高锰焊剂中测定Al_2O_3时Mn干扰消除的探讨

ELEMINATION OF MANGANESE DISTUKBANCE WHILE DETERMINING Al_2O_3CONTENT OF HIGH MANGANESE BOUND FLUX

本文根据酸效应选择络合滴定的机理推导，并结合实验数据，证实了若控制滴定液的酸度在ｐＨ＜４．５，用ＥＤＴＡ直接滴定高锰焊剂中Ａｌ＿２Ｏ＿３，则Ｍｎ干扰消除，使终点突跃明显，易于掌握，且此法精密度高，适应性广．

Based on complexometric titration mechanism and experimental findings, it isproved that the elemination of manganese disturbance can be realised by means of EDTA di-rect titrating Al_2O_3 in high manganese bound flux if the titrate acidity is controlled as pH<4.5. This means is handy for operation due to a visible abrupt end point and high in precisionso as to be widely applicable.