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Investigation of 3-amino-1,2,4-triazole azodye derivatives as reagents for determination of mercury(II)
Khedr, Abdalla M. Investigation of 3-amino-1,2,4-triazole azodye derivatives as reagents for determination of mercury(II) Chemical Papers, Vol.62, No. 6, 2008, 541-546
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Document type:
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Článok z časopisu / Journal Article |
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Collection:
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Chemical papers
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| Author(s) |
Khedr, Abdalla M.
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| Title |
Investigation of 3-amino-1,2,4-triazole azodye derivatives as reagents for determination of mercury(II)
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| Journal name |
Chemical Papers
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| Publication date |
2008
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| Year available |
2008
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| Volume number |
62
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| Issue number |
6
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| ISSN |
0366-6352
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| Start page |
541
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| End page |
546
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| Place of publication |
Poland
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| Publisher |
Versita
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| Collection year |
2008
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| Language |
english
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| Subject |
250000 Chemical Sciences
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| Abstract/Summary |
The reaction of mercury(II) with 3-(2,4-dihydroxyphen-1-ylazo)-1,2,4-triazole (HL1), 3-(2-hydroxy-5-methylphen-1-ylazo)-1,2,4-triazole (HL2), 3-(2-hydroxy-5-ethoxycarbonylphen-1-ylazo)-1,2,4-triazole (HL3), 3-(2-hydroxy-5-acetylphen-1-ylazo)-1,2,4-triazole (HL4), 3-(2-hydroxy-5-formylphen-1-ylazo)-1,2,4-triazole (HL5), and 3-(2-hydroxy-5-bromophen-1-ylazo)-1,2,4-triazole (HL6) was studied. A new, direct, and simple procedure was suggested for the spectrophotometric determination of mercury(II) based on its complexation reaction with HL1-HL6. The best reagent was found to be HL3 due to its high sensitivity and selectivity. In aqueous media of pH 9.0 containing 40 vol. % of methanol, Hg(II) reacts with HL3 to form a 1:2 (Hg(II) · HL3) complex having a sensitive absorption peak at 490 nm with the molar extinction coefficient of 3.31 × 104 L mol−1 cm−1 using 4 × 10−4 M of the reagent. Beer’s law is obeyed over the range from 0.00 µg mL−1 to 12.04 µg mL−1 of mercury(II). The proposed method was applied in the determination of mercury(II) in tap water, seawater and synthetic seawater samples, without the need of prior treatment, with satisfactory results.
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