pH平面光极在生物扰动存在下水/沉积物体系中的应用  

Application of pH Planar Optode in Water/Sediment System with the Presence of Bioturbation

作　　者：沈万斌[1] 周楠楠 李一楠[1] 郭志勇[1] 李耀睿[1] 花修艺[1] 董德明[1] 

机构地区：[1]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/吉林大学环境与资源学院,长春130012

出　　处：《吉林大学学报（地球科学版）》2013年第3期931-938,共8页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目(20877033);中央高校基本科研业务费专项资金(201103113);国家"水体污染控制与治理"科技重大专项(2012ZX07202009)

摘　　要：为了解生物扰动存在下水/沉积物体系中pH的分布和变化特征,通过改进传感膜制备方法和图像采集与定量方法,建立了基于平面光极的pH二维分布实时监测系统,并应用于生物扰动存在下淡水/沉积物模拟体系pH时空分布规律的监测。结果表明:与已有方法相比,本方法具有响应pH范围宽(6.2～8.6)、响应快速(响应时间<30s)、准确性高、可逆性和抗干扰性强、稳定性好等优点,可用于监测有扰动生物存在的水/沉积物模拟体系微环境的pH,直观反映pH的时空变化规律。对模拟体系的监测结果表明:沉积物自身pH时空变化虽较小,但其对上覆水pH有重要影响,上覆水pH存在显著而复杂的变化。体系pH的变化规律是多种机制作用的结果,而生物扰动对这些作用均有影响。To determine the distribution and variation of pH in micro-environment of fresh water/sediment systems with the presence of bioturbation,a real-time two-dimensional pH monitoring system based on planar optode was developed,using a modified sensor foil preparation method and a modified isograms acquisition and quantification method.The system was applied to monitor the spatial and temporal distribution of pH in a simulated freshwater/sediment microcosm with the presence of bioturbation.Compared to similar existing monitoring method,there were many advantages as wide pH-sensitive range（6.2-8.6）,rapid response（30 s）,high precision,and good reversibility and stability,and it could be applied in the freshwater/sediment microcosm to show the spatial and temporal distribution of pH visually.According to the system monitoring,the spatial and temporal variation of pH in the sediment was minor,but the sediment has significant effects on the pH of overlying water.Significant and dynamic changes of pH distribution pattern in overlying water were observed,which was the combined effects of several actions,and these actions were all affected by the presence of bioturbation.

关 键 词：平面光极 PH传感器 生物扰动 沉积物 生物地球化学 

分 类 号：P59[天文地球—地球化学] X131[天文地球—地质学]