ZnS量子点修饰的玻碳电极电化学法测定废水中的磺胺二甲嘧啶

Electrochemical determination of sulfamethazine in wastewater with ZnS quantum dots modified glassy carbon electrode

目的建立测定废水中磺胺二甲嘧啶的ZnS量子点修饰的玻碳电极电化学法。方法采用水相化学共沉淀法合成ZnS量子点,循环伏安法研究磺胺二甲嘧啶在ZnS量子点修饰的玻碳电极上的电化学性质,差分脉冲伏安法建立磺胺二甲嘧啶的电化学测定方法。结果水相化学共沉淀法合成的ZnS量子点有较强的荧光。ZnS量子点修饰的玻碳电极在p H 1.98的B-R缓冲液中,产生1个氧化峰,峰电位为1.0 V。当浓度范围为0.2~10μmol/L时,磺胺二甲嘧啶的峰电流与其浓度呈良好的线性关系,线性方程为Ipa=0.647 9 c+0.074 98,r=0.999 1,检测限为0.06μmol/L,加样回收率在100.7%~103.1%之间。结论 ZnS量子点修饰的玻碳电极对磺胺二甲嘧啶有较好的电化学响应,响应快、灵敏度高,可用于测定废水中残留的磺胺二甲嘧啶。

Objective To establish the electrochemical determination of sulfamethazine with ZnS quantum dots modified glassy carbon electrode. Methods ZnS quantum dots were synthesized with water phase chemical co-precipitation method,and the electrochemical properties of Sulfamethazine at ZnS quantum dots modified glassy carbon electrode were studied with the cyclic voltammetry. The electrochemical method for the determination of sulfamethazine was developed by differential pulse voltammetry. Results ZnS quantum dots synthesized by aqueous coprecipitation had strong fluorescence. In B-R buffer solution at p H 1.98,the ZnS quantum dots modified glassy carbon electrode exhibited better electrocatalytic effect toward the oxidation of Sulfamethazine,and the oxidation peak of Sulfamethazine was at 1.0 V. The peak current had a good linear relationship with the Sulfamethazine concentration from 0.2-10 μmol/L,the linear equation was Ipa= 0.647 9 c＋ 0.074 98 with the correlation coefficient of 0.999 1,and the detection limit was 0.06 μmol/L.The recoveries of sulfonamides in wastewater samples ranged from 100.7% to 103.1%. Conclusion The ZnS quantum dots modified glassy carbon electrode has good electrochemical response, fast response and higher sensitivity. It has been applied to the determination of sulfamethazine in wastewater with satisfactory results.