TY - JOUR
T1 - Binding of [14C]parathion in soil
T2 - A reassessment of pesticide persistence
AU - Katan, J.
AU - Fuhremann, T. W.
AU - Lichtenstein, E. P.
PY - 1976
Y1 - 1976
N2 - A steady decrease of extractable [14C]parathion residues in soils over a 1-month incubation period was accompanied by an increase of unextractable, bound 14C-labeled residues, resulting finally in total recoveries of extracted plus bound residues of 80 to 87 percent of the applied radiocarbon. Soils containing bound residues were nontoxic to fruit flies. Binding of 14C-labeled residues was related to the activity of soil microorganisms; soil sterilization resulted in a reduction of binding by 58 to 84 percent. Under flooded (anaerobic) conditions, the binding of compounds labeled with 14C doubled, and parathion was reduced to aminoparathion. Reinoculation of sterilized flooded soil fully reinstated the binding capacity. [14C]Aminoparathion was preferentially bound to soil, since its binding within 2 hours was 30 times greater than that of [ 14C]parathion. Because of the existence of formerly "unseen," unextractable residues, the concept of " persistent" and "nonpersistent" pesticide residues might have to be reconsidered.
AB - A steady decrease of extractable [14C]parathion residues in soils over a 1-month incubation period was accompanied by an increase of unextractable, bound 14C-labeled residues, resulting finally in total recoveries of extracted plus bound residues of 80 to 87 percent of the applied radiocarbon. Soils containing bound residues were nontoxic to fruit flies. Binding of 14C-labeled residues was related to the activity of soil microorganisms; soil sterilization resulted in a reduction of binding by 58 to 84 percent. Under flooded (anaerobic) conditions, the binding of compounds labeled with 14C doubled, and parathion was reduced to aminoparathion. Reinoculation of sterilized flooded soil fully reinstated the binding capacity. [14C]Aminoparathion was preferentially bound to soil, since its binding within 2 hours was 30 times greater than that of [ 14C]parathion. Because of the existence of formerly "unseen," unextractable residues, the concept of " persistent" and "nonpersistent" pesticide residues might have to be reconsidered.
UR - http://www.scopus.com/inward/record.url?scp=0017103197&partnerID=8YFLogxK
U2 - 10.1126/science.948750
DO - 10.1126/science.948750
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C2 - 948750
AN - SCOPUS:0017103197
SN - 0036-8075
VL - 193
SP - 891
EP - 894
JO - Science
JF - Science
IS - 4256
ER -