超高灵敏显色反应乙基罗丹明B-磷钒钼杂多酸-PVA体系测定防火材料中痕量磷

Determination of trace phosphorus in fireproof materials by the super sensitive color reaction of the ethyl rhodamine B——heteropoly-molybdovanadophosphoric acid-PVA system

用乙基罗丹明B-磷钒钼杂多酸-PVA超高灵敏显色反应体系可在水相中直接 测定防火材料中痕量磷.测量波长586 nm,表观摩尔吸光系数为1.4×10~5L·mol^(-1)· cm-1.该法回收率92％～112％,对标准偏差为2.46％～6.32％.

A new super sensitive color system of ethyl rhodamine B(ERB)-heteropoly-molybdovanadophosphoric acid -PVA has been studied. The trace phosphorus in fireproof materials can be determined direetly in aqueous phase by use of the system. The maximum absorption wave of ion association is 586 nm,the apparent molar sbsorptivity is 1. 4×105 L ?mol-1 · cm-1. The recovery is 92%~112% and the relative standard deviation is 2. 46%~ 6.32%.