This work describes an ultrasensitive trace determination of cadmium ion in aqueous medium through hybrid nanocomposite. Biodegradable materials such as chitosan and PVA are used to functionalize gold nanoparticles and to form a hybrid nanocomposite. Optical fiber is used to make sensor probe. To reduce toxicity of the gold nanoparticles towards environment, we adopt a green way to synthesize gold nanoparticles. In the optical set up, we have used white LED as light source and optical detector to record output response. From experimental results, we have found that this sensor probe has selectivity towards cadmium. It is found that sensitivity of this probe is ~ 0.028 intensity/ppb. From the linear fit, regression value is found to be ~ 0.99. This sensor probe has offered a limit of detection 800 ppt, which is below the WHO and EPA permissible limit 5 ppb.

这项工作描述了通过混合纳米复合物对水介质中的镉离子进行超灵敏的痕量测定。可生物降解的材料（例如壳聚糖和PVA）用于功能化金纳米颗粒并形成杂化纳米复合材料。光纤用于制造传感器探头。为了减少金纳米颗粒对环境的毒性，我们采用绿色方式合成金纳米颗粒。在光学设置中，我们使用白色LED作为光源和光学检测器来记录输出响应。从实验结果，我们发现该传感器探头对镉具有选择性。发现该探针的灵敏度为〜0.028强度/ ppb。根据线性拟合，回归值约为0.99。该传感器探头的检测极限为800 ppt，