title: Indirect determination of dichlorodiphenyltrichloroethane (DDT) after dechlorination with magnesium/palladium bimetallic particles and potentiometric measurements.
abstract: 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.
authors.affiliation: Laboratório de Química Analítica e Ambiental, Instituto de Química, Universidade de Brasília, P.O. 4478, Brasília, DF 70.904-970, Brazil. amelia@unb.br
authors.forename: Maria Amélia A
authors.initials: MA
authors.lastname: Estrela
authors.forename: Jurandir R
authors.initials: JR
authors.lastname: SouzaDe
authors.forename: Sílvia C L
authors.initials: SC
authors.lastname: Dias
authors.forename: José G
authors.initials: JG
authors.lastname: Dórea
mesh_terms: 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
chemical_list: D010575:Pesticides; D010165:Palladium; D003634:DDT; D008274:Magnesium