基于光寻址电位传感器的水环境重金属无线检测仪器设计

针对水环境重金属检测问题,设计了一种新型的基于光寻址电位传感器(LAPS)的重金属检测仪器。相对于原子荧光光度法等其他方法,该仪器操作简便,无需繁杂的前处理过程,具有自动量程功能以及独立的水路系统。仪器通过ARM开发板与上位机无线通讯,检测过程自动化进行。经验证,仪器可以对水环境酸碱度以及重金属Pb2+浓度进行快速、自动化检测。其中pH的检测范围为5~9,灵敏度为37.321 mV/pH,平均误差为4.4%,满足水环境酸碱度的实测需求。重金属Pb2+的检测范围为10-7~10-1mol/L,灵敏度为26.43 mV/pPb2+,平均重复率为86.7%,并进行了Zn2+,Cu2+及pH对Pb2+检测的干扰测量。

Wireless Instrumentation Design for Heavy Metals Detection in Water Based on Light Addressable Potentiometric Sensor

A novel system based on light addressable potentiometric sensor (LAPS) was proposed and fabricated for determination of heavy metals in water environment. Compared with other detection methods such as atomic fluorescence spectrophotometry, this type of instrument is much easier to use, with the characteristics of automatic range controlling and uncomplicated pretreatment process. The instrument can communicate with computer via ARM wirelessly. Equipped with the independent fluidic system, it can detect pH and Pb2+ concentration in water samples with a fast and automatic response, which has been verified by the laboratory experiments. The detection range of pH unit was 5 to 9, with a sensitivity of 37.321mV/pH and mean error of 4.4%, which meet the requirement of pH detection. The detection range of Pb2+ unit was 10-7 to 10-1mol/L, with a sensitivity of 26.43mV/pPb2+ and average recovery rate of 86.7%. In the meantime, the interference of Zn2+, Cu2+ and pH to Pb2+ detection had also been investigated.