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A highly sensitive and selective spectrofluorimetric method for the determination of molybdenum at pico-trace levels in various matrices using N-(pyridin-2-yl)-quinoline-2-carbothioamide


Muhammad Jamaluddin Ahmed (1,*) orcid , Ayesha Afrin (2) orcid , Muhammad Emdadul Haque (3) orcid

(1) Laboratory of Analytical Chemistry, Department of Chemistry, University of Chittagong, Chittagong, 4331, Bangladesh
(2) Department of Applied Chemistry and Chemical Engineering, University of Chittagong, Chittagong, 4331, Bangladesh
(3) Laboratory of Analytical Chemistry, Department of Chemistry, University of Chittagong, Chittagong, 4331, Bangladesh
(*) Corresponding Author

Received: 19 Aug 2020 | Revised: 14 Nov 2020 | Accepted: 20 Dec 2020 | Published: 31 Mar 2021 | Issue Date: March 2021

Abstract


A new spectrofluorimetric reagent N-(pyridin-2-yl)-quinoline-2-carbothioamide (PQTA) has been synthesized and characterized. A very simple, ultra-sensitive, and highly selective, and non-extractive new spectrofluorimetric method for the determination of molybdenum at pico-trace levels using PQTA has been developed. This novel fluorimetric reagent PQTA, becomes oxidized in a slightly acidic (0.0025-0.05 M H2SO4) solution with molybdenum (VI) in absolute ethanol to produce a highly fluorescent oxidized product (λex = 300 nm; λem= 377 nm). Constant and maximum fluorescence intensities were observed over a wide range of acidity (0.0025-0.0500 M H2SO4) for the period between 2 min and 24 h. Linear calibration graphs were obtained for 0.001-600 μg/L of Mo having a detection limit of 0.15 ng/L; the quantification limit of the reaction system was found to be 1.5 ng/L and the RSD was 0-2%. A large excess of over 60 cations, anions, and complexing agents like chloride, phosphate, azide, tartrate, oxalate, and SCN- etc. do not interfere in the determination. The developed method was successfully used in the determination of molybdenum in several Certified Reference Materials (Alloys, steel, serum, bovine liver, drinking water, soil, and sediments) as well as in some environmental waters (Potable and polluted), biological fluids (Human blood, urine, hair, and milk), soil samples and food samples (Vegetables, rice, and wheat) solutions containing both molybdenum (VI) and molybdenum (V) ions. The results of the proposed method for assessing biological, food and vegetable samples were comparable with ICP-OES and AAS were found to be in excellent agreement.


Keywords


Food samples; Biological samples; Spectrofluorimetry; Environmental samples; Molybdenum determination; N-(Pyridin-2-yl)-quinoline-2-carbothioamide

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DOI: 10.5155/eurjchem.12.1.1-12.2031

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[1]. Mohammed Jamaluddin Ahmed, Muhammad Lajin Mia
A new simple, highly sensitive and selective spectrofluorimetric method for the speciation of thallium at pico-trace levels in various complex matrices using N-(pyridin-2-yl)-quinoline-2-carbothioamide
RSC Advances  11(51), 32312, 2021
DOI: 10.1039/D1RA05388D
/


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How to cite


Ahmed, M.; Afrin, A.; Haque, M. Eur. J. Chem. 2021, 12(1), 1-12. doi:10.5155/eurjchem.12.1.1-12.2031
Ahmed, M.; Afrin, A.; Haque, M. A highly sensitive and selective spectrofluorimetric method for the determination of molybdenum at pico-trace levels in various matrices using N-(pyridin-2-yl)-quinoline-2-carbothioamide. Eur. J. Chem. 2021, 12(1), 1-12. doi:10.5155/eurjchem.12.1.1-12.2031
Ahmed, M., Afrin, A., & Haque, M. (2021). A highly sensitive and selective spectrofluorimetric method for the determination of molybdenum at pico-trace levels in various matrices using N-(pyridin-2-yl)-quinoline-2-carbothioamide. European Journal of Chemistry, 12(1), 1-12. doi:10.5155/eurjchem.12.1.1-12.2031
Ahmed, Muhammad, Ayesha Afrin, & Muhammad Emdadul Haque. "A highly sensitive and selective spectrofluorimetric method for the determination of molybdenum at pico-trace levels in various matrices using N-(pyridin-2-yl)-quinoline-2-carbothioamide." European Journal of Chemistry [Online], 12.1 (2021): 1-12. Web. 17 Oct. 2021
Ahmed, Muhammad, Afrin, Ayesha, AND Haque, Muhammad. "A highly sensitive and selective spectrofluorimetric method for the determination of molybdenum at pico-trace levels in various matrices using N-(pyridin-2-yl)-quinoline-2-carbothioamide" European Journal of Chemistry [Online], Volume 12 Number 1 (31 March 2021)

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