Facilitation of humification of recalcitrant chlorinated organic compounds via the catalytic oxidation and toxicity of humification products

从14种土壤中提取腐殖质物质，研究了铁(III)-卟啉络合物和KHSO_5催化氧化体系中腐殖质化参数（元素组成和酸性官能团含量）与五氯酚（PCP）降解率的相关性。研究发现，腐殖化程度较低的HSs的存在大大降低了PCP降解的百分比。2003年,37岁,1031)。另一方面，PCP被氧化为反应中间体，如苯氧自由基，通过自由基偶联形成腐殖化产物。对反应产物的生物测定（Microtox试验）表明，通过形成腐殖化产物，PCP的毒性大大降低。2003年,37386年)。将铁(III)-卟啉配合物与KHSO_5的催化体系应用于PCP污染土壤时，添加泥炭HS可提高土壤对PCP的去除效果。这表明添加腐殖质化程度较低的HS对pcp污染土壤的解毒是有用的（toxicol . environmental . chem）。2003年,85年,39)。此外，其他仿生催化剂以及铁(III)-卟啉络合物，如铁(III)-酞菁和锰(III)-卟啉络合物，也有助于在煤泥hs存在下增强PCP的降解。从环糊精模型实验推测，腐殖质化程度较低的HS的这种效应可能是由于仿生催化剂与HS中的糖部分（j.l l. catalal）相互作用所致。A, in press)。

Humic substances (HSs) were extracted from 14-types of soils, and the correlations between the parameters of humification (e.g. elemental composition and contents of acidic functional groups) and the percentages of pentachlorophenol (PCP) degradation were investigated in the catalytic oxidation system with iron(III)-porphyrin complex and KHSO_5. It found that the percentages of PCP degradation were largely reduced by the presence of HSs, which were of lower degree of humification (Environ.Sci.Technol. 2003,37,1031). On the other hand, PCP was oxidized to reaction intermediates, such as phenoxy radicals, and this resulted in the formation of humification products via the radical coupling. A bioassay (Microtox test) of the reaction products demonstrated that the toxicity of PCP was largely reduced by forming the humification products (Environ.Sci.Technol. 2003,37,386). When the catalytic system with iron(III)-porphyrin complex and KHSO_5 was applied to the PCP-contaminated soil, the PCP removal from the soil was enhanced by adding peat HS. This implies that the addition of HS with lower degree of humification is useful for the detoxification of PCP-contaminated soils (Toxicol.Environ.Chem. 2003,85,39). In addition, other biomimetic catalysts as well as iron(III)-porphyrin complex, such as iron(III)-phthalocyanine and manganese(III)-porphyrin complexes, were also useful for enhancing PCP degradation in the presence of peat HSs. I supposed from the model experiments using cyclodextrin that such effects of HS with lower degree of humification may be attributed to the interactions between biomimetic catalysts and the sugar moieties in HSs (J.Mol.Catal. A, in press).