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邓 欢,许 静,郭颖颖,蒋玉颖,魏琳钧,钟文辉.土壤产电信号与线性扫描伏安法联用模拟监测湿地铜污染[J].土壤,2018,50(5):942-948. DENG Huan,XU Jing,GUO Yingying,JIANG Yuying,WEI Linjun,ZHONG Wenhui.Combining Use of Soil Generated Electrical Signals and Linear Sweep Voltammetry to Stimulate Copper Pollution Monitoring in Wetland[J].Soils,2018,50(5):942-948 本文二维码信息
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土壤产电信号与线性扫描伏安法联用模拟监测湿地铜污染
Combining Use of Soil Generated Electrical Signals and Linear Sweep Voltammetry to Stimulate Copper Pollution Monitoring in Wetland
投稿时间:2017-06-24  修订日期:2017-07-25
DOI:10.13758/j.cnki.tr.2018.05.013
中文关键词:  土壤  污染监测  三电极体系  氧化峰  电压
Key Words:Soil  Pollution monitoring  Three-electrode mode  Oxidative peak  Voltage
基金项目:国家自然科学基金项目(41671250)和江苏省高校自然科学研究面上项目(16KJB210007)资助。
作者单位E-mail
邓 欢 南京师范大学环境学院 hdeng@njnu.edu.cn 
许 静 南京师范大学环境学院  
郭颖颖 南京师范大学环境学院  
蒋玉颖 南京师范大学环境学院  
魏琳钧 南京师范大学环境学院  
钟文辉 江苏省物质循环与污染控制重点实验室 zhongwenhui@njnu.edu.cn 
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中文摘要:
      本研究采用产电信号与线性扫描伏安法(LSV)联用,探索快速响应和鉴定湿地铜污染的方法。采集湖岸土壤并淹水用以模拟湿地环境,构建土壤产电体系并实时连续记录土壤产电电压。土壤产电60 h后,分别向体积为145 ml的淹水层中加入5 ml Cu2+ 浓度为300(T1)、600(T2)、1 200(T3)、2 400 mg/L(T4)的溶液。铜加入后,T1和T2处理的电压迅速降低,T3和T4处理的电压迅速上升,之后所有电压缓慢回到加铜前的水平。加铜后2 h,在淹水土壤中设置三电极体系并采用线性扫描伏安法(LSV)对污染物进行定性检测,结果显示,LSV曲线在0.162 ~ 0.182 V范围内出现单个氧化峰,峰电流值随溶液中Cu2+ 浓度增加而升高。为解释土壤产电信号变化特征,对加铜前后电流、阴极电势和内阻进行了检测,结果显示,加铜后,T1处理电流降低,阴极电势无明显变化;T2处理电流无明显变化,阴极电势上升;而T3、T4处理电流和阴极电势都出现了明显的升高,且T4处理的内阻最低。本研究为实现土壤产电信号在监测污染方面的实际应用提供了参考。
Abstract:
      This study combines the use of soil generated electrical signals and linear sweep voltammetry to explore a way to quickly response and identify copper pollution in wetland. Soil was collected in a forest in Nanjing City and flooded to simulate the wetland. The systems for soil to generate electricity were constructed and soil generated voltage data were recorded in time and continuously. Sixty hours after soil started to generate electricity, a volume of 5 ml Cu2+ solution was added into the overlaying water above the flooded soil to stimulate an event of copper pollution in wetland. The designed Cu2+ concentrations of the solution were 300 (T1), 600 (T2), 1 200 (T3) and 2 400 mg/L (T4), respectively. Soil generated voltage showed response immediately after Cu2+ addition, including the sudden decline for T1 and T2 treatments, and quick increase for T3 and T4 treatments. Later the voltage went back to the level before Cu2+ addition. Two hours after Cu2+ addition, a three-electrode mode was set in the flooded soil followed by the LSV to identify copper pollution, and the results showed that single oxidative peak appeared within the range from 0.162 V to 0.182 V in LSV curve and the peak current increased with increasing Cu2+ concentration. In order to interpret the response of soil generated voltage to Cu2+ addition, soil generated current, cathodic potential and impedance were measured before and after copper addition. After the addition of Cu2+, the current of T1 treatment decreased while its cathodic potential was not dramatically changed; the current of T2 treatment did not changed while its cathodic potential increased; the current and cathodic potential increased for both T3 and T4 treatment, and the internal resistance was the lowest for T4 treatment. This study may provide a reference for using soil generated electrical signals to monitor pollution.
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