Determination of thiourea by terbium (III)/ prulifloxacin sensitized potassium permanganate-sulfite chemiluminescence with quenching method

Qi Hu; Si Chen; Fang Chen

doi:10.1016/j.saa.2021.120332

Determination of thiourea by terbium (III)/ prulifloxacin sensitized potassium permanganate-sulfite chemiluminescence with quenching method

Spectrochim Acta A Mol Biomol Spectrosc. 2022 Jan 5:264:120332. doi: 10.1016/j.saa.2021.120332. Epub 2021 Aug 28.

Authors

Qi Hu¹, Si Chen¹, Fang Chen²

Affiliations

¹ Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica; Key laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology), Ministry of Education, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, 430074 Wuhan, China.
² Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica; Key laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology), Ministry of Education, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, 430074 Wuhan, China. Electronic address: fchen@hust.edu.cn.

PMID: 34488001
DOI: 10.1016/j.saa.2021.120332

Abstract

Based on the thiourea quenching of the chemiluminescence of Tb³⁺/ prulifloxacin (PUFX) sensitized KMnO₄-Na₂SO₃ system, a convenient and rapid chemiluminescence method for the determination of thiourea was proposed. The reaction between KMnO₄ and Na₂SO₃ brought only weak chemiluminescence, but the chemiluminescence increased sharply in the presence of sensitizer Tb³⁺/ PUFX. Addition of thiourea can prevent the reaction between KMnO₄ and Na₂SO₃, thus the chemiluminescence intensity was significantly decreased. Under the optimum conditions, the calibration graphs for thiourea were linear in the range of 1.0 × 10^-7 to 4.0 × 10^-5 mol•L^-1. The limit of detection was 6.4 × 10^-8 mol•L^-1. The method was applied satisfactorily to the determination of thiourea in tap water, lake water and rice noodles and the spiked recoveries were between 104.7 ~ 113.4%. The possible mechanism of sensitization and quenching was also proposed.

Keywords: Chemiluminescence; Potassium permanganate; Prulifloxacin; Sulfite; Terbium; Thiourea.

MeSH terms

Dioxolanes
Fluoroquinolones
Luminescence
Luminescent Measurements
Piperazines
Potassium Permanganate*
Sulfites
Terbium*
Thiourea

Substances

Dioxolanes
Fluoroquinolones
Piperazines
Sulfites
Potassium Permanganate
Terbium
Thiourea
prulifloxacin