Khataee Alireza, Lotfi Roya, Hasanzadeh Aliyeh, Iranifam Mortaza
Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, 51666-16471 Tabriz, Iran.
Photochem Photobiol Sci. 2016 Apr;15(4):496-505. doi: 10.1039/c5pp00452g. Epub 2016 Mar 2.
A simple and sensitive flow injection chemiluminescence (CL) method in which CdS quantum dots (QDs) enhanced the CL intensity of a KMnO4-formaldehyde (HCHO) reaction was offered for the determination of HCHO. This CL system was based on the catalytic activity of CdS QDs and their participation in the CL resonance energy transfer (CRET) phenomenon. A possible mechanism for the supplied CL system was proposed using the kinetic curves of the CL systems and the spectra of CL, photoluminescence (PL) and ultraviolet-visible (UV-Vis). The emanated CL intensity of the KMnO4-CdS QDs system was amplified in the presence of a trace level of HCHO. Based on this enhancement effect, a simple and sensitive flow injection CL method was suggested for the determination of HCHO concentration in environmental water and wastewater samples. Under selected optimized experimental conditions, the increased CL intensity was proportional to the HCHO concentration in the range of 0.03-4.5 μg L(-1) and 4.5-10.0 μg L(-1). The detection limits (3σ) were 0.0003 μg L(-1) and 1.2 μg L(-1). The relative standard deviations (RSD%) for eleven replicate determinations of 4.0 μg L(-1) HCHO were 2.2%. Furthermore, the feasibility of the developed method was investigated via the determination of HCHO concentration in environmental water and wastewater samples.
提出了一种简单灵敏的流动注射化学发光（CL）方法，该方法利用硫化镉量子点（QDs）增强高锰酸钾-甲醛（HCHO）反应的化学发光强度来测定HCHO。该化学发光体系基于硫化镉量子点的催化活性及其参与化学发光共振能量转移（CRET）现象。利用化学发光体系的动力学曲线以及化学发光、光致发光（PL）和紫外可见（UV-Vis）光谱，提出了所提供化学发光体系的可能机理。在痕量HCHO存在下，高锰酸钾-硫化镉量子点体系发出的化学发光强度被放大。基于这种增强效应，提出了一种简单灵敏的流动注射化学发光法，用于测定环境水和废水样品中的HCHO浓度。在选定的优化实验条件下，化学发光强度的增加与HCHO浓度在0.03 - 4.5 μg L⁻¹和4.5 - 10.0 μg L⁻¹范围内成正比。检测限（3σ）分别为0.0003 μg L⁻¹和1.2 μg L⁻¹。对4.0 μg L⁻¹ HCHO进行十一次重复测定的相对标准偏差（RSD%）为2.2%。此外，通过测定环境水和废水样品中的HCHO浓度，研究了所开发方法的可行性。
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