微量钒的停流流动注射－动力学光度法测定

Stopped Flow Inductive Kinetic Spectrophotometric Method for the Determination of Trace Vanadium(Ⅳ)

依据Ｖ（Ⅳ）－Ｃｒ（Ⅵ）反应对Ｃｒ（Ⅵ）－Ⅰ－氧化还原反应的诱导，以淀粉络合物为指示剂建立了一种测定微量钒的停流－诱导动力学光度法．线性范围为０～１．８ｍｇ／Ｌ，方法检测限为０．００８ｍｇ／Ｌ．除Ｆｅ２＋、Ｓｂ３＋外，大部分共存离子不影响测定．测定了土样中钒含量，结果满意．

A stopped flow inductive kinetic spectrophotometric procedure is proposed for the determination of trace vanadium (Ⅳ) based on the inductive effect of it on the Cr(Ⅵ)-iodide redox reaction.The calibtation graph is linear for 0～1.8mg/L. Fe2+, Sb3+ interfere with the determination. The procedure is used for the determination of trace vanamum in soil,the recovery is 94.4%,and the relative standard deviation RSD<2.8%(n=6).