锑原位掺杂SiO2@PDA-Sb复合材料修饰电极用于海水中Zn离子检测

本研究提出了一种用于检测海水中锌离子（Zn²⁺）含量的电化学检测方法。该方法首先应用水热法合成SiO₂@PDA-Sb复合材料，然后将该复合材料修饰到玻碳电极上制备SiO₂@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Zn²⁺进行测定。研究结果表明，Zn²⁺在SiO₂@PDA-Sb-Nafion/GCE上具有较强的溶出峰。在最优条件下，SiO₂@PDA-Sb-Nafion/GCE对Zn²⁺浓度在1~1 000 nmol/L范围内可实现灵敏、准确的检测，Zn²⁺的检测出限为0.71 nmol/L。加标回收率实验显示Zn²⁺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Zn²⁺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Zn²⁺具有较好的应用前景。

Antimony in situ doped SiO2@PDA-Sb composite modified electrode for detection of Zn ions in seawater

This study presents an electrochemical detection method for detecting zinc content in seawater. This method firstly uses hydrothermal method to synthesize SiO₂@PDA-Sb composite material, and then the composite was modified on glassy carbon electrode to prepare SiO₂@PDA-Sb-Nafion/GCE for the determination of Zn²⁺ in seawater samples from the Pearl River Estuary using differential pulse anodic dissolution voltammetry (DPASV). The results show that Zn²⁺ has a strong dissolution peak on SiO₂@PDA-Sb-Nafion/GCE. Under optimal conditions, SiO₂@PDA-Sb-Nafion/GCE detected sensitively and accurately the Zn²⁺ in range of 1-1 000 nmol/L with detection limit of 0.71 nmol/L. The spike recovery experiment showed that the spike recovery rate of Zn²⁺ was 93.19%-100.12%, indicating that this method is applicable to the determination of Zn²⁺ 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 Zn²⁺ in seawater.