POLAROGRAPHIC AND VOLTAMMETRIC DETERMINATION OF OSTACETATE-BLUE-P3R

The polarographic behaviour of anthraquinone dye Ostacetate Blue P3R i n a mixed water-ethanol (1:9) medium was investigated, and optimal con ditions were found for its determination by DC tast polarography in th e 20-700 mu mol l(-1) concentration range, by differential pulse polar ography at a dropping mercury electrode in the 1-70 mu mol l(-1) conce ntration range, as well as by differential pulse voltammetry at a hang ing mercury drop electrode in the 0.2-1 mu mol l(-1) concentration ran ge. The sensitivity of the determination can be further improved throu gh adsorptive accumulation of the test substance on the surface of the hanging mercury drop electrode; five minutes accumulation in unstirre d solution allows determination in the 0.02-1 mu mol l(-1) concentrati on range. Practical applicability of the newly developed methods in ri ver water was demonstrated. (C) 1997 Elsevier Science B.V.