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首页> 外文期刊>Environmental Science & Technology >Can Physicochemical and Microbial Soil Properties Explain Enantiomeric Shifts of Chiral Organochlorines?
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Can Physicochemical and Microbial Soil Properties Explain Enantiomeric Shifts of Chiral Organochlorines?

机译：理化和微生物土壤特性能否解释手性有机氯的对映异构体位移？

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摘要

Enantiomeric fractions (EF) of PCB 95,132,149, and 174, α-HCH, o,p'-DDD, and o,p'-DDT were analyzed in 112 soil samples using two-dimensional gas chromatography and triple-quadrupole mass spectrometry. To assess the soil conditions that facilitate enantioselective fractionation of chiral compounds, EF values of selected PCBs were further correlated with a wide range of physicochemical and microbia! soil parameters in an attempt to identify the influential factors and their mutual relations. It was evident that soils where nonracemic ratios of investigated compounds were found were more carbon rich but they also contained significantly more humic and fulvic acids and total nitrogen. These specific physicochemical properties were accompanied by significantly increased values of all key biotic variables, the amount of microbial biomass, and its respiration activity (both basal and substrate-induced). Therefore, the shifts from racemic ratios appeared to be associated with more sustainable and active soil microflora. Among other abiotic characteristics, most significant differences were detected in the soil texture. Soil samples with significant shifts contained increased amount of clay component and correspondingly decreased proportion of sand fraction. These differences can also be associated with more intensive microbial activity, because clay content and texture with an increased amount of microaggregates are known to be favorable for soil microflora and its viability.
机译：使用二维气相色谱和三重四极杆质谱仪分析了112个土壤样品中的PCB 95,132,149和174，α-HCH，o，p'-DDD和o，p'-DDT的对映体组分（EF）。为了评估有利于手性化合物对映选择性分级分离的土壤条件，所选多氯联苯的EF值进一步与广泛的理化和微生物偏置相关联！土壤参数，以试图确定影响因素及其相互关系。显然，发现非外消旋化合物比例的土壤富含碳，但它们还含有更多的腐殖酸和富里酸和总氮。这些特定的理化特性伴随着所有关键生物变量，微生物生物量的数量及其呼吸活性（基础的和底物诱导的）的值显着增加。因此，外消旋比率的变化似乎与更可持续和活跃的土壤微生物区系有关。在其他非生物特征中，最明显的差异是土壤质地。具有明显变化的土壤样品中粘土成分的含量增加，而沙粒比例相应降低。这些差异也可能与更强的微生物活性有关，因为已知粘土含量和质地以及微骨料数量的增加有利于土壤微生物区系及其生存能力。

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