镨、钕量法测定有机磷化合物中的磷含量

DETERMINATION OF PHOSPHORUS IN ORGANIC COMPOUNDS BY USING Pr(NO_3)_3AND Nd(NO_3)_3

有机磷化合物中的磷含量可以先将样品放入氧瓶燃烧分解,再以Pr(NO_3)_3或Nd(NO_3)_3作为PO_4^(3-)的沉淀剂,并用EDTA回滴过量的Pr^(3+)或Nd^(3+)来测定。文中还介绍了消除氟,硫,硼干扰的简单方法。测定误差为±0.20%。

This paper presents a simple and accurate method for indirect complex-ometric determination of phosphorous in organic compounds.This method is based on thefact that PO_4~3^- reacts with Pr^(3+) or Nd^(3+) to form PrPO_4 or NdPO_4,and the excess amountof Pr^(3+) or Nd^(3+) is titrated with EDTA,even in the presence of the precipitate.Interferen-ces of F,S,B can be eliminated by a simple procedure.The maximum error is±0.20%.