| 河水与海水混合过程中Eh-pH的变化特征及影响因素 |
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| 引用本文： | 廖辉杰,范德江,逄悦,孙学诗.河水与海水混合过程中Eh-pH的变化特征及影响因素[J].中国海洋大学学报(自然科学版),2021(4). |
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| 作者姓名： | 廖辉杰 范德江 逄悦 孙学诗 |
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| 作者单位： | 中国海洋大学海洋地球科学学院;中国海洋大学海底科学与探测技术教育部重点实验室 |
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| 基金项目： | 国家自然科学基金项目(41676036)资助。 |
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| 摘 要： | 河口是河水和海水混合地带,河口地区每时每刻都在发生复杂的物理、化学、生物作用,该过程中水体Eh、pH参数的变化直接关系到氧化还原元素的行为以及重金属、有机污染物的迁移、转化和清除。本研究采集了长江河水、东海陆架海水,设置了盐度为5、12.5、25的3组混合实验,模拟长江河口水体混合过程,实时测定混合过程中水体Eh、pH变化,分析其影响因素。结果表明:混合水体为弱碱性-强氧化环境,pH值变化范围为7.83~8.22,pH值总体上呈现下降的趋势;Eh值变化范围为503.7~579.7 mV,在混合开始的1 h内迅速升高,随后迅速下降并逐渐趋于稳定。河水和海水混合过程中Eh、pH的变化主要受机械混合和氧化还原反应控制,机械混合导致两类水体Eh、pH快速中和,以Fe2+为主的氧化反应消耗了水体中的O2和OH-,使得混合水体中的Eh、pH呈现下降趋势,并逐渐趋于稳定。
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| 关 键 词： | 长江河口 水体混合 模拟实验 氧化还原电位(Eh) PH |
The Changes of Eh and pH in the River Water and Sea Water Mixing Process and Their Influencing Factors |
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| LIAO Hui-Jie,FAN De-Jiang,PANG Yue,SUN Xue-Shi.The Changes of Eh and pH in the River Water and Sea Water Mixing Process and Their Influencing Factors[J].Periodical of Ocean University of China,2021(4). |
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| Authors: | LIAO Hui-Jie FAN De-Jiang PANG Yue SUN Xue-Shi |
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| Institution: | (College of Marine Geosciences, Ocean University of China, Qingdao 266100,China;The Key Laboratory of Submarine Geosciences and Technology, Ministry of Education, Ocean University of China, Qingdao 266100,China) |
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| Abstract: | The estuary is a mixed zone of river water and sea water,and also an important geochemical interface,where complex physical,chemical and biological processes take place.In this process,the changes of Eh and pH of water body are directly related to the behavior of redox elements and the migration,transformation and clarity of heavy metals and organic pollutants.In this study,three groups of mixing experiments with salinity of 5,12.5 and 25 were set up to simulate the mixing process of the Yangtze River Estuary.The changes of Eh and pH in the water during the mixing process were measured in time serial and the influencing factors were analyzed.The results show that the mixed water is in weak alkaline and strong oxidation environment,the pH value changes in the range of 7.83~8.22,and the pH value generally shows a downward trend.The EH value changes in the range of 503.7~579.7 mV,which increases rapidly within 1 hour after mixing,then decreases rapidly and tends to be stable gradually.The changes of EH and pH in the mixing process of river water and sea water are mainly controlled by mechanical mixing and oxidation-reduction reaction.Mechanical mixing results in the rapid neutralization of EH and pH in the two kinds of water bodies.The oxidation reaction dominated by Fe2+consumes O2 and OH-in the water bodies,making EH and pH in the mixed water bodies present a downward trend and tend to be stable gradually. |
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| Keywords: | Yangtze River Estuary water mixing simulated experiment Eh pH |
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