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Effects of Interfaces of Goethite and Humic Acid-Goethite Complex on Microbial Degradation of Methyl Parathion

机译：针铁矿与腐殖酸-针铁矿配合物的界面对甲基对硫磷微生物降解的影响

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Microbial degradation plays an essential role in the removal of hydrophobic organic compounds (HOCs) dispersed in soil and sediment, and its performance is greatly affected by mineral particles which regulate HOCs bioavailability by interfacial adsorption. Likewise, bacteria cells attach to the surfaces of mineral particles as well but how bacterial attachment affects biodegradation is largely unknown. Here we report inhibitory effects of goethite and humic acid (HA)-goethite complex addition on microbial degradation of methyl parathion (MP). Using attenuated total reflectance-Fourier transform infrared spectroscopy, we observed that the adhesion of bacterial cells responsible for MP degradation on goethite occurred and the adhesive strength increased over time. We then replaced goethite with phosphate-adsorbed goethite to weaken the goethite-bacteria association and the inhibition of MP biodegradation was alleviated. These results suggested the formation of goethite-bacteria association hinder MP biodegradation. Meanwhile, our results showed that HA coating prevented bacterial attachment on goethite particles along with a drastically increased MP adsorption by goethite. The combined effect would lead to decreased mass fluxes of MP to bacterial cells and could represent another mechanism responsible for the decreased degradation rate observed in the current study.
机译：微生物降解在去除分散在土壤和沉积物中的疏水性有机化合物（HOC）中起着至关重要的作用，其性能受到矿物颗粒的影响，这些颗粒通过界面吸附调节HOC的生物利用度。同样，细菌细胞也附着在矿物质颗粒的表面上，但是细菌附着如何影响生物降解的机制很大程度上还是未知的。在这里，我们报告针铁矿和腐殖酸（HA）-针铁矿复合物添加对微生物对甲基硫磷（MP）的抑制作用。使用衰减的全反射-傅立叶变换红外光谱法，我们观察到负责MP降解的细菌细胞在针铁矿上的粘附发生，并且粘附强度随时间增加。然后，我们用磷酸盐吸附的针铁矿代替针铁矿，以减弱针铁矿与细菌的缔合，从而减轻了MP生物降解的抑制作用。这些结果表明针铁矿-细菌缔合的形成阻碍了MP的生物降解。同时，我们的结果表明，HA涂层可防止细菌附着在针铁矿颗粒上，同时针铁矿对MP的吸附也大大增加。结合的作用将导致MP进入细菌细胞的质量通量降低，并且可能代表造成当前研究中降解率降低的另一种机制。

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