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研制了一种新型的石墨烯/聚邻苯二胺膜饰碳糊电极(GR/PPD/CPE)。在NaH2PO4-Na2HPO4缓冲溶液(pH 7.3)中,利用循环伏安法研究了对苯二酚(HQ)和邻苯二酚(CC)在该修饰电极上的电化学行为,利用线性扫描溶出伏安法研究了扫速与峰电流或峰电位的关系,利用微分脉冲溶出伏安法测定了HQ和CC的含量,线性范围分别为6.5×10-7~5.0×10-4mol/L和1.0×10-7~5.0×10-4mol/L,检出限(S/N=3)分别为8.0×10-8mol/L和2.0×10-7mol/L。方法用于自来水样中的HQ和CC的测定,回收率在96.5%~102.5%之间。
A novel graphene / poly-o-phenylenediamine film decorated carbon paste electrode (GR / PPD / CPE) was developed. The electrochemical behavior of hydroquinone (HQ) and catechol (CC) on the modified electrode was investigated by cyclic voltammetry in NaH2PO4-Na2HPO4 buffer solution (pH 7.3). The linear sweep stripping voltammetry The relationship between scan rate and peak current or peak potential was studied. The contents of HQ and CC were determined by differential pulse stripping voltammetry with linear ranges of 6.5 × 10-7 ~ 5.0 × 10-4 mol / L and 1.0 × 10 -7 ~ 5.0 × 10-4mol / L, and the detection limits (S / N = 3) were 8.0 × 10-8mol / L and 2.0 × 10-7mol / L, respectively. The method was applied to the determination of HQ and CC in tap water samples. The recoveries ranged from 96.5% to 102.5%.