AI Article Synopsis
- HPLC and HPLC-MS are the leading techniques for accurately analyzing organic phosphorus pesticides, with a study identifying 14 strains of bacteria capable of degrading methamidophos (MAP).
- The highest degradation rate recorded was 73% within 7 days, and the use of (31)P NMR helped identify different metabolites produced by the various bacterial strains.
- These strains were categorized into three groups, with Group A showing a complete breakdown of MAP and greater potential for application in environmental cleanup of both pesticide and heavy metal contamination.
Article Abstract
HPLC and HPLC-MS are the fastest and most accurate techniques for analysis of organic phosphorus pesticide (OPP) at the present time. Using these techniques, 14 strains of methamidopho (MAP) degrading-bacteria from the area contaminated with MAP have been identified. The results from HPLC and HPLC-MS analyses showed that the highest degradation rate was 73% after 7 days. In order to determine what metabolites will be formed after degradation, a key issue that has been neglected for a long time, we used ((31)P) NMR to track the degradation process. The results showed that different strains produced different metabolites. Ten strains were divided into three groups (groups A, B and C) by their metabolic profiling. Strains in group A degraded MAP into phosphor acid by breaking down all P-N, P-O and P-S bonds in 7 days. Strains in groups B and C had only broken down partially P-N and P-S bonds at the same time. Therefore, the bacterial strains in group A had a greater application potential than the other two groups. In addition, most metal phosphates are unsolvable in water. The analysis of X-ray showed, that the phosphate radicals generated by bacterial degradation induce crystallogenesis of heavy metal salts in water phase and also cause the chemical sedimentation of their crystals. Furthermore, these crystals are hydrogen phosphates. The results suggested that the MAP-degrading bacteria could be used for cleaning up not only the organic phosphorous pesticide contamination but also the phosphorous and heavy metal contamination in water environment simultaneously.
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| http://dx.doi.org/10.1007/s10661-006-9396-1 | DOI Listing |
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