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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。
The thioacetamide bonded silica gel (TAA-SG) was prepared and its performance as a solid-phase extraction adsorbent was studied by flame atomic absorption spectrometry (FAAS). The effects of pH, shaking time and adsorption capacity on the static adsorption performance and the experimental results on the dynamic adsorption performance of Cu2 + and Pb2 + were investigated systematically. The optimal adsorption conditions were determined . The experimental results show that when the pH of the medium is 5, the equilibrium of adsorption is reached when the oscillation time is 25 min, and the maximum adsorption capacities of Cu2 + and Pb2 + are 15.05 mg / g and 21.10 mg / g, respectively. TAA-SG is used for the determination of trace amounts of Cu2 + and Pb2 + in drinking water. The recoveries are within the range of 98.4% -102.0%.