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在现有的一些测定钡的比色法中,用偶氮氯膦Ⅲ作显色剂的方法,有较好的灵敏度和选择性,但是这个方法要受钙、镁等离子的干扰,因而不能商接用于水中微量钡的测定。 Bouquiaux等曾报导用EDTA溶液自铵式强酸性阳离子交换树脂上淋洗分离钙、锶、钡的方法。Christova等则报导过用硫酸铵溶液淋洗分离镁,钙、锶的方法。我们参考这些工作,提出了以EDTA和氯化铵的溶液为淋洗液,较快地使钡与钙、镁等干扰离子分离的
In some existing barium colorimetric assay, the method of using chlorophosphonazo III as a color reagent has better sensitivity and selectivity, but this method is subject to the interference of calcium and magnesium ions, and therefore can not be traded Then for the determination of trace amounts of barium in water. Bouquiaux et al. Have reported a method of leaching and separating calcium, strontium, and barium from an ammonium strongly acidic cation exchange resin using an EDTA solution. Christova et al. Reported the method of leaching and separating magnesium, calcium and strontium with ammonium sulfate solution. With reference to these efforts, we propose to use EDTA and ammonium chloride solutions as eluent to quickly separate barium from interfering ions such as calcium and magnesium