%,测定结果的相对标准偏差为3.5%~12.0%(n=5)。The content of alkyl mercury in soil was determined by alkali digestion-chemical derivatization-atomic fluorescence spectrometry.The soil sample was respectively treated with acid method and alkali method,and the differences of the two pretreatment methods was compared,which showed that the alkali digestion was better than the acid digestion in the experimental results,with less steps,short time-consuming,less types of reagents,low toxicity and hight recovery of alkyl mercury in soil.The mass of methyl mercury and ethyl mercury had a good linear relationship with the chromatographic peak area in the range of 0.5-1000 pg,and the correlation coefficients were 0.9999 and 0.9998 respectively.When the sample weight was 0.5 g,the detection limit of methyl mercury was 0.35μg/kg,and the detection limit of ethyl mercury was 0.53μg/kg.The recoveries rate of soil samples were 70.0%-114.0%,and the relative standard deviations of determination results were 3.5%-12.0%(n=5).

关 键 词：碱法消解 化学衍生 原子荧光光度法 土壤 烷基汞 

分 类 号：O657[理学—分析化学]