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(一)前言百菌清催化剂中铝锌的测定,曾采用在抽提液中以过量碱沉淀Fe,而铝锌则溶于碱液中,在pH4～5时,用EDTA络合铝,再以NH_4F从EDTA铝中络合铝,用ZnSO_4标准液回滴析出的EDTA。锌的测定,则在抽提液中加入过量的碱,使铝锌都溶于
(A) Introduction Chlorothalonil catalyst for the determination of aluminum and zinc, had used in the extractive precipitation of excess alkali, and aluminum is soluble in alkali lye, pH4 ~ 5, with aluminum complexed with EDTA, and then Aluminum complexed with aluminum EDTA from NH4F and EDTA precipitated with ZnS04 standard solution. Zinc determination, then add excess alkali in the extract, so that aluminum and zinc are dissolved