银纳米粒的合成及其在有机磷农药检测中的应用研究

Synthesis of Silver Nanoparticles and Application in Pesticide Residue Detection

以硝酸银、柠檬酸钠为原料,硼氢化钠为还原剂合成了柠檬酸盐封端的银纳米粒,采用紫外光谱、X射线衍射仪、透射电镜对合成的银纳米粒进行表征,并成功将其应用于水样中敌百虫的分析。结果表明:合成的银纳米粒呈球形、具有良好的分散性,平均粒径25 nm,在398 nm处有最大紫外吸收峰,A398 nm/A522 nm的吸光度比与浓度在0.20~18.0 ng/m L范围内的敌百虫线性相关,检测限为0.12 ng/m L,为简单而快速地分析有机磷农残建立了新方法。

Silver nanoparticles were successfully utilized to analyze trichlorfon in water samples,which were synthesized by using silver nitrate,sodium citrate,with sodium borohydride as the reducing agent.UV-vis spectroscopy,TEM and X-ray diffractometer were used to character the prepared silver nanoparticles,which showed that the prepared silver nanoparticles are spherical,with uniform particle size distribution,and the average particle size is 25 nm,the maximum absorption peak at 398 nm.The absorbance ratio A398 nm/A522 nm was found to be linearly related to concentration of 0.20-18.0 ng/mL in the range of trichlorfon with a detection limit of 0.12 ng/mL.The method can be used effectively and quickly for analyzing the actual water samples.