cerium (iv) has a catalytic effect on the very slow redox reaction between gallocyanine and bromate in acidic media. the reaction was monitored spectrophotometrically at 525 nm by a fixed time method of 4.0 rnin from initiation of the reaction. the decrease in absorbance at 525 nm is proportional to the ce (iv) concentration in the range of 0.005-1.000 and 1.00-10.00 pg. ml-l. the limit of dete...

vanadium is quantitatively retained on 2-nitroso-1-naphhthol-4-sulfonic acid tetradecyldimethlbenzyammonium chloride onto microcrystalline naphthalene in the ph range of 3.0-4.0 from a large volume of aqueous solutions of various alloys and synthetic samples. after filtration, the solid mass consisting of the vanadium complex and naphthalene was dissolved with 5.0 ml of dimethylformamide and th...