新型功能材料用于环境水样中痕量锑元素的检测

Application of New Functional Materials for Determination of Trace Antimony in Water Samples

为准确测定环境水体中的痕量锑(Sb),采用聚乙烯醇与硫代乙醇酸合成的酯化物经七水硫酸亚铁絮凝制备功能材料对环境水体中的痕量锑进行富集浓缩,并结合火焰原子吸收分光光度计进行检测。实验结果表明,功能材料对Sb最佳吸附pH为6、吸附过程符合Langmuir方程与准二级动力学反应方程,吸附过程以单分子层吸附与化学吸附为主,最大吸附量为232.56μg/mg;在固相萃取柱填充0.02 g功能材料对25 mL.5μg/mL Sb溶液以1.04 mL/min流速富集,采用10%的磷酸作为洗脱剂以1.25mL/min对功能材料富集Sb洗脱,进行12次平行实验得固相萃取柱对.溶液中Sb去除率RSD为1.78%,洗脱率RSD为4.62%,回收率RSD为4.23%,平均回收率为97.42%。对实际环境水样进行预处理后用填充功能材料的固相萃取柱富集浓缩,测得实际水样中Sb含量为0.86μg/L。

To accurately determine trace antimony(Sb)in environmental water,the ester synthesized by polyvinyl alcohol and thioglycolic acid by flocculation of ferrous sulfate heptahydrate were used to prepare functional materials to enrich and detect trace antimony in environmental water in combination with flame atomic absorption spectrophotometer.The optimal pH value for functional materials to adsorb Sb was 6.The adsorption process conformed to the Langmuir equation and quasi second-order kinetic equation.The adsorption process was dominated by monolayer adsorption and chemical adsorption,and the maximum adsorption capacity was 232.56μg/mg.The solid-phase extraction column was illed with 0.02 g functional material to enrich Sb solution(volume of 25 mL.and concentration of 5μg/mL)at the flow rate of 1.04 mL/min,and 10%phosphoric acid(elution agent)was used to elute Sb at the flow rate of 1.25 mL/min.After 12 parallel experiments,the RSD of Sb removal efficiency in the solid-phase extraction column was 1.78%.The RSD of elution rate was 4.62%,the RSD of recovery rate was 4.23%,and the average recovery rate was 97.42%.The actual water samples were pretreated and then concentrated by solid-phase extraction column filled with functional materials.The concentration of Sb was 0.86μg/L.