Bioremediation of chlorinated pesticides in field-contaminated soils and suitability of Tenax solid-phase extraction as a predictor of its effectiveness
Bioremediation of chlorinated pesticides in field-contaminated soils and suitability of Tenax solid-phase extraction as a predictor of its effectiveness
Bioremediation of chlorinated pesticides in field-contaminated soils and suitability of Tenax solid-phase extraction as a predictor of its effectiveness
Autor
Baczyński, Tomasz
Pleissner, Daniel
Kryłów, Małgorzata
Data powstania
2011
Język
angielski
Słowa kluczowe
bioavailability, DDT, lindane, methoxychlor
Abstrakt
Results of desorption kinetics study using consecutive Tenax TA solid phase extraction were tested as predictors of 3-week anaerobic soil bioremediation effectiveness for chlorinated pesticides γ-HCH, DDT and methoxychlor. Field-contaminated samples were used in these experiments. Estimation of rapidly desorbing fractions using two-compartment model of desorption kinetics has shown that amounts of pesticides removed during bioremediation tests (43-98% of initial concentrations) were considerably larger (1.37 ± 0.45 times) than these fractions. However, both values were correlated to some extent (R2 = 0.6355). In all, determination of rapidly desorbing fractions was considered rather a poor indicator of soil bioremediation efficiency for chlorinated pesticides. The total amounts of pesticides desorbed by Tenax in 72 h performed better in this respect (R2 = 0.7274, fraction removed/desorbed = 1.10 ± 0.20). Disappearance of DDT during bioremediation was accompanied by DDD formation but the latter was considerably lower than results expected from stoichiometry.
