催化光度返滴定法测定微量锰的研究  

Study on Catalytic Spectrophotometric Back Titrimetry for Determining Trace Manganese

作　　者：秦永惠[1] 李潞铭[1] 王芳 

机构地区：[1]河北大学化学系

出　　处：《分析试验室》1997年第3期68-71,共4页Chinese Journal of Analysis Laboratory

摘　　要：本文研究了催化光度返滴定法测定微量锰的原理，找到最佳实验条件，确立了实验方法。测定波长６２２ｎｍ；反应时间１ｍｉｎ４０ｓ；活化剂ＮＴＡ用量０．６０ｍＬ；ＫＩＯ４与孔雀石绿用量比为１．００∶０．３５；室温下滴定；用ｐＨ＝５．４的乙酸－乙酸钠缓冲溶液控制溶液酸度；测定Ｍｎ２＋的浓度范围为１×１０－７～１×１０－５ｍｏｌ／Ｌ；Ｃｏ２＋、Ｂｉ３＋、Ｃａ２＋、Ａｌ３＋、Ｐｂ２＋、Ｃｕ２＋、Ｚｎ２＋、Ｆｅ２＋、Ｍｇ２＋等离子均不干扰测定。该法具有较高灵敏度和准确度。试用于黄豆和化学试剂ＭｇＳＯ４中锰的测定，结果令人满意。In this article the catalytic spectrophotometric back titrimetry for determining trace manganese was studied,best experimental conditions were selected and experimental method was established.The determination wavelength is 622nm and the reaction time is 1min 40sec.The volume of activating agent NTA is 0.60mL.Volume ratio between KIO 4 and malachite green is 1.00∶0.35.The titration is done at room temperature with the acidity of solution controled by HAc NaAc buffer solution(pH=5 4).The concentration range for determining manganese is 1×10 -7 ～1×10 -5 mol/L Co 2+ 、Bi 3+ 、Ca 2+ 、Al 3+ 、Pb 2+ 、Cu 2+ 、Zn 2+ 、Fe 2+ and Mg 2+ do not interfere with the determination.This method has higher sensitivity and accuracy.Manganese in soybean and chemical agent MgSO 4 was determined with satisfactory results.

关 键 词：催化 光度返滴定法 锰 

分 类 号：O614.711[理学—无机化学]