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首页> 外文期刊>Environmental toxicology and chemistry >MINERALIZATION OF POLYCYCLIC AND N-HETEROCYCLIC AROMATIC COMPOUNDS IN HYDROCARBON-CONTAMINATED SOILS
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MINERALIZATION OF POLYCYCLIC AND N-HETEROCYCLIC AROMATIC COMPOUNDS IN HYDROCARBON-CONTAMINATED SOILS

机译：碳污染土壤中多环和正杂环芳香族化合物的矿化作用

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The comparative mineralization of eight polycyclic aromatic compounds in five soils collected from an abandoned coal tar refinery in eastern Ohio was determined. The soils showed differences only in total extractable hydrocarbon content of the soil chemical characteristics measured. The compounds studied included five polycyclic aromatic hydrocarbons (phen-anthrene, anthracene, pyrene, and carcinogenic benz[a]anthracene and benzo[a]pyrene) and three N-heterocyclic aromatics (9H-carbazole, and carcinogenic 7H-dibenzo[c,g]carbazole and dibenz[a,j]acridine). Mineralization was measured by serum bottle radiorespirometry. Only phenanthrene, anthracene, pyrene, benz[a]anthracene, and carbazole were mineralized in the soils after 64 d. Two of the soils with eight to 15 times the hexane-extractable hydrocarbon content consistently showed more rapid initial rates and higher overall extents of mineralization compared to the other three soils. Overall extents of mineralization ranged from 38 to 55% for phenanthrene, 10 to 60% for anthracene, 25 to 70% for pyrene, background to 40% for benz[a]anthra-cene, and 25 to 50% for carbazole after 64 d. Extents of mineralization by indigenous soil microbiota appear to be more dependent on the chemical characteristics of the soil and not soil total biomass and activity. Cultures capable of degrading phenanthrene, anthracene, and pyrene were obtained following enrichment techniques. A Mycobacterium sp. capable of degrading these three compounds was isolated and reintroduced into two of the soils, resulting in mineralization enhanced above that of the indigenous soil microbial population. These data indicate that the future success of bioremediation methods relies on the characterization of environmental parameters affecting microbial degradation as well as the isolation of microbial populations that can reduce toxicity in the environment.
机译：确定了从俄亥俄州东部一个废弃的煤焦油精炼厂收集的五种土壤中八种多环芳族化合物的相对矿化作用。土壤仅在所测土壤化学特性的总可提取碳氢化合物含量方面显示出差异。研究的化合物包括5种多环芳烃（菲-蒽，蒽，pyr和致癌的苯并[a]蒽和苯并[a] re）和3种N-杂环芳族化合物（9H-咔唑和致癌的7H-二苯并[c， g]咔唑和二苯并[a，j] ac啶）。通过血清瓶放射呼吸法测量矿化度。 64天后，土壤中仅矿化了菲，蒽，pyr，苯并[a]蒽和咔唑。与其他三种土壤相比，其中两种土壤的己烷萃取烃含量为八到十五倍，始终显示出更快的初始速率和更高的矿化度。在第64天后，菲的总矿化程度范围为：菲的38％至55％，蒽的10％至60％，pyr的25％至70％，苯并[a]蒽的背景至40％，咔唑的25％至50％。 。本地土壤微生物群的矿化程度似乎更取决于土壤的化学特征，而不是土壤的总生物量和活性。通过富集技术获得了能够降解菲，蒽和pyr的培养物。分枝杆菌能够降解这三种化合物的物质被分离出来，并重新引入其中的两种土壤中，导致矿化作用增强，超过了土著土壤微生物种群。这些数据表明，生物修复方法的未来成功取决于对影响微生物降解的环境参数的表征以及可以降低环境毒性的微生物种群的分离。

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