新型UVHg-1000紫外光化学发生测汞仪简介及其对水中超痕量汞的检测

研发了一种型号为UVHg-1000的紫外光化学发生测汞仪,用于自来水、地表水、地下水中痕量汞的检测。水中的痕量汞经C18固相萃取小柱(SPE)富集,洗脱进入紫外发生装置产生汞原子,汞原子被导入原子荧光检测器进行检测。本方法首次将固相萃取富集-光化学发生法串联系统应用到测汞领域,提高了检测灵敏度,同时也便于野外采样,样品保存以及样品运输。可通过增加进样环的方式实现自动配制标准曲线;可不经消解,直接测量水样中的有机汞。本方法对水中汞总量的检出限为0.0005μg/L,线性范围0.5～1000 ng/L,相对标准偏差(RSD)为5%以内,线性相关系数(R)>0.995,实际样品回收率为85%-110%。

Introduction of Novel UVHg-1000 UV Vapor Generation based Mercury Analyzer and Trace Level Mercury Determination in Water

Mercury Analyzer(Model UVHg-1000) based on UV vapor generation was developed for trace level mercury determination in tap water,surface water and underground water.C18 solid phase extraction(SPE) column was used for water sample accumulation,and then the eluent was introduced into UV vapor generation system.The mercury atom produced from the UV vapor generation system was detected through atomic fluorescence detector.It is the first time for UV vapor generation technique being employed in the field of mercury determination.In-field sample collection,sample storage and transportation were facilitated through the high efficient SPE accumulation column with an improved sensitivity.The sample loops were added for standard curve generation.Organic mercury could be determined without sample digestion.Under the optimistic condition,the robust system has achieved a detection limit(DL) of 0.0005μg /L with RSD less than 5%,a linear range of 0.5-1000 ng/L with the linear correlation coefficient larger than 0.995,and matrix spiked recovery in the range of 85%-110% for mercury determination.