College of Water Sciences, Beijing Normal University, Beijing, 100875, China; State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China; State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing, 100012, PR China.
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China; State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing, 100012, PR China.
Chemosphere. 2018 Oct;208:77-83. doi: 10.1016/j.chemosphere.2018.05.160. Epub 2018 May 29.
Whether polarity and molecular weight (MW) of compost-derived organic matters have significant impacts on their redox properties are far unknown. Our results showed that both the FeO and FeO reduction by S. oneidensis MR-1 were effectively facilitated by compost-derived humic acids (HAs) under anoxic condition. Among the 15 kinds of compost-derived components identified by the reverse phase high-performance liquid chromatography (RP-HPLC) and high-performance size exclusion chromatography (HPSEC), the relatively hydrophilic and high MW compost-derived components presented significant associations with FeO reduction, and the hydrophobic components correlated well with FeO reduction. Quinones content and aromaticity of the compost-derived HAs presented positive correlation with Fe(III) oxides reduction. These findings demonstrated the impacts of the polarity and MW of compost-derived HAs on Fe(III) oxides reduction, further suggested that compost-derived HAs could influence the geochemical behaviors of heavy metal, organic pollutants and nutrient elements in natural environment by facilitating the reduction of Fe(III) oxides, which were very useful for the improvement of composting technology and application of compost products.
堆肥衍生有机质的极性和分子量（MW）是否对其氧化还原性质有显著影响尚不清楚。我们的结果表明，在缺氧条件下，堆肥衍生腐殖酸（HA）可有效促进 S. oneidensis MR-1 对 FeO 和 FeO 的还原。在通过反相高效液相色谱（RP-HPLC）和高效尺寸排阻色谱（HPSEC）鉴定的 15 种堆肥衍生成分中，相对亲水和高 MW 的堆肥衍生成分与 FeO 还原呈显著相关性，而疏水性成分与 FeO 还原相关性良好。堆肥衍生 HA 的醌含量和芳香度与 Fe(III)氧化物还原呈正相关。这些发现表明堆肥衍生 HA 的极性和 MW 对 Fe(III)氧化物还原有影响，进一步表明堆肥衍生 HA 可通过促进 Fe(III)氧化物的还原，影响重金属、有机污染物和营养元素在自然环境中的地球化学行为，这对于改进堆肥技术和堆肥产品的应用非常有用。
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