Determination of bromate via the chemiluminescence generated in the sulfite and carbon quantum dot system
Determination of bromate via the chemiluminescence generated in the sulfite and carbon quantum dot system
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通过亚硫酸盐和碳量子点系统中产生的化学发光测定溴酸盐
DOI：
10.1007/s00604-017-2653-x
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发表时间：
2018-02-01
影响因子：
5.7
通讯作者：
Cheng, Xianglei
中科院分区：
文献类型：
--
作者：
Li, Liping;Lai, Xiaojing;Cheng, Xianglei
作者描述了一种基于化学发光（CL）的溴酸盐测定方法。该方法基于使用碳量子点（CQD）和亚硫酸盐的溶液。当溴酸盐注入溶液中时，观察到强CL（峰位于490 nm处）。CL在0.3至10 μmol L− 1溴酸盐浓度范围内线性增加，给出0.1 μmol L− 1检测限（S/N比为3）。一个可能的CL机制建议，涉及CQDs，溴酸盐和亚硫酸盐在酸性介质中的氧化还原反应。这导致空穴注入和电子注入的CQD的形成。氧化剂注入的空穴和电子在CQDs中的辐射复合解释了CL的发生。这一机制与之前的假设相矛盾，即能量从SO2* 转移到CQD。亚硝酸根对溴酸根的测定有干扰作用，但可加入氨基磺酸消除。在酸性条件下，碳量子点（CQDs）可分别与亚硫酸盐和溴酸盐反应生成空穴注入型（CQDs·-）和电子注入型（CQDs·+）。此后，CQDs·-和CQDs·+之间的辐射电子-空穴湮灭引起了强烈的化学发光（490 nm）。
The authors describe a chemiluminescence (CL)-based assay for the determination of bromate. The method is based on the use of a solution of carbon quantum dots (CQDs) and sulfite. Strong CL (peak at 490 nm) is observed when bromate is injected into the solution. The CL increases linearly in the 0.3 to 10 μmol L−1bromate concentration range, giving a 0.1 μmol L−1limit of detection (at an S/N ratio of 3). A possible CL mechanism is suggested that involves a redox reaction between the CQDs, bromate and sulfite in the acidic medium. This leads to the formation of hole-injected and electron-injected CQDs. Radiative recombination of oxidant-injected holes and electrons in the CQDs accounts for the occurrence of CL. This mechanism contradicts the previous assumption that the transfer of energy occurs from SO2* to the CQDs. Although nitrite may interfere in the determination of bromate, its effect can be eliminated by adding sulfamic acid. The assay is sensitive and represents a new tool for the determination of bromate, which is a carcinogen.Graphical abstractUnder acidic condition, carbon quantum dots (CQDs) can react with sulfite and bromate transforming to hole-injected CQDs (CQDs•–) and electron-injected CQDs (CQDs•+), respectively. Thereafter, strong chemiluminescence (490 nm) aroused from the radiative electron-hole annihilation between CQDs•–and CQDs•+.