基于平面光极的DO二维实时监测系统在生物扰动存在下水/沉积物体系中的应用  

Application of a Real-Time Two-Dimensional DO Monitoring System Based on Planar Optode in a Water/Sediment System under Bioturbation

作　　者：周楠楠[1] 李一楠[1] 郭志勇[1] 李义 花修艺[1] 李耀睿[1] 董德明[1] 

机构地区：[1]吉林大学 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、环境与资源学院,长春 130012 [2] 河北省环境地质勘查院,石家庄050021

出　　处：《吉林大学学报（理学版）》2014年第2期376-382,共7页Journal of Jilin University:Science Edition

基　　金：国家自然科学基金(批准号:20607007);国家“水体污染控制与治理”科技重大专项基金(批准号:2012ZX07202009);中央高校基本科研业务费专项基金(批准号:201103113)

摘　　要：采用改进的平面传感膜制备方法,建立应用于淡水/沉积物模拟体系的溶解氧（DO）二维分布监测系统。结果表明：采用物理包埋法将荧光指示剂三（4,7-联苯-1,10-邻菲啰啉）二氯化钌固定于乙基纤维素膜上,制备的DO 平面传感膜荧光强度随DO 质量浓度的增加而减小,符合荧光淬灭的 Stern-Volmer 方程,具有 DO 响应范围宽（0~20 mg/L）、响应速度快（〈60 s）、准确性高、可逆性和稳定性好等优点；在生物扰动存在下,沉积物 DO 变化较小,对上覆水DO 影响较大,这是由于物理混合和氧化还原等多种机制综合作用所致,生物扰动将直接或间接影响这些作用。A new plane sensing membrane was developed in the study,and then a system was established to monitor the spatial and temporal distribution of dissolved oxygen （DO）in a simulated freshwater/sediment microcosm.Sensing foils were fabricated by physical entrapping fluorescent indicator tris（4,7-diphenyl-1,10-phenanthroline）ruthenium dichloride in ethyl cellulose film,and the emission fluorescence intensity was decreased with the increase of the concentration of dissolved oxygen,which conforms to the Stern-Volmer equation of the fluorescence quenching mechanism.The sensor is precise,stable,with fast response time （〈60 s）and good reversibility,and has a wide＆amp;nbsp;DO-sensitive range （0-20 mg/L）.According to the monitoring results by the system,although the temporal and spatial variation in the sediment was minor under bioturbation,the sediment has significant effects on the DO of overlying water.Complex changes of DO in the system were the result of combined effects of a variety of mechanisms such as physical mixing and redox.And these effects were all affected by bioturbation.

关 键 词：生物扰动 平面光极 DO 传感器 沉积物 生物地球化学 

分 类 号：X131[环境科学与工程—环境科学]