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首页> 外文期刊>The Analyst: The Analytical Journal of the Royal Society of Chemistry: A Monthly International Publication Dealing with All Branches of Analytical Chemistry >Flow-injection analysis of hydrogen peroxide based on carbon nanospheres catalyzed hydrogen carbonate-hydrogen peroxide chemiluminescent reaction
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Flow-injection analysis of hydrogen peroxide based on carbon nanospheres catalyzed hydrogen carbonate-hydrogen peroxide chemiluminescent reaction

机译：基于碳纳米球催化的碳酸氢盐-过氧化氢化学发光反应的过氧化氢流动注射分析

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摘要

A flow-injection chemiluminescence (CL) system with high sensitivity, selectivity, rapidity, and reproducibility is proposed for the determination of hydrogen peroxide (H_2O_2) in water samples. The system is based on the reaction of hydrogen peroxide and hydrogen carbonate solution. Carbon nanospheres (CNSs) prepared from aqueous glucose solution are used to enhance the weak CL. The CL intensity was found to be directly proportional to the concentration of H_2O_2 present in the sample solutions. The effects upon the CL of several physicochemical parameters, including the concentration of the reagents, the mixing order of the reagents, flow rate, pH, particle size of CNSs and other relevant variables, were studied and optimized. The proposed method exhibited advantages in a larger linear range of 5.0 × 10~(-8) to 3.0 × 10~(-6) mol L~(-1) and a lower limit of detection of 1.0 × 10~(-9) mol L~(-1) (S/N = 3). This method has been successfully applied to the evaluation of H _2O_2 in tap water and snow water with recoveries from 80 to 110%. The relative standard deviation (RSD) was less than 8% for intra- and inter-assay precision. Based on the kinetic curve, the CL spectrum, fluorescence spectrum, UV-visible spectrum, and electron spin resonance (ESR) spectrum of NaHCO3-H_2O_2-CNSs system, a possible CL mechanism was proposed. Superoxide ion radical (O_2~-) and hydroxide radical (OH) were generated during the reaction of NaHCO_3 and H_2O_2. They were the key intermediates for the production of hole-injected and electron-injected CNSs in the CL process.
机译：提出了一种具有高灵敏度，选择性，快速性和重现性的流动注射化学发光（CL）系统，用于测定水样中的过氧化氢（H_2O_2）。该系统基于过氧化氢和碳酸氢盐溶液的反应。由葡萄糖水溶液制备的碳纳米球（CNS）用于增强弱CL。发现CL强度与样品溶液中存在的H_2O_2浓度成正比。研究并优化了包括试剂浓度，试剂混合顺序，流速，pH，CNS粒径等几个物理化学参数对CL的影响。该方法在5.0×10〜（-8）mol L〜（-1）的较大线性范围内以及1.0×10〜（-9）的检测下限方面具有优势。摩尔L〜（-1）（S / N ＝ 3）。该方法已成功应用于自来水和雪水中H _2O_2的评估，回收率在80％至110％之间。批内和批间精密度的相对标准偏差（RSD）小于8％。基于NaHCO3-H_2O_2-CNSs体系的动力学曲线，CL光谱，荧光光谱，紫外可见光谱和电子自旋共振（ESR）光谱，提出了可能的CL机理。 NaHCO_3与H_2O_2反应生成超氧离子自由基（O_2〜-）和氢氧自由基（OH）。它们是在CL工艺中生产空穴注入和电子注入的CNS的关键中间体。

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