采用硼氢化钠还原法制备粒径10 nm的银纳米粒比色传感器,用于检测水中Cd2+.将脱氢胆酸修饰于银纳米粒表面,通过脱氢胆酸与Cd2+之间的特异性络合作用,诱导银纳米粒团聚,溶液由黄色变为酒红色,实现水中Cd2+的比色识别.该方法检测Cd2+的线性范围为0.9~50 μmol/L,检出限可达129 nmol/L.在实际水样中裸眼可观察的检测下限低至1 μmol/L,有望应用于水体中Cd2+的原位现场快速检测.
A simple colorimetric method was developed to determine cadmium (II) (Cd2+) in aqueous solution, based on 10 nm diameter silver nanoparticles (Ag NPs) synthesized by reduction method with sodium borohydride.Dehydrocholic acid was employed to modify silver nanoparticles with a distinct colorimetric response to Cd2+.The presence of Cd2+ions induces the aggregation of the modified Ag NPs by the complexation of Cd2+ with dehydrocholic acid and results in a color change from yellow to wine-red.The detection limit (3σ) of the method could be as low as 129 nmol/L for Cd2+ with linear detection range of 0.9-50 μmol/L.Moreover,the method was applied to the determination of Cd2+ in drinking water with a visual detection limit of 1 μmol/L.The presented method is promising in the application of onsite fast detection of Cd2+ in water.
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