吉林大学学报(理学版)

• 环境科学 • 上一篇    下一篇

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

周楠楠1, 李一楠1, 郭志勇1, 李义2, 花修艺1, 李耀睿1, 董德明1   

  1. 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
  • 收稿日期:2013-05-13 出版日期:2014-03-26 发布日期:2014-03-20
  • 通讯作者: 花修艺 E-mail:huaxy@jlu.edu.cn

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

ZHOU Nannan1, LI Yinan1, GUO Zhiyong1, LI Yi2,HUA Xiuyi1, LI Yaorui1, DONG Deming1   

  1. 1. Key Lab of Groundwater Resources and Environment of Ministry of Education,Key Lab of Water Resources and Aquatic Environment of Jilin Province,College of Environment and Resources, Jilin University, Changchun 130012, China;2. Hebei Institute of Environmental Geological Exploration, Shijiazhuang 050021, China
  • Received:2013-05-13 Online:2014-03-26 Published:2014-03-20
  • Contact: HUA Xiuyi E-mail:huaxy@jlu.edu.cn

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.

关键词: 生物扰动, 平面光极, DO传感器, 沉积物, 生物地球化学

Abstract:

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 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.

Key words: bioturbation, planar optode, DO sensor, sediment, biogeochemistry

中图分类号: 

  • X131