| 紫色土对邻苯二甲酸二甲酯的淋溶吸持特征及影响因素 |
| 摘要点击 1586 全文点击 871 投稿时间：2015-07-23 修订日期：2015-09-13 |
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| 中文关键词 紫色土 邻苯二甲酸二甲酯(DMP) 淋溶 吸持 影响因子 |
| 英文关键词 purple soil dimethyl phthalate (DMP) leaching adsorption influencing factors |
| 作者 | 单位 | E-mail | | 王强 | 西南大学资源环境学院, 三峡库区生态环境教育部重点实验室, 重庆 400716
重庆市农业资源与环境研究重点实验室, 重庆 400716 | wqiang0496@aliyun.com | | 宋娇艳 | 西南大学资源环境学院, 三峡库区生态环境教育部重点实验室, 重庆 400716
西南计算机有限责任公司, 重庆 400060 | | | 曾微 | 西南大学资源环境学院, 三峡库区生态环境教育部重点实验室, 重庆 400716
重庆市农业资源与环境研究重点实验室, 重庆 400716 | | | 王法 | 西南大学资源环境学院, 三峡库区生态环境教育部重点实验室, 重庆 400716
重庆市农业资源与环境研究重点实验室, 重庆 400716 | |
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| 中文摘要 |
| 以三峡库区典型土壤——紫色土为供试土壤,采用土柱淋溶试验方法,研究了紫色土对受邻苯二甲酸二甲酯(DMP)污染水体中DMP的吸持作用机制与影响因素.结果表明,抛物线方程是描述紫色土对受污染水体中DMP的吸持动力学的最佳方程; 淋溶液DMP浓度对紫色土吸持DMP的影响显著,紫色土对DMP吸持量随着淋溶液DMP浓度增加呈线性增长; 淋溶液离子强度和淋溶液pH对紫色土吸持DMP的影响显著,总体上离子强度的增加对DMP的吸持起到抑制作用,pH 5.0~7.0条件下的吸持量高于其他pH下的吸持量.在紫色土中添加有机质增加了紫色土对DMP的吸持; 但当外源有机质含量过高,超过30g ·kg-1时,吸持量反而低于其他添加量的吸持量.在紫色土中添加表面活性剂SDBS增加了紫色土对DMP的吸持,当SDBS添加量为50 mg ·kg-1时,紫色土对DMP的吸持量最大,而随着添加量的增加,对DMP的吸持量虽然仍高于对照组,但吸持量逐渐降低,当SDBS添加量为800 mg ·kg-1,紫色土对DMP的吸持量与对照接近. 持续淋溶时间影响土柱中DMP的垂直分布,当淋溶时间较短,上层土壤吸持DMP较多,随着淋溶时间的延长,土柱上下层DMP含量逐渐接近. |
| 英文摘要 |
| The typical soil-purple soil in Three Gorges Reservoir was the tested soil, the characteristics of adsorption leaching of dimethyl phthalate (DMP) in contaminated water by the soil, and the influencing factors in the process were conducted using soil column leaching experiment. The results showed that the parabolic equation was the best equation describing adsorption kinetics of DMP by soils. The concentration of DMP in the leaching solution had significant effect on the adsorption amounts of DMP. With the increasing concentration of DMP in the leaching solution, the adsorption capacities of DMP by purple soil increased linearly. The ionic strength and pH in leaching solution had significant effects on adsorption of DMP. On the whole, increasing of the ionic strength restrained the adsorption. The adsorption amounts at pH 5.0-7.0 were more than those under other pH condition. The addition of exogenous organic matter (OM) in purple soil increased the adsorption amount of DMP by purple soil. However, the adsorption amount was less than those with other addition amounts of exogenous OM when the addition of exogenous OM was too high (≥30 g ·kg-1).The addition of surfactant sodium dodecylbenzene sulfonic acid (SDBS) in purple soil increased the adsorption amount of DMP by purple soil. The adsorption amount was maximal when the addition amount of SDBS was 50 mg ·kg-1. However, the adsorption amounts decreased with increasing addition amounts of SDBS although the adsorption amounts were still more than that of the control group, and the adsorption amount was almost equal to that of the control group when the addition amount of SDBS was 800 mg ·kg-1. Continuous leaching time affected the vertical distribution of DMP in the soil column. When the leaching time was shorter, the upper soil column adsorbed more DMP, while the DMP concentrations in upper and lower soil columns became similar with the extension of leaching time. |
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