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本刊1979年第7期刊登的“制备去离子水操作规程(草案)”中,阳、阴树脂再生后的淋洗,均采用在一定 pH 值范围内以对铬黑 T 指示剂(或试液)呈纯蓝色作为淋洗合格的指标之一,请问其原理和注意事项如何?答:阳树脂再生后淋洗时,用铬黑 T 指示剂(或试液)检查,目的是:检查阳树脂的活性基团(磺酸基)是否被再生液活化。如已活化则能除去水中的各种阳离子,使水对铬黑 T 指示剂(或试液)呈纯蓝色。
Published in the seventh issue of 1979 7 “Preparation of deionized water operating procedures (draft)”, the positive and negative resin regeneration after rinsing, are used in a certain pH range to chromium black T indicator ( Or test solution) was pure blue as one of the eluting indicators, what are the principles and precautions? A: When the resin after rinsing rinse, with a black T check indicator (or test solution), the purpose is : Check whether the active resin group (sulfonic acid group) of the cation resin is activated by the regeneration liquid. If activated, can remove a variety of cations in the water, the water on the chrome black T indicator (or test solution) was pure blue.