锑原位掺杂SiO_(2)@PDA-Sb复合材料修饰电极用于海水中Zn离子检测

Antimony in situ doped SiO_(2)@PDA-Sb composite modified electrode for detection of Zn ions in seawater

本研究提出了一种用于检测海水中锌离子(Zn^(2+))含量的电化学检测方法。该方法首先应用水热法合成SiO_(2)@PDA-Sb复合材料,然后将该复合材料修饰到玻碳电极上制备SiO_(2)@PDA-Sb-Nafion/GCE,利用差分脉冲阳极溶出伏安法(DPASV)对珠江口海水水样中Zn^(2+)进行测定。研究结果表明,Zn^(2+)在SiO_(2)@PDA-Sb-Nafion/GCE上具有较强的溶出峰。在最优条件下,SiO_(2)@PDA-Sb-Nafion/GCE对Zn^(2+)浓度在1~1000 nmol/L范围内可实现灵敏、准确的检测,Zn^(2+)的检测出限为0.71 nmol/L。加标回收率实验显示Zn^(2+)加标回收率为93.19%~100.12%,表明该方法可应用于现场海水样品Zn^(2+)测定。本方法具有电极制作简单、稳定性和抗干扰性良好,能够提高现有测定方法的检测限和精确度,在现场海水检测痕量Zn^(2+)具有较好的应用前景。

This study presents an electrochemical detection method for detecting zinc content in seawater.This method firstly uses hydrothermal method to synthesize SiO_(2)@PDA-Sb composite material,and then the composite was modified on glassy carbon electrode to prepare SiO_(2)@PDA-Sb-Nafion/GCE for the determination of Zn^(2+)in seawater samples from the Pearl River Estuary using differential pulse anodic dissolution voltammetry(DPASV).The results show that Zn^(2+)has a strong dissolution peak on SiO_(2)@PDA-Sb-Nafion/GCE.Under optimal conditions,SiO_(2)@PDA-Sb-Nafion/GCE detected sensitively and accurately the Zn^(2+)in range of 1-1000 nmol/L with detection limit of 0.71 nmol/L.The spike recovery experiment showed that the spike recovery rate of Zn^(2+)was 93.19%-100.12%,indicating that this method is applicable to the determination of Zn^(2+)in seawater samples on site.The method has the advantages of simple electrode fabrication,good stability and good anti-interference,and can improve the detection limit and accuracy of the existing determination method.It has a good application prospect for detecting trace Zn^(2+)in seawater.