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Enantioselective Kinetics of α‐Hexachlorocyclohexane in Earthworm ( Eisenia fedtia ) and Forest Soil
Author(s) -
Zhou Gaoxin,
Liu Donghui,
Ma Ruixue,
Li Jindong,
Sun Mingjing,
Zhou Zhiqiang,
Wang Peng
Publication year - 2012
Publication title -
chirality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.43
H-Index - 77
eISSN - 1520-636X
pISSN - 0899-0042
DOI - 10.1002/chir.22034
Subject(s) - earthworm , bioaccumulation , chemistry , enantiomer , environmental chemistry , hexachlorocyclohexane , enantioselective synthesis , chromatography , stereochemistry , pesticide , organic chemistry , ecology , catalysis , biology
ABSTRACT The enantioselective bioaccumulation and elimination behaviors of α‐hexachlorocyclohexane (α‐HCH) enantiomers in earthworm and soil were investigated by chiral gas chromatography. Enantiomer fraction values were calculated as indicators of the enantioselectivity. The mature earthworms were exposed to 0.10 µg g −1 wwt (0.14 µg g −1 dwt ) spiked soil continuously for the bioaccumulation, and the elimination was conducted after an enrichment period in the soil. The results showed that both the bioaccumulation and elimination processes followed monophasic kinetics, body residues of α‐HCH in earthworm increased to high level at the fifth day, and enantioselectivity was found in the bioaccumulation process with the rate constant (k) of 0.80 d −1 for (+)‐α‐HCH and 0.74 d −1 for (−)‐α‐HCH. The half life (t 1/2 ) of the enantiomers obtained in the elimination process was within one day. The bioaccumulation factors of steady state of α‐HCH enantiomers were 2.82 for (+)‐α‐HCH and 2.75 for (−)‐α‐HCH. The enantiomer fractions of earthworm and soil obviously below 0.5 during uptake and elimination processes indicate significant enantioselectivity and preferential depuration of (+)‐α‐HCH in earthworm. However, earthworms do not have a great capacity for getting rid of α‐HCH in polluted soil shown by a contradistinctive experiment. Chirality 24:615–620, 2012 . © 2012 Wiley Periodicals, Inc.