チオシアン酸鉄(III)錯イオンの生成とその吸光度測定に基づく極微量のチオシアン酸イオンのフローインジェクション分析

概要

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A flow-injection analysis has been developed for the determination of thiocyanate at 10^<-6>Mlevels, which is based on the photometric measurement of a thiocyanate-iron (III) complex formed in an acidic medium. The optimal conditions for the reaction of thiocyanate with iron (III) were established by varying concentrations of iron (III) and perchloric acid in a reaction solution. When a carrier of water and a reaction solution of 1.5×10^<-2> M Fe(NO_3)_3 in 0.04 M HClO_4 were each pumped at a flow rate of 0.8mιmin^<-1>, the response peak for thiocyanate appeared at about 20 second after sample solutio was injected into the carrier stream. The calibration graph for thiocyanate, plotted as height of the peak vs. concentration of thiocyanate, gave a straight line over 0∿1.2×10^<-5>M with a correlation coefficient of more than 0.999. The detection limit defined as S/N=3 was 2.1×10^<-7>M.
東海大学の論文