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A promazine derivative oriented chemical sensor for ultra-sensitive chromium determination


The study reports a simple and highly selective spectrofluorometric method for trace determination and speciation of chromium (III & VI) species in water using 10-(3-dimethylaminopropyl) phenothiazine hydrochloride namely promazine hydrochloride (PMH) as a fluorescence tagging reagent. The method was based on the redox reaction between PMH and chromium(VI) in aqueous H3PO4 resulting in the formation of complex [Cr(III)-PMH] followed by fluorescence quenching at λex/em =300/449 nm. An exceptional value for the limit of detection (LOD) 0.03 µg L-1 was attained over a wide linear range 0.1-1.0 µg L-1 under the optimized conditions. A coefficient of variation (CV) of ± 2.05% (n=5) was obtained at 2.0 µg L-1 level of chromium(VI). Chemical speciation of chromium(III & VI) species were successfully accomplished after oxidation of chromium(III) to chromium(VI) with H2O2 in KOH solution at pH 9.0. The method was validated in environmental water samples with satisfactory recovery percentages (> 97.7%) using inductively coupled plasma-optical emission spectrometry (ICP-OES). The proposed and reference methods were subjected to statistical treatment (student’s t and F tests) at 95 % confidence with no significant difference indicating the precision and accuracy of the proposed optical probe.

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Publication details

The article was received on 26 Dec 2017, accepted on 14 Mar 2018 and first published on 14 Mar 2018

Article type: Paper
DOI: 10.1039/C7NJ05131J
Citation: New J. Chem., 2018, Accepted Manuscript
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    A promazine derivative oriented chemical sensor for ultra-sensitive chromium determination

    M. El-Shahawi, zeinab. M. Saigl, W. Ahmad, G. .I Mohammed, H. Alwael, A.H. Al-Bagawi and Dyab. A. Al-Eryani, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C7NJ05131J

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