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《Chinese Journal of Analysis Laboratory》 2012-09
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The determination of trace amount of lead ions in water by FAAS after preconcentration with imprinting of functional mesoporous silica

PU Qiu-mei,REN Feng-lian,JIANG Fang-ming and HUANG Hui-qin(Key Laboratory of Resources Chemistry of Nonferrous Metals,Central South University,Changsha 410083)  
Molecular imprinting functional mesoporous silica was prepared by using lead ion as a template and 2-mercaptobenzothiazole as a modification agent.The material was characterized by scanning electron microscopy(SEM) and FT-IR.It was found that the functional material had selective affinity for lead ions,it could be easily separated from Cu(Ⅱ),Cd(Ⅱ) and Hg(Ⅱ) and its maximum capacity was 0.64 mmol/g.When it was made into minicolumn to preconcentrate trace amount of lead ions in water,the saturated column could be eluted by 2 mL of EDTA(0.5 mol/L) and the preconcentration factor was 250.After preconcentration,the linear range of FAAS for Pb(II) was 0.5～ 1.2×104 μg/L with a correlation coefficient of 0.9992 and the detection limit(3σ,n=11) was 0.04 μg/L.The molecular imprinting functional mesoporous silica was utilized to preconcentrate trace amount of lead ions in river,the relative standard deviation(RSD) of FAAS for six replicate analyses was better than 3%,and the recoveries were between 98.2% and 99.1%.The results are satisfactory.
【Key Words】： Molecular imprinting technique 2-Mercaptobenzothiazole Adsorption of heavy metal ion Flame atomic absorption spectroscopy Lead
【Fund】： 中南大学研究生科研创新项目(2010ssxt133)资助
【CateGory Index】： O657.31;O614.433
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