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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Identification of Recalcitrant Hydrocarbons Present in a Drilling Waste-Polluted Soil
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Identification of Recalcitrant Hydrocarbons Present in a Drilling Waste-Polluted Soil

机译：钻井废水污染土壤中顽固烃的鉴定

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During spills of hydrocarbons in soil, it has been observed that aliphatic and the slightly aromatic hydrocarbons are first to be removed, however, branched aliphatic and aromatic compounds, polycyclic aromatic hydrocarbons (PAHs) and their similar heteroatoms with sulfur (PAS) remain strongly absorbed to soil particles. It is important to point out that studies of biodegradation of alkyl-substituted PAHs and PAS are scarce and most of them have been carried out using only available standard compounds. The aim of this investigation was to identify and to quantify the aliphatic, alkyl polycyclic aromatic, and sulfured recalcitrant fractions present in a contaminated soil with drilling wastes. A modified method of shaking-centrifugation extraction was implemented for the extraction of compounds from contaminated soil. The organic extract obtained was purified and fractionated using aluminum oxide. Gas Chromatograph with flame ionization detector (GC-FID) and Gas Chromatograph with mass spectrometer detector (GC-MS) identified the aliphatic, PAHs and PAS fractions. Hydrocarbon composition in the soil contaminated with 140,000 mg TPHs/Kg soil, consisted in 80% of branched aliphatic compounds of C10 to C22, 15% of alkyl PAHs, and 5% of PAS compounds. Lineal, lineal branched, and cyclic branched aliphatic hydrocarbons, as well as their alkyl naphthalene, anthracene and phenantrene, methyldibenzothiophene, dimethyldibenzothiophene, and dimethylnaphto[2,3-b]thiophene compounds were identified by CG-MS. The identification of compounds in soil P31, allowed us to speculate on the origin of the contamination and the natural attenuation that had occurred at this site.
机译：在土壤中的碳氢化合物溢出过程中，已经观察到首先去除了脂肪族和稍带芳香族的烃，但是，支链的脂肪族和芳香族化合物，多环芳香族碳氢化合物（PAHs）及其与硫相似的杂原子（PAS）仍然被强烈吸收去土壤颗粒。重要的是要指出，对烷基取代的PAHs和PAS进行生物降解的研究很少，而且大多数仅使用可得的标准化合物进行了研究。这项研究的目的是鉴定和量化存在钻井废料污染土壤中的脂肪族，烷基多环芳族和硫化顽固级分。实施了一种改进的振动离心提取方法，用于从污染土壤中提取化合物。纯化获得的有机萃取物，并使用氧化铝分级分离。带有火焰离子检测器的气相色谱仪（GC-FID）和带有质谱检测器的气相色谱仪（GC-MS）可以识别脂肪族，PAHs和PAS馏分。被140,000 mg TPHs / Kg土壤污染的土壤中的碳氢化合物组成包括80％的C10至C22支链脂族化合物，15％的烷基PAHs和5％的PAS化合物。通过CG-MS鉴定了直链，直链支链和环状支链脂肪族烃，以及它们的烷基萘，蒽和菲，甲基二苯并噻吩，二甲基二苯并噻吩和二甲基萘[2,3-b]噻吩化合物。对土壤P31中化合物的鉴定，使我们能够推测污染的起源和在该地点发生的自然衰减。

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