a facile catalytic- kinetic method for the determination of selenium (iv)

a catalytic-kinetic method for the determination of selenium is proposed. alizarin navy blue is reduced by sodium sulfide to from a colorless product. the reaction is accelerated by trace amounts of se (iv), and can be followed by measuring the decrease in absorbance of the dye at 620nm and 30 °c by the fixed time method. selenium can be determined in the range of 0.004 — 0.12 1.1g.m1-1 . the detection limit is 0.03 ng.m1-1 se (iv). the relative standard deviation for 0.08, and 0.11,tg.m1-1 : se (iv) was 2.2%, and 1.8%, respectively. the method is free from most interferences and it was applied to determination of selenium in water real samples