利用CdTe量子点增敏鲁米诺-过氧化氢化学发光体系测定水环境中的对苯二酚

Determination of Hydroquinone in The Aquatic Environment by Chemiluminescence of Luminol-H_2O_2 Sensitized by CdTe Quantum Dots

在碱性条件下,CdTe量子点对鲁米诺-过氧化氢化学发光体系具有显著的增敏作用,而对苯二酚对该体系的化学发光有强烈的抑制作用,以此建立了流动注射化学发光检测对苯二酚的新方法。在优化实验条件下,在1.0～25 nmol·L-1范围内对苯二酚的浓度与化学发光强度的抑制值ΔI呈良好的线性关系(R2=0.993 2),检出限为0.76 nmol·L-1,经实际应用证明,该方法可用于水环境中对苯二酚的测定。此外,对CdTe量子点增敏鲁米诺-过氧化氢化学发光体系的机理进行了探讨。

Based on the phenomenon that hydroquinone can obviously inhibit the CL signal of the luminol-H2O2 system sensitized by CdTe QDs in basic medium,a novel flow-injection chemiluminescence method for the determination of hydroquinone has been developed.Under the optimum conditions,the linear range for the determination of hydroquinone was 1.0～25 nmol·L-1 with a detection limit of 0.76 nmol·L-1 calculated as proposed by IUPAC and a relative standard deviation of 2.56% for 11 solutions of 4.0 nmol·L-1 hydroquinone.The proposed method can be used to determine hydroquinone content in water samples from the environment and satisfactory results were obtained without interferences from the sample matrix.Furthermore,the possible enhancement mechanism of CdTe QDs on luminol-H2O2 CL was further investigated.