title: New DDT inputs after 30 years of prohibition in Spain. A case study in agricultural soils from south-western Spain.
abstract: This study provides information on the current status of contamination by DDT in agricultural soils in south-western Spain. A recent use of technical DDT in at least 17% of the soils was found based on the values (<1) of the ratio R(p,)(p')/(p,)(p') = [p, p'-DDE + p, p'-DDD]/[p, p'-DDT]. According to the ratio R₀,(p')/(p,)(p') = [o, p'-DDT]/[p, p'-DDT] , a dicofol type contamination was detected in about 27% of the soils. A wide range of concentrations was observed (0.08-11.1 ng/g d.w.) regardless of the type of crop soil. Enantiomeric fractions (EFs), based on the chiral analysis of o,p'-DDT residues differed from the racemic value (0.500) in most soils but they were not correlated with the study variables [DDTs], SOM, R(p,)(p')/(p,)(p') and R₀,(p')/(p,)(p'). Given the health risks posed by DDT, our findings support how the environmental control of legacy pollutants such as DDT cannot be neglected.
authors.affiliation: CSIC, Institute of Organic Chemistry, Department of Instrumental Analysis and Environmental Chemistry, Juan de la Cierva 3, 28006 Madrid, Spain.
authors.forename: Juan
authors.initials: J
authors.lastname: Muñoz-Arnanz
authors.forename: Begoña
authors.initials: B
authors.lastname: Jiménez
mesh_terms: D000383:Agriculture / Q000331:legislation & jurisprudence*; D003634:DDT / Q000032:analysis*; D004784:Environmental Monitoring / Q000331:legislation & jurisprudence; D007603:Jurisprudence; D010573:Pesticide Residues / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis*; D013030:Spain
chemical_list: D010573:Pesticide Residues; D012989:Soil Pollutants; D003634:DDT