土壤中二价铁离子的伏安法测定  

DETERMINATION OF FERROUS IONS IN SOILS BYDIFFERENTIAL PULSE VOLTAMMETRY

作　　者：李清曼[1] 季国亮[1] 

机构地区：[1]中国科学院南京土壤研究所,南京210008

出　　处：《环境化学》2001年第6期582-587,共6页Environmental Chemistry

基　　金：国家自然科学基金(49831005;49971045);中国科学院重点项目(KZ952-J1-204)资助项目

摘　　要：利用二价铁离子的联吡啶络合物,示差脉冲伏安法测定土壤中的二价铁离子．结果表明:二价铁离子的浓度与铁联吡啶络合物的峰电流在１．６×１０－６－９．８×１０－６ｍｏｌ·ｌ－１和９．８×１０－６－６．６× １０－５ｍｏｌ·ｌ－１浓度范围内成正比,检测下限为４．１× １０－７ｍｏｌ·ｌ－１,相对标准偏差为０．８４%(ｎ＝６)．在该方法中,联吡啶的浓度对二价铁离子联吡啶络合物的峰电位、峰电流及半峰宽度有影响,而测定体系的ｐＨ值和支持电解质的浓度对二价铁离子联吡啶络合物的峰电位、峰电流及半峰宽度影响较小．This study attempted to determine ferrous ions through ferrous-bipyridyl chelate by differential pulse voltammetry. The results obtained showed that ferrous ion concentration was proportional to the peak current of ferrous-bipyridyl chelate in the ranges of 1.6 × 10 -6 to 9.8 × 10-6mol·l-1 and 9.8× 10-6 to 6.6 × 10-5mol·l-1, the detection limit was 4.1×10-7mol·l-1, the relative stan-dard deviation was 0.8% (ferrous ion concentration was 5.14×10-5mol·l-1, n = 6) . The pH value had no effect on peak potential, peak current, and half peak width of ferrous-bipyridyl chelate in the given range, but the concentration of bipyridyl had a great influence on those.

关 键 词：土壤监测 铁离子 示差脉冲伏安法 二价铁 

分 类 号：O657.1[理学—分析化学]