一、方法提要水法利用一个溶样,分别取出:以氟化物解络,铅盐型滴法测定铝;利用酸效应的选择性,控制 pH在0.8～1之间用 EDTA 直接滴定铁;在抗坏血酸存在下用酒石酸、氟化氢铵和氰化钾联合掩蔽 Al~(3+)、Fe~(2+)、Zn~(2+)、Mg~(2+),以铬黑 T 作指示剂用 EDTA 直接滴定锰;滴锰后用甲醛破蔽法络合滴定锌。其操作 First, the method summary Water method using a dissolved sample were removed: the fluoride solution network, lead salt drop method for the determination of aluminum; the use of acid selectivity, the control pH between 0.8 ~ 1 with EDTA titration of iron directly; in Al ~ (3 +), Fe ~ (2 +), Zn ~ (2 +), Mg ~ (2+) were masked by tartaric acid, ammonium bifluoride and potassium cyanide in the presence of ascorbic acid, EDTA direct titration of manganese; Dropping manganese complexation titration of zinc with formaldehyde method. Its operation