Determination of As(III) and As(V) in waters by chronopotentiometric stripping analysis

Abstract

Arsenic is a naturally occurring toxic and carcinogenic element. The degree of the toxicity depends on its chemical form and the concentration. Application of a sensitive, selective, simple and rapid method for detection and monitoring of different oxidation states of arsenic in waters is of great importance because main route of population exposure is through drinking water. In this work chronopotentiometric stripping analysis (CSA) was used for the determination of As(III) and As(V) in tap, well, river and rain waters from Vojvodina (Serbia). Gold film electrode on the glassy carbon support was used as the working electrode. The experimental parameters of the technique were investigated and optimized. Detection limit of the method for the electrolysis time of 600 s was 2 ?g/dm3 of As(III).Arsen je toksican i kancerogen elemenat koji se javlja u prirodi. Njegova toksicnost zavisi od hemijske forme n koncentracije. C obzirom da je najcesci nacin kontaminacije arsenom putem vode za pice, primena osetljive, selektivne, jednostavne i brze metode za detekciju i pracenje arsena u vodama je od velikog znacaja. U radu je primenjena tehnika hronopotenciometrijske strppipg analize (CSA) za odredjivanje As(III) i As(V) u bunarskoj, recnoj i vodi za pice, kao i kisnici sa teritorije Vojvodine (Srbija). Kao radna elektroda je primenjena tankoslojna zlatna elektroda na inertnom nosacu od staklastog ugljenika. Eksperimentalni uslovi tehnike su ispitani i optimizovani. Granica detekcije razvijene metode za vreme elektrolize od 600 s iznosila je 2 ?g/dm3 As(III). .