Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Development of microbial degradation of cypermethrin and diazinon in organically and conventionally managed soils.
AU - Fenlon, Katie A.
AU - Jones, Kevin C.
AU - Semple, Kirk T.
N1 - Joint Meeting on Sources, Fate, Behaviour and Effects of Organic Chemicals at the Regional and Global Scale, Lancaster, ENGLAND, SEP, 2006
PY - 2007
Y1 - 2007
N2 - The behaviour of pesticides in the soil is a complex issue and is controlled by the physical, chemical and biological properties of the soil. The ability of microorganisms to degrade pesticides is not only controlled by the bioavailability of a chemical but also by their capacity to develop the ability to utilise available chemicals. The development of catabolism in the indigenous soil microflora of four organically and one conventionally managed soils was investigated for two pesticides: cypermethrin and diazinon. Soils were amended with cypermethrin and diazinon and aged for 0, 2, 4, 6, 8, and 14 weeks and, at each time point, mineralisation of freshly added (14) C-cypermethrin or (14) C-diazinon was measured by trapping (14) CO2. In general, contact times between the soil and the pesticide resulted in a reduction in the lag phase (the period of time before mineralisation exceeded 5% of the added activity), followed by increases in the extent of mineralisation. Cypermethrin was mineralised signifi. cantly in all soils; whereas, diazinon was only appreciably mineralised in two of the soils, most notably in the organic soil from Redesdale. Statistical analysis showed pH and organic matter content of the soil had a significant effect on the extent of mineralisation (P <= 0.05) of the cypermethrin in the soils.
AB - The behaviour of pesticides in the soil is a complex issue and is controlled by the physical, chemical and biological properties of the soil. The ability of microorganisms to degrade pesticides is not only controlled by the bioavailability of a chemical but also by their capacity to develop the ability to utilise available chemicals. The development of catabolism in the indigenous soil microflora of four organically and one conventionally managed soils was investigated for two pesticides: cypermethrin and diazinon. Soils were amended with cypermethrin and diazinon and aged for 0, 2, 4, 6, 8, and 14 weeks and, at each time point, mineralisation of freshly added (14) C-cypermethrin or (14) C-diazinon was measured by trapping (14) CO2. In general, contact times between the soil and the pesticide resulted in a reduction in the lag phase (the period of time before mineralisation exceeded 5% of the added activity), followed by increases in the extent of mineralisation. Cypermethrin was mineralised signifi. cantly in all soils; whereas, diazinon was only appreciably mineralised in two of the soils, most notably in the organic soil from Redesdale. Statistical analysis showed pH and organic matter content of the soil had a significant effect on the extent of mineralisation (P <= 0.05) of the cypermethrin in the soils.
U2 - 10.1039/b700668c
DO - 10.1039/b700668c
M3 - Journal article
VL - 9
SP - 510
EP - 515
JO - Journal of Environmental Monitoring
JF - Journal of Environmental Monitoring
SN - 1464-0325
IS - 6
ER -