| 牛丹妮,弓晓峰,李远航,孙玉恒,舒瑶,曾慧卿.AQDS和腐植酸对微生物介导铁还原过程的影响[J].农业环境科学学报,2021,40(12):2733-2741. |
| AQDS和腐植酸对微生物介导铁还原过程的影响 |
| Effects of AQDS and humic acids on the iron reduction process mediated by microorganisms |
| 投稿时间：2021-04-27 |
| DOI：10.11654/jaes.2021-0502 |
| 中文关键词: 腐败希瓦氏菌 异化铁还原 腐植酸 蒽醌-2,6-二磺酸盐(AQDS) |
| 英文关键词: Shewanella putrefaciens dissimilated iron reduction humic acid anthraquione-2, 6-disulfonate (AQDS) |
| 基金项目:国家自然科学基金项目（41761095） |
| 作者 | 单位 | E-mail | | 牛丹妮 | 南昌大学资源环境与化工学院, 鄱阳湖环境与资源利用教育部重点实验室, 南昌 330031 | | | 弓晓峰 | 南昌大学资源环境与化工学院, 鄱阳湖环境与资源利用教育部重点实验室, 南昌 330031 | xfgong@ncu.edu.cn | | 李远航 | 南昌大学资源环境与化工学院, 鄱阳湖环境与资源利用教育部重点实验室, 南昌 330031 | | | 孙玉恒 | 南昌大学资源环境与化工学院, 鄱阳湖环境与资源利用教育部重点实验室, 南昌 330031 | | | 舒瑶 | 南昌大学资源环境与化工学院, 鄱阳湖环境与资源利用教育部重点实验室, 南昌 330031 | | | 曾慧卿 | 南昌大学资源环境与化工学院, 鄱阳湖环境与资源利用教育部重点实验室, 南昌 330031 | |
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| 中文摘要: |
| 为探讨异化铁还原过程中电子传递物质的影响，研究了在腐败希瓦氏菌（希瓦氏菌属）介导下，腐植酸、腐殖质同类物蒽醌-2，6-二磺酸盐（anthraquione-2，6-disulfonate，AQDS）在厌氧条件下对异化铁还原过程的影响，并进行Logistics方程拟合；同时对不同来源腐植酸进行了元素分析、紫外-可见光吸收光谱分析和傅里叶红外吸收光谱分析。结果表明：添加低质量浓度（10~100 mg·L-1）土壤腐植酸对异化铁还原过程的促进效果不明显，而高质量浓度（200~500 mg·L-1）促进效果显著；与对照组（添加2 mL无菌水处理）相比，添加了泥炭湿地腐植酸的体系中Fe（Ⅱ）最终产生量增加，但各质量浓度处理间Fe （Ⅱ）产生量差别较小； AQDS促进Fe （Ⅲ）还原，其添加浓度越高，还原效果越好。Logistics方程显示，腐植酸和AQDS均能加快Fe （Ⅲ）还原速率，有效提高Fe （Ⅲ）还原率。两种不同来源腐植酸的分析结果显示，两者均有大量含氧活性官能团和芳香族、脂肪族物质，但与泥炭湿地腐植酸相比，土壤腐植酸腐殖化和芳香化程度更强。研究表明，腐植酸和AQDS作为电子传递物质，对促进微生物介导的铁还原过程有重要作用，且芳香化程度越强，促进效果越显著。 |
| 英文摘要: |
| To explore the effects of electron transport on alienated iron reduction, the effects of humic acids and the humus kinoid anthraquione-2,6-disulfonate(AQDS) on the reduction of dissimilated iron under the anaerobic condition was studied under the mediation of Shewanella putrefaciens(Shewanella), and fitting of the logistic equation was performed. Moreover, elemental analysis, UV-visible spectroscopy, and Fourier transform infrared spectroscopy of humic acids from different sources were carried out. The results showed that soil humic acid added with low mass concentration(10~100 mg·L-1) made little difference in the promotion effect of the alienation iron reduction process, but a high mass concentration(200~500 mg·L-1) of soil humic acid promoted the effect significantly. Compared to the control group, the final amount of Fe(Ⅱ) was increased in the system with peat wetland humic acid added, but the final amount showed little difference along the different mass concentration gradient. AQDS promoted Fe(Ⅲ) reduction, and the reduction effect became stronger with higher concentration. According to the logistic equation, both humic acid and AQDS could accelerate the Fe(Ⅲ) reduction rate and also improve the Fe(Ⅲ) percent reduction effectively. The analysis results of the different sources of humic acids showed that both humic acids had a large number of oxygen reactive functional groups, aromatic substances, and aliphatic substances. However, the degrees of humification and aromatization of soil humic acid were stronger than those of humic acid from peat wetland. In conclusion, humic acids and AQDS, as electron transport substances, play an important role in promoting the iron reduction process mediated by the microorganisms, and the promotion effect is more significant when the degree of aromatization is stronger. |
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