悬浮固化分散液液微萃取光度法测定痕量锌  

Determination of Trace Zinc in Water by Dispersive Liquid-liquid Microextraction Based on Solidification of Floating Organic Drop Coupled with Spectrophotometry

作　　者：叶青[1] 陈宗保[1] 洪利明[1] 刘林海[1] 

机构地区：[1]上饶师范学院化学化工学院,江西上饶334001

出　　处：《化学试剂》2015年第8期715-717,共3页Chemical Reagents

基　　金：江西省教育厅科技计划基金资助项目(GJJ12606)

摘　　要：采用悬浮固化分散液液微萃取（DLLME-SFO）分光光度法测定水样中痕量锌。以1-（2-吡啶偶氮）-2-萘酚（PAN）为配位剂,密度小于水,凝固点为24℃的十二醇为萃取剂,乙醇为分散剂,对水样进行分散液液微萃取。对萃取剂和分散剂的类型和体积、溶液的pH、PAN的用量、萃取时间等参数进行了优化。方法的线性范围5.0-800μg/L,检出限0.62μg/L,富集倍数50倍,应用于测定水样中痕量锌,回收率为96%-98.7%。Dispersive liquid-liquid microextraction based on solidification of floating organic drop （DLLME-SFO） followed by speetrophotometry was developed for the analysis of trace zinc in water. In the DLLME-SFO,zinc was first complexed withl-（2- pyridylazo）-2-naphthol（PAN） , and then extracted into a small volume of the extraction solvent （1-dodecanol） with ethanol as a dispersive solvent. The main parameters affecting the performance of DLLME-SFO, such as type and volume of extraction solvent, type and volume of disperser solvent, pH,amount of PAN, extraction time ,were investigated. The calibration graph exhibited linearlty over the range of 5 -800 μg/L, the limit of detection was 0. 62 μg/L, and the enrichment factor was 50. The method was successfully applied to the analysis of zinc in real water with the recoveries in the range of 96. 0% - 98.7%.

关 键 词：悬浮固化分散液液微萃取 分离富集 分光光度法 锌 

分 类 号：O657.32[理学—分析化学]