| .无机汞和甲基汞在土壤中的吸附-解吸特性研究[J].农业环境科学学报,2013,32(6):. |
| 无机汞和甲基汞在土壤中的吸附-解吸特性研究 |
| Adsorption-Desorption Characteristics of Inorganic Mercury and Methyl Mercury in Soils |
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| DOI：10.11654/jaes.2013.06.011 |
| 中文关键词: 无机汞 甲基汞 吸附 解吸 土壤 |
| 英文关键词: inorganic mercury methyl mercury adsorption desorption soil |
| 基金项目: |
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| 摘要点击次数: 1774 |
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| 中文摘要: |
| 采用振荡平衡法，研究了无机汞和甲基汞在4种土壤中的吸附-解吸规律及其pH对汞吸附的影响。结果表明：无机汞和甲基汞在土壤中的吸附-解吸均符合Freundlich方程；无机汞在水稻土、红壤、黄褐土、砂姜黑土中吸附的Kf值分别为122.25、86.60、70.95、76.60，甲基汞为55.99、45.00、41.94、40.43。土壤对两种汞均有较强的吸附能力，且土壤对无机汞的吸附能力强于甲基汞。有机质含量越高的土壤，对汞的吸附能力越强；改变土壤初始pH对无机汞的吸附具有一定的影响，过酸或过碱环境不利于土壤对无机汞的吸附，但土壤初始pH变化对甲基汞的吸附影响不大。无机汞和甲基汞在土壤中的解吸过程都存在明显的滞后效应，且吸附能力越强的土壤，解吸能力越弱，滞后性越显著。 |
| 英文摘要: |
| Adsorption-desorption of inorganic mercury（HgCl2） and Methyl mercury（MeHg） in four different soils and the effects of pH on the adsorption were studied using batch equilibration techniques. The results showed that the adsorption-desorption isotherms of HgCl2 and MeHg in soils were fitted by the Freundlich empirical equation（r>0.98）. The adsorption coefficients Kf of HgCl2 in paddy soil, red soil, yellow brown soil, shajiang black soil were 122.25, 86.60, 70.95, 76.60, respectively; The Kf values of MeHg were 55.99, 45.00, 41.94, 40.43, respectively. The soils had the great adsorption capacity for HgCl2 and MeHg, and soil adsorption for HgCl2 was stronger than that for MeHg. The adsorption of HgCl2 and MeHg in soils increased with increase in the organic matter contents of the soil. The changes of soil initial pH could influence the adsorption of HgCl2, and the largest amount of adsorption took place under neutral conditions, but it had little effect on the adsorption of MeHg. The desorption of HgCl2 and MeHg from soils showed significant hysteresis effects which was indicated by the higher adsorption slope（1/nads） compared to the desorption slope（1/nads）. Soils that adsorbed more mercury also desorbed less mercury. |
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