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介绍了一种用于快速检测溶液中硝酸盐含量的流体控制系统。系统选用自主研发的以聚吡咯聚合物为膜材料的硝酸盐离子选择性电极作为传感单元,通过底层数据采集器编程控制微型泵和微型阀,实现检测溶液的自动传输控制。根据流体控制流程,离子选择性电极的标定溶液浓度选择为10-1、10-3和10-4mol/L,标定时间可控制在4.5min以内,每个样品检测时间为90s。在10-4～10-1mol/L的硝酸盐浓度范围内,电极的电势响应斜率值相对稳定,系统的硝酸盐含量检测下限约为10-4mol/L,可基本满足对土壤浸提溶液和生活饮用水硝酸盐含量的快速和低成本检测要求。
A fluid control system for rapid detection of nitrate in solution is presented. System uses self-developed polypyrrole polymer membrane material nitrate ion selective electrode as the sensing unit, through the bottom of the data acquisition programmer controls the micro-pump and micro-valve, the detection solution to achieve automatic transmission control. According to the flow control procedure, the concentration of ion selective electrode calibration solution is selected as 10-1,10-3 and 10-4mol / L, the calibration time can be controlled within 4.5min, the detection time of each sample is 90s. In the range of 10-4 ~ 10-1mol / L nitrate concentration, the slope of the potential response of the electrode is relatively stable, and the lower limit of detection of nitrate in the system is about 10-4mol / L, which can basically meet the requirements of soil leaching solution and Fast and low-cost testing of nitrate content in drinking water.