pCO2平面光极在生物扰动存在下水/沉积物体系中的应用  

Application of a p_(CO_2) Planar Optode in Water/Sediment System with the Presence of Bioturbation

作　　者：李一楠[1] 毛丹[1] 政芳 花修艺[1] 郭志勇[1] 董德明[1] 

机构地区：[1]吉林大学环境与资源学院,地下水资源与环境教育部重点实验室,水资源与水环境吉林省重点实验室,长春130012

出　　处：《吉林大学学报（理学版）》2015年第4期809-816,共8页Journal of Jilin University:Science Edition

基　　金：国家自然科学基金(批准号:20607007);中央高校基本科研业务费专项基金(批准号:201103113);国家水体污染控制与治理科技重大专项基金(批准号:2012ZX07202-009)

摘　　要：用内层包埋、外层覆盖的方法制备一种基于TOA+PTS4-离子对的pCO2平面荧光传感膜,并将该传感膜制备的pCO2平面光极系统应用于生物扰动存在的水/沉积物体系,通过连续监测体系垂直剖面pCO2的分布及变化,可得水/沉积物体系中pCO2的原位二维时空分布图.结果表明:在生物扰动作用下,体系中底层上覆水pCO2的变化较大,先上升后逐渐稳定;沉积物表层的pCO2边界扩散层逐渐消失,中层沉积物中pCO2基本不变,深层沉积物中pCO2先增大后逐渐稳定.体系中pCO2的变化是一个复杂的多维变化,涉及CO2产生和消耗的动态过程,是物理混合、颤蚓生命活动及有机质矿化等多种机制综合作用的结果.A pCO2 plane sensing membrane based on TOA＋PTS4-was developed by physical entrapping fluorescent indicator in the inner side and coverring with a permeable silicone layer in the out side.With the aid of camera,the sensor can directly show the variability in the distribution of pCO2 vertical profile in water/sediment system.The planar fluorosensor was applied to a simulated water/sediment microcosm with the presence of bioturbation.The monitoring results indicate that in the presence of bioturbation,the pCO2 in the interface of overlying water changed significantly.It goes upward and then becomes stable gradually.Meanwhile,the diffusive boundary layer of surface sediment disappears gradually,the pCO2 of sediment in middle layer hardly changes,and pCO2 of sediment at depth increases to a stable level gradually.The changes of pCO2 in this system is a complex,multidimensional change,and also a dynamic process which is producing and consumingCO2.It is the result of the synthetic actions including physical mixing,life activity of tubificid,organic matter mineralization and other mechanism.

关 键 词：生物地球化学 生物扰动 沉积物 pCO2二维分布 pCO2平面荧光传感膜 

分 类 号：X131[环境科学与工程—环境科学]