Determination of Selenium(IV) Using o-Phenylenediamine by Differential Pulse Polarography/Interference of Metal Ions

Authors : Recai İNAM, Çiğdem TOPRAK

Pages : 299-310

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Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :A new sensitive and selective pulse polarographic method for the determination of Seinsert ignore into journalissuearticles values(IV); next to interfering ions is described. This method is based on the highly sensitive peak formed by the reaction of Seinsert ignore into journalissuearticles values(IV); with o-phenylenediamine in Britton-Robinson buffer solution insert ignore into journalissuearticles values(pH 2.5); at --0.08 V vs. SCE. The new peak due to the Seinsert ignore into journalissuearticles values(IV);/o-PDA complex not only prevents the interference of Pbinsert ignore into journalissuearticles values(II);, Cdinsert ignore into journalissuearticles values(II); and Sninsert ignore into journalissuearticles values(II); for selenium, but also increases its sensitivity. A linear calibration graph is obtained for Seinsert ignore into journalissuearticles values(IV); at a concentration of 5.0 x 10-8 to 6.8 x 10-5 M with a correlation coefficient of 0.9988. The proposed method showed good reproducibility and accuracy with a relative standard deviation of 5.5% and relative error of --5.6% for the determination of 5.0 x 10-8 M Seinsert ignore into journalissuearticles values(IV); next to 5.0 x 10-7 M Pbinsert ignore into journalissuearticles values(II);. There is no serious interference from some ions when present at levels more than 50 times that selenium and no need for separation or pre-concentration procedures, which are tedious, time-consuming and polluting.
Keywords : Selenium determination, o phenylenediamine, Interference`s problem, Polarography