Abstract
The authors have studied on the promotion of repidity and reliability, and the simplification of the usual method The outline of precedure is as follows:-
(1) Sample is dissolved by HClO4 (60%) sol.
(2) After phosphorus in sample is oxidized, suturated KMnO4 sol. is added drop by drop and excess of KMnO4 is reduced by adding of little H2O2.
(3) Subsequently, phosphorus is precipitated by adding of HNO3, NH4NO3 and (NH4)2MoO4 sol.
(4) The following is entirely the same as the ordinary volumetric procedure.
