有机酸对芘在土壤中的吸附影响研究

彭章; 龚香宜; 熊武芳; 胡宏元; 任大军

文章摘要

彭章,龚香宜,熊武芳,胡宏元,任大军.有机酸对芘在土壤中的吸附影响研究[J].农业环境科学学报,2020,39(7):1540-1547.

有机酸对芘在土壤中的吸附影响研究

Effects of organic acids on the adsorption of pyrene in soil

投稿时间：2020-02-27

DOI：10.11654/jaes.2020-0217

中文关键词: 有机酸土壤吸附芘

英文关键词: organic acid soil adsorption pyrene

基金项目:国家自然科学基金项目（41102218，41571306）；矿区环境污染控制与修复湖北省重点实验室开放基金项目（2018104）

作者	单位	E-mail
彭章	武汉科技大学资源与环境工程学院, 武汉 430081 冶金矿产资源高效利用与造块湖北省重点实验, 武汉 430081
龚香宜	武汉科技大学资源与环境工程学院, 武汉 430081 湖北理工学院矿区环境污染控制与修复湖北省重点实验室, 湖北黄石 435003	gong_xy@126.com
熊武芳	武汉科技大学资源与环境工程学院, 武汉 430081
胡宏元	武汉科技大学资源与环境工程学院, 武汉 430081
任大军	武汉科技大学资源与环境工程学院, 武汉 430081

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中文摘要:

有机酸影响有机污染物在土壤中的吸附。通过等温吸附试验，研究了富里酸和柠檬酸对不同有机质含量和组分的土壤吸附芘的影响。试验结果表明，加柠檬酸后，原土土样、去除软碳的H₂O₂处理土样和不含有机质的灼烧土样的吸附K_d值分别下降了16.42%、31.29%、30.47%；加富里酸后，原土土样、H₂O₂处理土样、灼烧土样的吸附K_d值分别下降了79.09%、47.77%、46.00%；不加酸时，H₂O₂处理土样和灼烧土样的吸附K_d值相比原土土样分别下降了73.35%和88.21%。柠檬酸和富里酸对土壤吸附芘的影响不同，柠檬酸在低浓度时促进土壤对芘的吸附，在高浓度时抑制土壤对芘的吸附；富里酸在不同浓度都抑制土壤对芘的吸附，且随着浓度升高，抑制作用越强。另外，有机质含量高或含软碳组分的土壤，富里酸抑制作用强，有机质含量低或只含硬碳或矿物质的土壤，柠檬酸抑制作用强。

英文摘要:

Organic acids affect the adsorption of organic pollutants in soil. To study the effects of fulvic acid and citric acid on the adsorption of pyrene in soils with different organic matter contents and components, isothermal adsorption experiments were carried out. The results showed that the adsorption K_d values of the original soil, a H₂O₂ treated soil(i.e., with soft carbon removed), and a burnt soil without organic matter decreased by 16.42%, 31.29%, and 30.47%, respectively, after adding citric acid, and by 79.09%, 47.77%, and 46.00%, respectively, after adding fulvic acid. When no acid was added, the adsorption K_d values of the H₂O₂ treated soil and burnt soil decreased by 73.35% and 88.21%, respectively, in comparison to the original soil. Citric acid and fulvic acid had dissimilar effects on the adsorption of pyrene in soil. Citric acid promoted the adsorption of pyrene in soil at low concentrations, but inhibited absorption at high concentrations. In contrast, fulvic acid at different concentrations inhibited pyrene adsorption, whereby an increased fulvic acid concentration enhanced the inhibition effect. In addition, the inhibition effect of fulvic acid was stronger for soils with a relatively high organic matter content and soils containing soft carbon components, whereas the inhibition effect of citric acid was stronger for soils with a relatively low organic matter content and soils containing only hard carbon or minerals.

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