Plaguicidas organoclorados en aguas de captación para abastecimiento de la provincia de Salamanca

Pollution leveis and a time following-up of13organochlorinated pesticides residues in rawwaters forthe supply of6 townsofthe provinceofSalamancawere stu died, using gas chromatography. Amostfrecuently encountered group was thatofthethree hexachlorocyclohexane isomers(a-HCH, p-HCH and y-HCH), followed byheptachlorand a-endosulfan. Dieldrin and p.p'-DDTresidues were also detected. Individual and total maximumvalues determined did not exceed the maximum allowed concentrations stablished bythespanishregulation.