Novel all-state heavy metal sensors and analysis instrument

Heavy metals, which accumulate into human body and cause many diseases for never degradation, can lead to undesirable hazard to human being. Novel all-state mercury ion selective electrode (Hg-ISE) and Cadmium ion selective electrode (Cd-ISE) are prepared and analysis instrument based on the two electrodes is developed. The detection limit of Hg-ISE is 3.31 times 10^-6 mol/L with the scope of 29.3 mV/decade in the linearity of calibration curve. The detection limit of Cd-ISE is 5.56 times 10^-6 mol/L with the scope of 27.5 mV/decade. Two electrodes with simple structure are convenient to be used. The water sample to measure is only needed to 10 ml. When the concentration of heavy metal is higher, it needs only several seconds that response voltage is able to keep stable. Test results show the two electrodes have advantages of high chemical stabilization and selectivity, repetitiveness of voltage, corrosion resistance. The analysis instrument has features of short detection time, sufficient function, convenient interface and stable performance.