European Journal of Chemistry

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

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Published: Mar 31, 2021
DOI: https://doi.org/10.5155/eurjchem.12.1.1-12.2031
Keywords:
Food samples, Biological samples, Spectrofluorimetry, Environmental samples, Molybdenum determination, N-(Pyridin-2-yl)-quinoline-2-carbothioamide
Section
Research Article
Issue
Vol. 12 No. 1 (2021): March 2021
Dates
Received 2020-08-19
Accepted 2020-12-20
Published 2021-03-31
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Main Article Content

Muhammad Jamaluddin Ahmed
Laboratory of Analytical Chemistry, Department of Chemistry, University of Chittagong, Chittagong, 4331, Bangladesh
https://orcid.org/0000-0002-3765-066X
Ayesha Afrin
Department of Applied Chemistry and Chemical Engineering, University of Chittagong, Chittagong, 4331, Bangladesh
https://orcid.org/0000-0002-4820-063X
Muhammad Emdadul Haque
Laboratory of Analytical Chemistry, Department of Chemistry, University of Chittagong, Chittagong, 4331, Bangladesh
https://orcid.org/0000-0003-1207-7083

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.


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Ahmed, M. J.; Afrin, A.; Haque, M. E. 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, 1-12.

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