快速检测痕量镉的光电型传感器的建立

利用1-4-(硝基苯)-3-(3-甲基吡啶)三氮烯与镉络合显色的原理,将1-4-(硝基苯)-3-(3-甲基吡啶)三氮烯固定化制成试纸条,插入自制的便携式单色光反射计,组装出检测镉的光电型传感器。结果表明:当镉浓度范围为0.0179～0.2857mmol/L时,光反射率与镉浓度呈现良好的线性关系。优化检测条件后,该方法的检出限为0.00348mmol/L,检测时间为2min。此种方法检测镉所需时间短、操作简便,有望实现镉的现场检测。

Development of Photoelectrical Sensor for the Determination of Cadmium

A test strip for the detection of cadmium was developed by immobilizing 1-(4-nitrophenyl)-3-(3-methyl-pyridyl) triazene,a chromogenic agent specific for cadmium,onto a supporting pad.After the test strip was inserted into a self-made photoelectrical sensor,the reflectivity was recorded as the sensor signal.A standard calibration curve was established between reflectivity and cadmium concentration in standard solution.The results showed that this photoelectrical sensor could detect cadmium over the concentra...