Wireless Instrumentation Design For Heavy Metal Detection Of Pb In Water Based On Light Addressable Potentiometrie Sensor

Nowadays, with the development of industry, the pollution of heavy metals in water is more and more seriously, which has already affected the survival of human health. How to detect the heavy metals concentration in water is urgent. Combined with the wireless sensor networks, the thesis designs a wireless instrumentation for heavy metals detection in water based on light addressable potentiometric sensor (LAPS). The thesis includes the following parts:Firstly, the thesis introduces the situation of heavy metals pollution in our country and some proven technique of heavy metals detection. Then, introduces the wireless sensor networks and gives a detailed introduction of the theory of LAPS and the sensitive membrane of heavy metals. To meet the requirement of the project, a novel system based on LAPS is proposed and fabricated for determination of heavy metals in water environment. Also an independent fluidic system and wireless sensor network has been designed for the instrument.The thesis also in detail introduces the detection circuit module, aiming at the independent fluidic system and the automatic detection need, a software with the automatic range controlling function has been designed. A wireless communication has also been made with the Advanced RISC Machines(ARM).Finally, with a series of tests including the independent fluidic system, detection recovery, pH, Pb2+and other interference detection, it can be sure that the instrument can satisfy the fast automatic detection need of pH and Pb2+. The detection range of pH unit is5to9, with a sensitivity of37.321mV/pH and mean error of4.4%. The detection range of Pb2+unit is10-7to10-1mol/L, with a sensitivity of26.43mV/pPb2+and average recovery rate of86.7%.