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根据邻苯二酚对Cd Te量子点增敏的Ru(bpy)32+阴极电致化学发光强度有较强的抑制作用,建立了一种简单的测定邻苯二酚的电致化学发光分析方法。分别探究了磷酸盐缓冲溶液的浓度、pH、量子点的浓度、Ru(bpy)_3~(2+)的浓度、扫描速率以及电位等因素对该体系发光行为的影响。在优化实验条件下,电致化学发光强度的对数与邻苯二酚浓度的对数在7.0×10~(-8)~4.0×10~(-5)mol/L范围内呈现良好的线性关系,检出限为2.3×10~(-8)mol/L(3σ)。对4.0×10~(-6)mol/L的邻苯二酚标准溶液进行六次平行测定,其电致化学发光强度的相对标准偏差(RSD)为1.1%。该方法可成功应用于模拟环境水样中邻苯二酚的含量测定,加标回收率介于95.0%~105.7%之间。
According to the strong inhibitory effect of catechol on the luminescence intensity of Ru (bpy) 32+ sensitive to CdTe quantum dots, a simple method for the determination of catechol by electrochemiluminescence . The effects of phosphate buffer concentration, pH, quantum dot concentration, Ru (bpy) _3 ~ (2+) concentration, scanning rate and potential on the luminescence behavior of the system were investigated. Under the optimal experimental conditions, the logarithm of ECL intensity and catechol concentration showed good linearity in the range of 7.0 × 10 -8 ~ 4.0 × 10 -5 mol / L The detection limit was 2.3 × 10 ~ (-8) mol / L (3σ). The RSD of 4.0 × 10 -6 mol / L of catechol standard solution was determined in parallel for six times, and the relative standard deviation (RSD) of its electrochemiluminescence intensity was 1.1%. The method can be successfully applied to the determination of catechol in simulated environmental water samples with recoveries between 95.0% and 105.7%.