水玻璃中磷的直接测定

Direct Determination of Microphosphate in Water Glass

本文介绍一种硅、磷共存下磷的直接测定方法,此方法简单易行,具有一定的实用价值.其测定依据是:在一定量的钼酒酸根络离子和足够量的丙酮存在下,以磷钼酸根形式存在的PO_4^(-3)在λ=420nm处有吸收,而硅此时几乎不能形成硅钼酸,从而实现了磷、硅共存下的磷的直接测定.

In this paper,we introduce a new method of determining microphosphate in water glass. In this method we don't separate the macrosilicate. Using the spectrophotometry we can complete the determina-tion.