| 纳米TiO2对底泥中汞释放及活化的影响 |
| 摘要点击 2486 全文点击 1309 投稿时间：2014-05-20 修订日期：2014-07-01 |
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| 中文关键词 纳米TiO2 汞 底泥 释放 甲基化 |
| 英文关键词 nano-TiO2 mercury sediment release methylation |
| 作者 | 单位 | E-mail | | 张金洋 | 西南大学资源环境学院, 重庆 400716
内江师范学院化学化工学院, 内江 641112 | goldensea73@163.com | | 李楚娴 | 西南大学资源环境学院, 重庆 400716 | | | 王定勇 | 西南大学资源环境学院, 重庆 400716
重庆市农业资源与环境研究重点实验室, 重庆 400716 | dywang@swu.edu.cn | | 周雄 | 西南大学资源环境学院, 重庆 400716 | | | 孙荣国 | 西南大学资源环境学院, 重庆 400716 | | | 张成 | 西南大学资源环境学院, 重庆 400716
重庆市农业资源与环境研究重点实验室, 重庆 400716 | | | 梁丽 | 西南大学资源环境学院, 重庆 400716 | |
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| 中文摘要 |
| 为了研究纳米TiO2对底泥汞的释放及活化的影响，采用模拟淹水实验，分析纳米TiO2对底泥和上覆水中总汞和甲基汞浓度的影响，并结合底泥中各形态汞的变化情况探讨纳米TiO2对汞的迁移转化的影响. 结果表明，纳米TiO2可促进底泥中汞的释放，导致更多的汞释放到水中，与对照相比，4 g·kg-1纳米TiO2导致上覆水中总汞浓度最高时上升91.32%，最终土壤汞的释放量增加约10%，主要原因是纳米TiO2可促进氧化态汞的溶解，这可能会提高水体汞污染的风险. 此外，在本实验条件下，短期内纳米TiO2可能降低了底泥甲基汞的形成和释放，但长期淹水后没有明显的影响. 总体来看，纳米TiO2对底泥汞释放和转化的影响随浓度升高而增大. 因此，随着底泥或土壤中纳米TiO2含量的升高，其对汞的地球化学循环过程的影响可能加剧. |
| 英文摘要 |
| To investigate the effects of nano-TiO2 on mercury release and activation in sediment, flooding simulation experiments were conducted. The impacts of nano-TiO2 on total mercury and methylmercury concentrations in overlying water were analyzed. And the influences of nano-TiO2 on the migration and transformation of mercury were discussed based on changes of mercury speciation in sediment. The results indicated that nano-TiO2 promoted the release of mercury in sediment, leading to more mercury released into the water. Compared with the control, 4 g·kg-1 TiO2 nanoparticles increased the total mercury by 91.32%, when the concentration of total mercury in overlying water was the highest. Release of mercury in soil was increased by approximately 10% finally. The main reason may be that the dissolution of oxidation state mercury was improved by nano-TiO2. It indicated that the risk of mercury contamination in water may increase. Moreover, under the experimental conditions, nano-TiO2 may reduce the formation of methylmercury in sediment in the short term, but no significant effects in the long term. Generally, the effects of nano-TiO2 on the release and transformation of mercury in sediment showed concentration dependence. Thus, with increasing nano-TiO2 content in sediment or soil, its impact on the geochemical cycle of mercury may increase. |
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