循环水总磷测定中发色酸度的新探讨

The New Discussion of Acidity in the Detection of Circulating Water Total Phosphor

化工循环水中常加入一种含有机磷的水质稳定剂,用以灭菌、缓蚀和阻垢,故循环水中总磷含量的控制常是化工控制分析的重要项目,通过分析PO43-,可了解水垢缓蚀剂有效成分的变化情况,若PO34-过高,易引起磷酸三钙沉淀,难于消除。因此精确测定磷的含量成了至关重要的问题。目前工业循环水总磷的测定方法中对消解后的水样没有调节pH值,但据有关资料介绍,pH值的大小会对测定的结果产生影响,酸度过高会导致在显色阶段形成的磷钼酸盐分解,近而导致测定结果偏低,本文在此基础上提出"三点测试法"以判断最佳的酸度。

The detection of circulating water total phosphorus is on important index in the commanding process of chemical analysis. By phosphate analysis, we can realize the varying condition of furring nhibitor, if the content of phosphate is high, tricalcium phosphate is easy to produced and not eliminated. This paper based on the three test ＂forward＂ to determine optimal acidity.