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首页> 外文期刊>Environmental Science & Technology >In Situ and Laboratory Determined First-Order Degradation Rate Constants of Specific Organic Compounds in an Aerobic Aquifer
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In Situ and Laboratory Determined First-Order Degradation Rate Constants of Specific Organic Compounds in an Aerobic Aquifer

机译：有氧含水层中特定有机化合物的原位和实验室确定的一阶降解速率常数

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摘要

In situ microcosms (ISM) and laboratory batch microcosms (LBM) were used for determination of the first-order degradation rate constants of benzene, toluene, o-xylene, nitrobenzene, naphthalene, biphenyl, o- and p-dichlorobenzene, 1,1,1-trichloroethane, tet-rachloromethane, trichloroethene, tetrachloroethene, phenol, o-cresol, 2,4- and 2,6-dichlorophenol, 4,6-o-dichlorocresol, and o- and p-nitrophenol in an aerobic aquifer. All aromatic hydrocarbons were degraded in ISM and LBM experiments. The phenolic hydrocarbons were all degraded in ISM experiments, but some failed to degrade in LBM experiments. Chlorinated aliphatic hydrocarbons were degraded neither in ISM nor LBM experiments. Degradation rate constants were determined by a model accounting for kinetic sorption (bicontinuum model), lag phases, and first-order degradation. With a few exceptions, lag phases were less than 2 weeks in both ISM and LBM experiments. First-order degradation rate constants for aromatic and phenolic hydrocarbons ranged between 0.01 and 0.9 day~(-1). Local variations in first-order degradation rates and variations between rate constants determined by ISM and LBM were generally within a factor of 5, but no systematic differences were observed between rate constants determined in situ and in the laboratory.
机译：使用原位缩微（ISM）和实验室批量缩微（LBM）测定苯，甲苯，邻二甲苯，硝基苯，萘，联苯，邻和对二氯苯的一级降解速率常数，1,1在好氧含水层中的1,1-三氯乙烷，四氯乙烷，三氯乙烯，四氯乙烯，苯酚，邻甲酚，2,4-和2,6-二氯苯酚，4,6-邻二氯甲酚以及邻硝基和对硝基苯酚。在ISM和LBM实验中，所有芳烃均被降解。酚烃在ISM实验中均被降解，但有些在LBM实验中未降解。氯化脂族烃在ISM和LBM实验中均未降解。降解速率常数由考虑动力学吸附的模型（双连续谱模型），滞后阶段和一级降解确定。除少数例外，在ISM和LBM实验中，延迟阶段均少于2周。芳烃和酚类烃的一级降解速率常数在0.01和0.9天〜（-1）之间。一阶降解速率的局部变化以及由ISM和LBM确定的速率常数之间的变化通常在5倍以内，但在现场和实验室确定的速率常数之间未观察到系统差异。

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