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首页> 外文期刊>Environmental Science & Technology >Bioavailability of Naphthalene Sorted to Cationic Surfactant-Modified Smectite Clay
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Bioavailability of Naphthalene Sorted to Cationic Surfactant-Modified Smectite Clay

机译：萘在阳离子表面活性剂改性蒙脱石粘土中的生物利用度

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摘要

The bioavailability of naphthalene sorbed to hexa-decyltrimethylammonium (HDTMA)-modified smectite clay was evaluated by modeling naphthalene mineralization kinetics in dilute clay slurries and in clay-free controls. Sorbed naphthalene was directly available to Pseudomonas putida strain 17484, as evidenced by initial rates and extents of naphthalene mineralization that significantly exceeded predicted values assuming sorbed naphthalene was unavailable. For the soil isolate, Alcaligenes sp. strain NP-Alk, sorbed naphthalene was unavailable, and measured rates agreed closely with predicted rates. For this bacterium, sorbed naphthalene was available only upon its desorption from the HDTMA-modified smectite. This desorption was very rapid from unaggregated HDTMA-smectites and from HDTMA-clay aggregates of less than 0.25-mm diameter. Naphthalene mineralization in the presence of larger clay aggregates (0.25— 1-mm diameter) was desorption rate limited. Contaminants sorbed to HDTMA-modified soils or clays should be largely bioavailable to bacteria, since the desorption rates from these materials are high and some degradative bacteria have the ability to directly utilize the sorbed contaminants.
机译：通过对稀粘土浆液中和不含粘土的对照组中萘的矿化动力学进行建模，评估了吸附到六癸基三甲基铵（HDTMA）改性蒙脱石粘土上的萘的生物利用度。假想假单胞菌菌株17484可以直接获得吸附的萘，这是通过假设萘的矿化率和初始程度明显超出预测值（假设无法利用吸附的萘）证明的。对于土壤分离物，Alcaligenes sp.。无法获得NP-Alk菌株，吸附的萘，并且测得的速率与预测的速率紧密一致。对于这种细菌，只有从HDTMA修饰的蒙脱石上解吸后才能得到吸附的萘。从未聚集的HDTMA蒙脱石和直径小于0.25 mm的HDTMA粘土聚集体中解吸非常快。存在较大粘土聚集体（直径0.25-1 mm）时萘的矿化作用受解吸速率的限制。吸附到HDTMA改性土壤或粘土上的污染物应在很大程度上对细菌具有生物利用度，因为这些材料的解吸速率很高，并且某些降解细菌具有直接利用所吸附污染物的能力。

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