Fluorescence determination of Fe() in drinking water using a new fluorescence chemosensor

• Published in: RSC advances Vol. 12; no. 42; pp. 27679 - 27686
• Main Authors: Khairy, Gasser M, Amin, Alaa S, Moalla, Sayed M. N, Medhat, Ayman, Hassan, Nader
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 22-09-2022
• Subjects: Aluminum; Buffer solutions; Chemical sensors; Chemoreceptors; Copper; Correlation coefficients; Drinking water; Fluorescence; Heavy metals; Hydrazines; Manganese; Metal ions; Selectivity; Stoichiometry; Water sampling; Zinc
• ISSN: 2046-2069; 2046-2069
• DOI: 10.1039/d2ra05144c

A new fluorescence chemosensor based on (
Z
)-2-(1-(3-oxo-3
H
-benzo[
f
]chromen-2-yl)ethylidene)hydrazine-1-carbothioamide (CEHC) has been developed for the determination of Fe(
iii
) in drinking water. The optimum conditions were acetate buffer solution with a pH 5.0. In this approach, the determination of Fe(
iii
) is based on static quenching of the luminescence of the probe upon increasing concentrations of Fe(
iii
). The CEHC sensor binds Fe(
iii
) in a 1 : 1 stoichiometry with a binding constant
K
a
= 1.30 × 10
4
M
−1
. CEHC responds to Fe(
iii
) in a way that is more sensitive, selective, and quick to turn off the fluorescence than to other heavy metal ions. Selectivity was proved against seven other metal ions (Mn(
ii
), Al(
iii
), Cu(
ii
), Ni(
ii
), Zn(
ii
), Pb(
ii
), and Cd(
ii
)). The calibration curve was constructed based on the Stern-Volmer equation. The linear range was 2.50-150 μM with the correlation coefficient of 0.9994, and the LOD was 0.76 μM. The method was successfully applied to determine Fe(
iii
) in drinking water samples, and the accuracy of the chemosensor was validated by atomic absorption spectrometry.
A new fluorescence chemosensor based on (
Z
)-2-(1-(3-oxo-3
H
-benzo[
f
]chromen-2-yl)ethylidene)hydrazine-1-carbothioamide (CEHC) has been developed for the determination of the fluorescence probe of Fe(
iii
) in drinking water.