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试述抗坏血酸还原—钼蓝分光光度法测定五氧化二磷的原理。

问答题
2023-03-20 16:58
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正确答案

采样后,加水与五氧化二磷作用生成正磷酸。在酸性介质中及有锑盐存在下,正磷酸与钼酸铵反应生成磷钼杂多酸,用抗坏血酸还原为蓝色的络合物,根据颜色深浅,用分光光度法测定。


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