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 microg 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 microg/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.
Estrela
Maria Amélia A
MA
Laboratório de Química Analítica e Ambiental, Instituto de Química, Universidade de Brasília, P.O. 4478, Brasília, DF 70.904-970, Brazil. amelia@unb.br
SouzaDe
Jurandir R
JR
Dias
Sílvia C L
SC
Dórea
José G
JG
D003634:DDT / Q000032:analysis* / Q000737:chemistry; D004784:Environmental Monitoring; D004787:Environmental Pollution / Q000032:analysis*; D052918:Environmental Restoration and Remediation / Q000379:methods; D054879:Halogenation; D057230:Limit of Detection; D008274:Magnesium / Q000737:chemistry*; D010165:Palladium / Q000737:chemistry*; D010575:Pesticides / Q000737:chemistry*; D011199:Potentiometry
D010575:Pesticides; D010165:Palladium; D003634:DDT; D008274:Magnesium