pH及DO对磷酸盐在长江口混合过程中迁移、转化的影响  

Effects of pH and DO on the migration and transformation of phosphate in the process of mixing in the Changjiang Estuary

作　　者：李鸿妹[1,2] 石晓勇[1,2,3] 陈鹏 张传松[1,2] 

机构地区：[1]中国海洋大学化学化工学院,山东青岛266100 [2]中国海洋大学海洋化学理论与工程技术教育部重点实验室,山东青岛266100 [3]国家海洋局减灾中心,北京100194 [4]中国烟台赫尔曼.格迈纳尔中学,山东烟台264000

出　　处：《海洋环境科学》2014年第4期497-502,共6页Marine Environmental Science

基　　金：国家重点基础研究发展计划(973)项目(2010CB428701)

摘　　要：通过实验室模拟实验,研究了不同pH及富氧、缺氧条件下长江径流淡水和东海外海水在混合过程中磷酸盐（PO4-P）的稀释模式,并结合2006-2007年长江口及邻近海域PO4-P的实际稀释状况,分析了pH及DO对PO4-P在河口混合行为的影响。结果表明：咸淡水混合需要一定的平衡时间,过滤后的长江水与外海水混合后,大约15 h后PO4-P浓度不再变化;未过滤的长江水与外海水混合则需要10 h的平衡时间。在不同pH咸淡水的混合过程中,PO4-P浓度与盐度均呈现出较好的相关性。且在高、低盐度区,PO4-P浓度与pH的变化分别呈现出不同的趋势。在缺氧和富氧状态下,PO4-P浓度均随盐度的增大而降低,且缺氧状态的PO4-P浓度高于富氧状态的PO4-P浓度。此外,根据2006-2007年长江口及邻近海域的现场调查数据可知,PO4-P在河口的实际稀释状况与本研究的实验结果基本相一致。Based on simulation experiment in lab, the diluted model of phosphate （PO,-P） under different conditions of pH, aerobic and anoxic in the mixing of seawater and fresh water in the Changjiang Estuary was studied. The data in situ in the Changjiang Estuary and its adjacent areas of 2006 and 2007 was also used to analyze the actual mixing process of PO4-P in the Estuary. The results showed that the mixing process need some time to reach balance. The concentration of PO4-P could keep constant after 15 h in the mixing process of filtered Changjiang water and seawater; while the mixing of unfiltered Changjiang water and seawater only needed 10 h for balance. A good positive relation- ship was observed between PO4-P and salinity in the mixing process of seawater and fresh water under different pH. And the variations of PO4-P and pH also presented different trends in higher or lower salinity areas respectively. In addition, the concentration of PO4-P decreased with the increase of salinity not only in aerobic condition, but also in anoxic condition. Furthermore, the PO4-P concentration was higher in anoxic condition than that in aerobic status. Besides, the results of simulation experiment was consist with the field observation in the Changjiang Estuary and itsadjacent areas.

关 键 词：磷酸盐 PH 溶解氧 长江口 稀释模式 迁移转化 

分 类 号：X145[环境科学与工程—环境科学]