CHALCOGENIDE GLASS CHEMICAL SENSORS FOR DETERMINATION OF THALLIUM IN NATURAL AND WASTE-WATER

A Tl+-selective chalcogenide glass sensor developed in the Laboratory of Chemical Sensors of St. Petersburg University has been applied for potentiometric determination of thallium in natural and waste water sa mples collected in the highly polluted area of North Kazakhstan. It wa s found that in carbonate/hydrocarbonate-containing solutions at neutr al pH the thallium sensor exhibits near-linear response down to pTl 7 and is hardly influenced by interfering alkali, alkali-earth and heavy metal ions. A simple analytical procedure for thallium determination with a chalcogenide glass sensor can be used for environmental monitor ing of the polluted area.