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Spectrochim Acta A Mol Biomol Spectrosc. 2019 Apr 15;213:104-110. doi: 10.1016/j.saa.2019.01.022. Epub 2019 Jan 17.

A novel spectral method for determination of trace malathion using EryB as light scattering probe by resonance Rayleigh scattering technique.

Author information

1
Key Laboratory of Water Environment Evolution and Pollution Control in Three Gorges Reservoir, Chongqing Three Gorges University, Wanzhou, Chongqing 404100, PR China.
2
Key Laboratory of Water Environment Evolution and Pollution Control in Three Gorges Reservoir, Chongqing Three Gorges University, Wanzhou, Chongqing 404100, PR China; School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, PR China. Electronic address: flyjd6400@163.com.

Abstract

A convenient and sensitive spectrophotometric methods was proposed for determination of Malathion (Mala) using Erythrosin B (EryB) as a probe through the Resonance Rayleigh scattering (RRS) technique. The interaction between EryB, Pd2+and malathion in the system was investigated by fluorescence, RRS and UV-Vis spectroscopy. Under the optimum conditions, the RRS intensity of EryB, Pd2+ and malathion was weak when exist in alone or any two kinds, however, the RRS intensity of the EryB-Pd2+-Mala system had an obvious enhancement due to Pd2+ could interact with the hydrolysis products of Mala and EryB each other form a new complexes. At the same time, the fluorescence intensity of EryB was decreased significantly in the presence of Pd2+, and the fluorescence intensity of EryB-Pd2+ system further decreased when Mala added, interestingly. So it was further proved that there was a forming complex in EryB-Pd2+-Mala system. Under the optimal conditions, the RRS enhanced intensity of the system was linearly proportional to the Mala's concentration in the range of 0.012-0.8 μg/mL, and the LOD was 1.7 ng/mL, with the correlation coefficient was R2 = 0.9960. So, a new method for determination of Mala was established and this method has been demonstrated in real sample with satisfactory results.

KEYWORDS:

Erythrosin B; Malathion; Pd(2+); RRS

PMID:
30684878
DOI:
10.1016/j.saa.2019.01.022
[Indexed for MEDLINE]

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