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铝的络合滴定通常采用EDTA作螯合剂、氟化钠(钾)为置换剂、以二甲酚橙指示剂的锌盐(或铅盐)返滴定法。但因铝在微酸介质中,易生成多羟基络合物,故该法在室温下难以使铝与EDTA络合完全,因而需要加热煮沸,而且锡、钨、钼等离子有较大的影响。三乙四胺六乙酸(TTHA)是一种具有10个配位原子的螯合剂,我们观察到TTHA作为铝的螯合剂的非常特异的性质,在室温下它能与铝迅速生成稳定的
Complexometric titration of aluminum usually uses EDTA as a chelating agent, sodium fluoride (potassium) as a displacer, and a zinc salt (or lead salt) back-titration method of xylenol orange indicator. However, due to aluminum in a slightly acidic medium, easy to generate polyhydroxy complexes, so the law at room temperature is difficult to make aluminum and EDTA complexation, and therefore need to heat boil, and tin, tungsten, molybdenum and other ions have a greater impact. Triethylenetetraamine hexaacetic acid (TTHA) is a chelator with 10 coordination atoms. We have observed that TTHA, as a very specific property of aluminum chelators, can rapidly form stable