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Determination of Trace Sulfide In Atmosphhere and Water by Derivative Oscillopolarography

Wei Jinbao, Huang texiang, Zhang Lin, Lu Dayuan(Depart of Environo Sci. Wuhan University, Wuhan Environ. Monitoring Central Station)  
This paper reportes determination of trace sulfide In atmosphere and water by derivative os- cillopolarography. A sensitive derivative peak current is obtained in a system of 0.032mol/L EDTA-0.10mol/L sodium hydroxide-0.04mol/L ascorbic acid. The peak potential is at -0.70V(Vs.SCE). There is linear relationship betweeb the peak current and concentration of sulfide In the rang of 9.38×10~-9—5.16×10~-4mol/L. The Detection limit is 3.12×10~9mol/L. The result for the determi nation of trace sulfide In atmosphere and water is satisfactory. The mechanism of electrode process and current property has also been discussed.
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