Investigation of source apportioning for <tex>$\alpha$</tex>-HCH in air using enantioselective analysisInvestigation of source apportioning for <tex>$\alpha$</tex>-HCH in air using enantioselective analysis
Faculty of Pharmaceutical, Biomedical and Veterinary Sciences. Pharmacy
69(2007), p. 1701-1704
University of Antwerp
Passive air samples deployed throughout Europe were analysed for the enantiomers of α-HCH. When samples were divided according to their proximity to a large water body, Baltic samples had enantiomeric fractions (EFs) < 0.500, showing a consistent excess of the (-) α-HCH enantiomer, while the Mediterranean samples had predominantly EFs > 0.500. Similarly, Atlantic samples had EFs > 0.500 at latitudes < 50 degrees N, whereas at latitudes > 50 degrees N, EFs were largely < 0.500. Inland samples showed a large range in EF values; the highest α-HCH concentrations were racemic, whereas at lower α-HCH concentrations the spread in the EFs increased. Correlations between EFs and concentrations of α-HCH, α-HCH/γ-HCH ratios, latitude and longitude of the sampling locations suggest that enantiomeric analysis is a valuable tool to investigate source apportionment for chiral pollutants.