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首页> 外文期刊>Journal of Contaminant Hydrology >Variability of chlorinated--solvent sorption associated with oxidative weathering of kerogen
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Variability of chlorinated--solvent sorption associated with oxidative weathering of kerogen

机译：与干酪根的氧化风化有关的氯化溶剂吸附变化

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摘要

The perchloroethylene (PCE) sorption distribution coefficient (K_d, measured at 40-100 μg/l solution concentration in batch experiments) ranged from 4.0 to 134 l/kg over the sampled thickness (1.0-6.0 m depth) of a moderately--low organic carbon (0.002-0.005), fractured and weathered diamict (poorly sorted, glacially deposited) aquitard. The organic carbon--normalized K_d (K_oc) for deeper, unoxidized (reduced) samples from this deposit (log K_oc = 4.4-4.59) were generally consistent with the kerogen in the underlying Devonian-age shale (log K_oc = 4.57), a likely source rock for these sediments. The similarities between these samples suggest that the sorption capacity of the kerogen was minimally altered during transport and deposition, and that humic substances were not co-deposited with the kerogen in the glacially--deposited sediments. The K_oc. within the diamict was correlated to the oxidation state of the organic matter, characterized by the H/O ratio through elemental analysis. The Ko_oc for more oxidized samples from shallower depth samples (log K_oc = 3.35-3.65) were approximately an order of magnitude less than those determined for the reduced samples.
机译：全氯乙烯（PCE）吸附分布系数（K_d，在批量实验中以40-100μg/ l的溶液浓度测量）在中等至低采样厚度（1.0-6.0 m深度）范围内为4.0至134 l / kg有机碳（0.002-0.005），断裂并风化的铁酰胺（分类不良，冰川沉积）的基克拉克。该矿床中较深，未氧化（还原）的样品的有机碳标准化K_d（K_oc）（log K_oc = 4.4-4.59）通常与下泥盆纪页岩中的干酪根一致（log K_oc = 4.57），这些沉积物可能是源岩。这些样品之间的相似性表明，干酪根的吸附能力在运输和沉积过程中变化很小，腐殖质并未与干酪根共沉积在冰川沉积的沉积物中。 K_oc。通过元素分析以H / O比为特征，将双酰胺中的铁离子与有机物的氧化态相关。来自较浅深度样品的更多氧化样品的Ko_oc（log K_oc = 3.35-3.65）大约比还原样品确定的Ko_oc小一个数量级。

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