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 R o , 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 R o , 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.
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