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为了测定水中痕量的磷酸盐,作者对钼酸盐-孔雀石绿分光光度法进行了改进,通过最佳条件的选择,建立了一种灵敏的测定水中痕量磷酸盐的方法。该法是基于在硫酸介质中及水浴(90℃以上)加热的条件下,将水中凝聚磷酸盐水解为正磷酸盐,然后进一步与钼酸铵及孔雀石绿反应生成蓝色的络合物,它在650nm处有最大吸收,加入聚乙烯醇可使反应产物至少稳定一天。本法应用于自来水及河水中
In order to determine trace amounts of phosphate in water, the authors improved molybdate-malachite green spectrophotometry and established a sensitive method for the determination of trace phosphate in water by selecting the best conditions. The method is based on the sulfuric acid medium and water bath (90 ℃ above) under the conditions of hydrolysis of condensed water phosphate orthophosphate, and then further ammonium molybdate and malachite green to form a blue complex, It has a maximum absorption at 650 nm and addition of polyvinyl alcohol stabilizes the reaction for at least a day. This Law applies to tap water and river water