离子液体[C_4 mim][PF_6]萃取-石墨炉原子吸收法检测食品中的痕量铅

The Determination of Lead by Graphit Furnace Atomic Absorption Spectrometry Couple with Ionic Liquid [C_4 min][PF_6]Extraction in Food

离子液体因其具有不挥发,粘度大等特性,已被广泛代替有机溶剂用于液液萃取。建立了以二乙基二硫代氨基甲酸钠(DDTC)为螯合剂、离子液体1-丁基-3-甲基咪唑六氟磷酸盐([C4mim][PF6])为萃取剂、稀硝酸为反萃取溶剂的萃取体系,并对所建立的萃取体系的相关影响因素进行了优化,包括:体系pH、螯合剂DDTC的用量、反萃取溶剂的选择等。同时对该离子液体是否可循环利用以及该体系的抗干扰能力进行了评价。此外,将所建立的离子液体萃取-稀硝酸反萃取体系结合石墨炉原子吸收分光光度法应用于大米,茶,鱼,小麦,蛤以及油菜中的痕量铅的检测。

The ionic liquid has replaced the organic solvent as the extraction solvent for it＇s including non-volatile and high viscosity .DDTC was selected as chelating agent ,[C4 mim][PF6 ] as the extraction agent and HNO3 as back-extraction agent .The optimized experimental condition was ：pH of the extraction , the concentration of DDTC ,the back-extraction solvent .Meanwhile ,recyclable of the ionic liquid and an-ti-interference were also discussed .Finally ,this method was successfully applied in the determination of the trace Pb existed in the rice ,tea ,fish ,wheat ,clam and rape .