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首页> 外文期刊>Environmental toxicology and chemistry >EFFECTS OF SELECTED REDUCING AGENTS ON MICROBIOLOGICALLY MEDIATED REDUCTIVE DECHLORINATION OF AROCLOR~® 1242
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EFFECTS OF SELECTED REDUCING AGENTS ON MICROBIOLOGICALLY MEDIATED REDUCTIVE DECHLORINATION OF AROCLOR~® 1242

机译：选定的还原剂对微生物介导的AROCLOR〜®1242的还原脱氯的影响

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摘要

The effect of various chemical reducing agents on the anaerobic microbial reductive biotransformation of polychlorinated biphenyls (PCBs) was investigated using Aroclor~® 1242 at a concentration of 600 μg/g soil and microorganisms eluted from Hudson River sediments. The investigation sought to determine how various reducing agents influenced PCB dechlorination rates, patterns, and acclimation periods. Three reducing agents were incorporated into culture media: amorphous ferrous sulfide, sodium sulfide with sodium thioglycollate, and sodium sulfide with amorphous ferrous sulfide. AH cultures were incubated statically under methanogenic conditions and ambient incubation temperatures of about 20℃. Cultures utilizing both sodium sulfide and ferrous sulfide together demonstrated the most extensive removal of meta- and para-chlorines, the highest average dechlorination rate, the greatest dechlorination of tri- and tetrachlorinated biphenyls, and the greatest accumulation of dichlorobiphenyl homologues. Overall, treatments incorporating ferrous sulfide, alone or in combination with sodium sulfide, demonstrated the ability to more effectively dechlorinate tn-ortho-substituted tetrachlorobiphenyls and pentachlorobiphenyls which had commonly positioned chlorines. Under these same conditions, dichlorobiphenyls, which are more amenable to aerobic dechlorination conditions, increased from 25% (molar basis) initially to levels greater than 60%.
机译：使用1242浓度为600μg/ g的土壤和从哈得逊河沉积物中洗脱的微生物，研究了各种化学还原剂对多氯联苯（PCBs）厌氧微生物还原性生物转化的影响。该调查试图确定各种还原剂如何影响PCB的脱氯速度，方式和适应时间。将三种还原剂掺入培养基中：无定形硫化亚铁，硫化钠和巯基乙酸钠，以及硫化钠和无定形硫化亚铁。将AH培养物在产甲烷条件下和环境培养温度约20℃下静态培养。一起使用硫化钠和硫化亚铁的培养物显示了最广泛的对间氯和对氯的去除，最高的平均脱氯率，最大的三氯和四氯联苯的脱氯以及最大的二氯联苯同系物的积累。总体而言，单独或与硫化钠结合使用硫化亚铁的处理方法，能够更有效地脱除通常位于氯气中的叔丁基取代的四氯联苯和五氯联苯。在这些相同条件下，更适合于有氧脱氯条件的二氯联苯从最初的25％（摩尔基准）增加到大于60％的水平。

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