【多选题】【消耗次数：1】
EDTA返滴定法适用范围是
①
采用直接滴定法时，缺乏符合要求的指示剂，或者被测离子对指示剂有封闭作用
②
被测离子与EDTA的络合速度很慢
③
被测离子发生水解等副反应，影响测定
参考答案：
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