选择4-羟基苯甲酸（4-HBA）和3，4-二羟基苯甲酸（3，4-DHBA）作为捕集剂和探针分子，采用化学活化法制备了玉米秸秆基生物多孔碳（PBC），并以此构建了多孔碳修饰电极（PBC/GCE），对修饰材料进行了表征，优化了富集时间、富集电位、缓冲溶液的pH等电化学条件。在最佳条件下，探针分子3，4-DHBA在50~850 μmol/L浓度范围内显示出良好的线性关系，检测限为21.25 μmol/L （S/N=3）。经验证，该方法成功应用于外场环境中OH·的检测。

Corn straw-based porous biological carbon (PBC) is prepared via chemical activation method, and used to establish PBC modified electrodes by using 4-hydroxybenzoic acid as collectors and 3, 4-dihydroxybenzoic acid (3, 4-DHBA) as probe for detection.The modified material is characterized, and the electrochemical conditions such as enrichment time, enrichment potential and pH value of buffer solution are optimized.It is shown that under the best conditions, 3, 4-DHBA shows a good linear relationship in the concentration range of 50-850 μmol·L^-1, with a detection limit of 21.25 μmol·L^-1(S/N=3).The method is proved to be successfully applied to the detection of OH· in the field environment.

李瑞红(1994-),女,硕士生