Bioremedial potential of fenamiphos and chlorpyrifos degrading isolates: Influence of different environmental conditions
Bioremedial potential of fenamiphos and chlorpyrifos degrading isolates: Influence of different environmental conditions
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DOI：
10.1016/j.soilbio.2006.04.019
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发表时间：
2006-09
影响因子：
9.7
通讯作者：
B. Singh;A. Walker;D. Wright
中科院分区：
文献类型：
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作者：
B. Singh;A. Walker;D. Wright
以前分离的菌株毒死蜱和fenamiphos降解被用来检查其作为生物修复剂在土壤和水中含有农药残留的潜力。毒死蜱降解肠杆菌属和fenamidine降解财团迅速降解农药接种到自然和无菌水和土壤。降解速率较慢，在较低的pH值的土壤相比，自然和碱性土壤。土壤有机质对菌株的农药降解能力没有影响。土壤含水量小于最大持水量的40%时，降解速率减慢。在15 ~ 35°C温度范围内，菌株能快速降解灭线磷和毒死蜱，但在5 ~ 50°C温度范围内，降解能力急剧下降。两组细菌系统也能够去除一系列农药降解。需要104 cells/g-1土壤的接种密度才能开始快速生长和降解。接种前农药在土壤中的老化产生了相反的结果。菌胺磷的老化对接种的聚生体随后的降解没有影响。而毒死蜱经肠杆菌降解后，在土壤基质中的残留率仅为10%左右。毒死蜱的Koc值较高可能导致毒死蜱对降解菌的生物利用度较低。总之，本文证实了在不同的土壤和水的特性的生物修复潜力的杀线磷降解财团和毒死蜱降解细菌。
Previously isolated bacterial strains for chlorpyrifos and fenamiphos degradation were used to examine their potential as bioremedial agents in soils and water containing pesticide residues. Both, chlorpyrifos-degrading Enterobacter sp and fenamiphos-degrading consortium rapidly degraded pesticides when inoculated into natural and sterile water and soils. Degradation rate was slower in lower pH soils in comparison with natural and alkaline soils. Soil organic matter had no impact on pesticide degrading ability of isolates. Soil moisture <40% of maximum water-holding capacity slowed down degradation rate. The bacterial isolates were able to rapidly degrade fenamiphos and chlorpyrifos between 15 and 35°C but their degradation ability was sharply reduced at 5 and 50°C. Both groups of bacterial systems were also able to remove a range of pesticide degradation. An inoculum density of 104cellsg−1of soil was required for initiating rapid growth and degradation. Ageing of pesticide in soils prior to inoculation produced contrasting results. Ageing of fenamiphos had no impact on subsequent degradation by the inoculated consortium. However, degradation of chlorpyrifos by Enterobacter sp after aging resulted in persistence of ∼10% of pesticide in soil matrix. Higher Kocvalue of chlorpyrifos may have resulted in a lack of bioavailability of a smaller percentage of chlorpyrifos to degrading bacteria. Overall, this paper confirms bioremedial potential of a fenamiphos degrading consortium and a chlorpyrifos degrading bacterium under different soil and water characteristics.