环境样品中痕量铁离子的吸附研究

摘要

采用电感耦合等离子体原子发射光谱法(ICP-AES)建立了预富集和测定环境样品中的痕量铁离子的分析方法.实验系统研究了溶液pH值、吸附时间、吸附剂用量、洗脱溶剂和比例等对铁离子测定结果的影响,最终确定了最佳分析条件.结果表明,最佳的富集酸度为pH=4.0,定量萃取时间仅为2.0min,该方法对铁离子的检出限为0.28 ng/mL,样品加标回收率在97%~102%.在最佳的分析条件下,铁的吸附容量为41.18mg/g,并且常规的共存离子并不干扰铁离子的测定.该方法已成功应用于环境样品中痕量Fe(Ⅲ)的检测,结果令人满意.该方法操作简单、快速,适用于环境样品中铁离子的测定.%A method was established for preconcentration and determination of trace Fe(Ⅲ)from environ-mental samples by inductively coupled plasma atomic emission spectrometry (ICP-AES).The influence of equilibrium temperature,equilibrium time and salts for propylene oxide measurement were investigated. The optimum pH value for the determination of Fe(Ⅲ)was 4.The shaking time was only 2 min.The limit of quantitation was 0.28 ng/mL,and the recovery was 97%~102%.The maximum static adsorption ca-pacity of the sorbent under optimum conditions was found to be 41.18 mg/g for Fe(Ⅲ).Common coexis-ting ions did not interfere with the separation and determination of Fe(Ⅲ).This simple,fast and reliable method has been successfully applied to the determination of Fe(Ⅲ)in environmental samples with satis-factory results.