Abstract The nitrogen doped carbon dots regulated by formaldehyde were synthesized using citric acid and melamine by a simple hydrothermal method. The obtained carbon dots (MFCD) significantly enhanced the weak chemiluminescence (CL) reaction of K2Cr2O7 with NaHSO3 by means of energy transform from the intermediate of excited sulphur dioxide (SO2*) and the radiative recombination of oxidant-injected holes and electrons. Interestingly, it was discovered that iodide was effective in enhancing the CL intensity of this system. Based on this finding, the MFCD-based CL system as a sensitive and selective probe was applied for detection of nM levels of iodide ions. Under optimum conditions, the probe had a linear calibration range from 0.03 to 5.0 μM with a detection limit of 5.6 nM. The developed CL method was applied for the detection of iodide in milk and mineral water samples.

中文翻译：

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灵敏测定碘化物的碳点增强化学发光法

摘要 以柠檬酸和三聚氰胺为原料，采用简单的水热法合成了甲醛调控的氮掺杂碳点。获得的碳点（MFCD）通过激发二氧化硫（SO2*）中间体的能量转换和注入氧化剂的空穴和电子的辐射复合，显着增强了K2Cr2O7与NaHSO3的弱化学发光（CL）反应。有趣的是，发现碘化物可有效提高该系统的 CL 强度。基于这一发现，基于 MFCD 的 CL 系统作为一种灵敏且选择性的探针被应用于检测 nM 水平的碘离子。在最佳条件下，探针的线性校准范围为 0.03 至 5.0 μM，检测限为 5.6 nM。