Enrichment and Microbial Degradation of 2,4,6-trinitrotoluene (TNT) in Four Aquatic Products
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Abstract:
To ensure the safety of aquatic products, an efficient extraction method for 2,4,6-trinitrotoluene (TNT) was established in this study. The TNT enrichment ability of four commercially available aquatic products: Ruditapes philippinarum, Mactra veneriformis Reeue, Solen strictus and Mercenaria mercenaria was analyzed by high performance liquid chromatography (HPLC). The TNT pollutants in water were degraded efficiently by microorganisms. The results showed that the extraction rate of this method reached 97.80%. Among the four aquatic products, Ruditapes philippinarum, Mactra veneriformis Reeue, Mercenaria mercenaria could accumulate TNT to different extents, with Mactra veneriformis having the highest concentration of accumulated TNT (76.26 ng/g). In order to degrade TNT pollutants in water, 9 aromatic compounds-degrading natural strains were selected for the biodegradation of TNT. The results showed that all the 9 natural strains could degrade TNT, with H5, LM1, and CT1 exhibiting higher efficiency, especially Vibrio H5 (which had the highest degradation efficiency, 80.90%, at 27 ℃ for 9 h). In this study, a simple, efficient and reproducible extraction-detection procedure with a good application prospect was established. In the meantime, the biodegradation method could efficiently removed TNT pollutants in water without secondary pollution, thereby ensuring the safety of water bodies.
