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Indirect Determination of Dichlorodiphenyltrichloroethane (DDT) After Dechlorination with Magnesium/Palladium Bimetallic Particles and Potentiometric Measurements


Determination of chlorine ions of pesticides was performed after dechlorination reaction using a palladium/magnesium system. Chlorine ions were quantified by potentiometry with ion-specific electrode. Rates of dechlorination of 100 μg of DDT as a function of reaction time and percent (wt/wt) of palladium deposited on the magnesium particles were determined. The best reaction conditions to DDT dechlorination were achieved with an acetone/water (1:1) solution and DDT reaction with a 0.27% (wt/wt) palladium/magnesium bimetallic system at room temperature for 10 min. The detection limit was of 0.24 μg/mL. This low cost method showed an efficiency of 92% in determining chlorine ions derived from DDT, it is fast, requiring no specialized laboratory equipment.

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This project was supported by the Research Assistance Foundation of the Federal District (FAP/DF) (grant number 193.000.121/2004) and National Council for Scientific and Technological Development (CNPq) (grant number 1482624/2007-8).

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Correspondence to Jurandir R. SouzaDe.

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Estrela, M.A.A., SouzaDe, J.R., Dias, S.C.L. et al. Indirect Determination of Dichlorodiphenyltrichloroethane (DDT) After Dechlorination with Magnesium/Palladium Bimetallic Particles and Potentiometric Measurements. Bull Environ Contam Toxicol 84, 574–576 (2010).

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  • DDT
  • Bimetallic particles
  • Potentiometry