State Key Laboratory of Environmental Criteria and Risk Assessment , Chinese Research Academy of Environmental Sciences , Beijing 100012 , China.
School of Environment and State Key Joint Laboratory of Environment Simulation and Pollution Control , Tsinghua University , Beijing 100084 , China.
J Agric Food Chem. 2019 May 1;67(17):4726-4733. doi: 10.1021/acs.jafc.8b05864. Epub 2019 Apr 17.
Compost-derived humic acids (HAs) as cheap soil conditioners have potential to facilitate pentachlorophenol (PCP) bio-dechlorination but lack proof and studies. To clarify this, PCP bio-dechlorination mediated by compost-derived HAs under Fe(III) reduction conditions was investigated. Reverse phase high-performance liquid chromatography and high-performance size exclusion chromatography were employed to identify the functional components within compost-derived HAs. Our results showed that compost-derived HAs facilitated the bio-dechlorination of PCP under Fe(III) reduction conditions, and four kinds of byproducts were detected during the process. The relatively hydrophilic and high molecular weight (MW) components within compost-derived HAs presented significant associations with the concentration of byproducts from bio-dechlorination of PCP in FeO reduction conditions. In contrast, the hydrophobic and low MW components were the main functional components for PCP bio-dechlorination in FeO reduction environment. These findings clarified the effects of polarity and MW of compost-derived HAs on PCP bio-dechlorination, giving clues to optimize composting technology to utilize compost products for in situ contamination remediation of paddy soil.
堆肥衍生腐植酸（HAs）作为廉价的土壤调理剂，具有促进五氯苯酚（PCP）生物脱氯的潜力，但缺乏证据和研究。为了澄清这一点，研究了在 Fe(III)还原条件下堆肥衍生腐植酸介导的 PCP 生物脱氯。采用反相高效液相色谱法和高效体积排阻色谱法鉴定堆肥衍生腐植酸中的功能成分。结果表明，堆肥衍生腐植酸在 Fe(III)还原条件下促进了 PCP 的生物脱氯，并且在该过程中检测到四种副产物。在 FeO 还原条件下，堆肥衍生腐植酸中相对亲水性和高分子量（MW）成分与 PCP 生物脱氯副产物的浓度呈显著相关。相比之下，疏水性和低 MW 成分是 FeO 还原环境中 PCP 生物脱氯的主要功能成分。这些发现阐明了堆肥衍生腐植酸的极性和 MW 对 PCP 生物脱氯的影响，为优化堆肥技术以利用堆肥产品原位修复稻田污染提供了线索。
