分散固液微萃取在线热洗脱原子荧光法测定矿泉水中的痕量汞  

Determination of trace mercury in mineral water by on-line heating elution and atomic fluorescence spectrometry after dispersive solid-liquid micro-extraction

作　　者：孙会会[1] 淦五二[1] 曹方方[1] 

机构地区：[1]中国科学技术大学化学系,合肥230026

出　　处：《分析试验室》2012年第7期90-93,共4页Chinese Journal of Analysis Laboratory

摘　　要：研究制备了CI/SiO2/PDMS固相萃取剂,建立了分散固液微萃取在线热洗脱原子荧光联用测定矿泉水中痕量汞的方法。方法使用分散剂将CI/SiO2/PDMS均匀分散于样品溶液中,吸附并富集Hg2+与DDTC形成的Hg-DDTC螯合物。用磁子吸附收集固相萃取剂,并置于石英管中。利用电磁感应加热技术,在线加热洗脱,原子荧光法定量。方法的富集倍数达30倍,检出限为6.0ng/L;精密度RSD为3.8%(n=11,ρ=0.1μg/L)。A new method of dispersive solid-liquid micro-extraction（DSLME） using CI/SiO2/PDMS as solid extraction agents was proposed.Mercury was pre-concentrated by DSLME after formation of mercury diethyldithiocarbamate complex（Hg-DDTC）,and then determined with on-line electromagnetic induction heating elution-cold vapor atomic fluorescence spectrometry.In the present method,small magnetons were used as adsorbing medium of solid extraction agent.Under optimum conditions,the enhancement factor reached 30 times.The detection limit of mercury is 6.0ng/L.The precision is 3.8%（n=11,ρ=0.1μg/L）.

关 键 词：分散固液微萃取 原子荧光 汞 矿泉水 

分 类 号：O657.35[理学—分析化学]