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首页> 美国卫生研究院文献>Environmental Engineering Science >Bioavailability of (Geno)toxic Contaminants in Polycyclic Aromatic Hydrocarbon–Contaminated Soil Before and After Biological Treatment
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Bioavailability of (Geno)toxic Contaminants in Polycyclic Aromatic Hydrocarbon–Contaminated Soil Before and After Biological Treatment

机译：生物处理前后多环芳烃污染土壤中（基）有毒污染物的生物利用度

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Contaminated soil from a former manufactured-gas plant site was treated in a laboratory-scale bioreactor. Desorbability and biodegradability of 14 polycyclic aromatic hydrocarbons (PAHs) and 4 oxygenated PAHs (oxy-PAHs) were investigated throughout a treatment cycle. Desorbability was determined using a mixed-function sorbent (Oasis® HLB) or a hydrophobic sorbent (Tenax®) in dialysis tubing suspended in the soil slurry. Toxicity and genotoxicity of the whole soil and the desorbable fractions were determined by DNA damage response analysis with the chicken DT40 B-lymphocyte isogenic cell line and its DNA repair-deficient mutant Rad54−/−. Biological treatment significantly removed both PAHs and oxy-PAHs, and their desorbability decreased throughout the bioreactor treatment cycle. Collectively, oxy-PAHs were more desorbable and biodegradable than the corresponding PAHs; for example, the oxy-PAH present at the highest concentration, 9,10-anthraquinone, was more desorbable and biodegradable than anthracene. For both PAHs and oxy-PAHs, the percentage removed in the bioreactor significantly exceeded the percentage desorbed from untreated soil, indicating that desorption did not control the extent of biodegradation. Consistent with previous results on the same soil, genotoxicity of the whole soil slightly increased after biological treatment. However, both toxicity and genotoxicity of the desorbable constituents in the soil decreased after treatment, suggesting that any genotoxic constituents that may have formed during treatment were primarily associated with less accessible domains in the soil.
机译：在实验室规模的生物反应器中处理了从以前的天然气生产厂场污染的土壤。在整个治疗周期中，研究了14种多环芳烃（PAH）和4种氧化PAH（oxy-PAHs）的解吸性和生物降解性。使用悬浮在土壤浆液中的透析管中的混合吸附剂（Oasis HLB）或疏水吸附剂（Tenax ®）确定解吸性。通过对鸡DT40 B淋巴细胞等基因细胞系及其DNA修复缺陷型突变体Rad54 -/-的DNA损伤反应分析，确定了整个土壤的毒性和遗传毒性以及可解吸级分。生物处理显着去除了PAHs和oxy-PAHs，并且在整个生物反应器处理周期中，它们的脱附能力均下降。总的来说，氧基-PAHs比相应的PAHs更易于解吸和生物降解。例如，最高浓度的氧-PAH（9,10-蒽醌）比蒽具有更高的可吸收性和生物降解性。对于多环芳烃和含氧多环芳烃，在生物反应器中去除的百分比都大大超过了从未处理土壤中解吸的百分比，这表明解吸并不能控制生物降解的程度。与先前在相同土壤上的结果一致，生物处理后整个土壤的遗传毒性略有增加。但是，土壤中可吸收成分的毒性和遗传毒性在处理后都降低了，这表明在处理过程中可能形成的任何遗传毒性成分主要与土壤中难以接近的区域有关。

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