| 李航,郑冬梅,马欢驰.辽河口湿地沉积物中汞含量变化特征的模拟研究[J].农业环境科学学报,2018,37(4):774-779. |
| 辽河口湿地沉积物中汞含量变化特征的模拟研究 |
| Simulation of total mercury content variability in wetland sediments in the Liaohe Estuary |
| 投稿时间：2017-10-01 |
| DOI：10.11654/jaes.2017-1517 |
| 中文关键词: 辽河口 汞 淹水盐度 温度 湿地 |
| 英文关键词: Liaohe estuary total mercury salinity of the flooding water temperature wetland |
| 基金项目:国家自然科学基金项目（41571085，31300444）；辽宁省高等学校创新人才支持计划（LR22016078） |
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| 摘要点击次数: 1846 |
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| 中文摘要: |
| 以辽河口裸滩表层（0~10 cm）和底层（10~20 cm）沉积物作为研究对象，采用室内恒温培养法进行模拟培养，探讨在淹水盐度（CK、0.50%、1.50%和1.80%）、环境温度（10、20℃和30℃）以及淹水状态（全淹水和半淹水）改变的情况下，辽河口裸滩表层和底层沉积物中总汞含量的变化趋势。结果表明：全淹水状态下，在淹水盐度为1.80%、培养温度为30℃时，表层和底层沉积物中汞含量均最低，分别为0.095 mg·kg-1和0.098 mg·kg-1；半淹水状态下，淹水盐度为1.80%，培养温度为30℃时，表层和底层沉积物中汞含量也最低，分别为0.103 mg·kg-1和0.101 mg·kg-1；两种淹水状态下，表层和底层沉积物中汞含量随盐度和温度的变化趋势基本一致。研究表明，随着淹水盐度升高，沉积物中总汞含量逐渐降低。相同盐度条件下，沉积物中总汞含量随环境温度（10~30℃）升高而逐渐降低。沉积物在淹水状态全淹水时比半淹水时更有利于无机汞的释放。 |
| 英文摘要: |
| Using a laboratory incubator to simulate the culturing process, we studied the change of total mercury content in response to changing salinity of flood water(CK, 0.5%, 1.5%, and 1.8%), environmental temperature(10℃, 20℃, and 30℃), and flooding conditions(full inundation or semi-inundation) for both the exposed surface and bottom layer(0~10 cm and 10~20 cm) of the mudflats sediments in the Liaohe estuary. The results showed that under the full inundation condition, the mercury content of the sediments in both layers reached the lowest level at a water salinity of 1.80% and culturing temperature of 30℃, reflecting a 0.095 mg·kg-1 and 0.098 mg·kg-1 concentration for the surface layer and the bottom layer, respectively. Under semi-inundation conditions, the mercury content of the sediments in both layers also reached its lowest level at the same salinity and temperature as the full inundation condition, resulting in concentrations of 0.103 mg·kg-1 and 0.101 mg·kg-1 for the surface layer and bottom layer, respectively. Under both inundation conditions, the overall trends of mercury content with salinity and temperature were generally the same. The concentration of total mercury in both layers gradually decreased with the rising salinity of the flooding water, while at a given salinity, the total mercury concentration decreased with the rising temperature from 10~30℃. The full inundation condition was more favorable than the semi-inundation condition in driving the release of inorganic mercury from sediments. |
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