硫代乙酰胺键合硅胶吸附剂的制备及对铜铅的吸附性能

制备了硫代乙酰胺键合硅胶(TAA-SG),并以它作为固相萃取吸附剂,通过火焰原子吸收光谱法(FAAS)研究了对Cu2+、Pb2+的萃取性能。系统考察了pH、振荡时间和吸附容量等静态吸附性能实验以及流速、洗脱液条件、最大试样体积和干扰离子等动态吸附性能实验对Cu2+、Pb2+定量回收的影响,确定了最佳吸附条件。实验结果表明,当介质的pH为5时,振荡25 min时吸附达到平衡,对Cu2+、Pb2+的最大吸附容量分别为15.05 mg/g和21.10 mg/g。TAA-SG用于饮用水中痕量Cu2+、Pb2+的吸附富集测定,加标回收率在98.4%~102.0%之间。

Preparation of Thioacetamide Modified Silica Gel and Its Application in the Extraction of Copper and Lead

A silica gel modified by thioacetamide as a solid-phase absorbent was synthesized.A silica gel modified by thuoacetamide as a solid-phase absorbent was synthesized,and its adsorption properties were investigated by flame atomic absorption spectrometry(FAAS).The influences of parameters,including pH value,shaking time and adsorption capacity in batch processes and flow rates of sample,eluent condition and sample volume in column processes,on the quantitative recovery of Cu2+ and Pb2+ were studied.Conditions for the effective extraction were optimized.In an aqueous medium of pH 5.0,the absorbent adsorbed Cu2+ and Pb2+ ion strongly and equilibrium of absorption was achieved by shaking for 25 min.The adsorptive capacity of Cu2+ and Pb2+ ion was 15.05 mg/g and 21.10 mg/g,respectively.This method has been applied in the determination of lead and copper in water samples,98.4%～102.0% recovery is obtained.