Diaminobenzene as a Novel Reagent for Nitrite Assay in Environmental Samples: Evidence for Its Mechanistic Aspects
o-Phenylenediamine has been used as a reagent to quantify nitrites/nitrates in a variety of sample matrices. The method is based on the cyclization reaction between o-phenylenediamine and nitrite in acid medium. The amine undergoes diazotization with nitrite in the presence of acid to form the diazo...
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Published in | Analytical letters Vol. 41; no. 18; pp. 3342 - 3363 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Philadelphia, PA
Taylor & Francis Group
01.12.2008
Taylor & Francis |
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Abstract | o-Phenylenediamine has been used as a reagent to quantify nitrites/nitrates in a variety of sample matrices. The method is based on the cyclization reaction between o-phenylenediamine and nitrite in acid medium. The amine undergoes diazotization with nitrite in the presence of acid to form the diazonium ion, which subsequently cyclizes to yield yellowish orange benzotriazole at room temperature with an absorption maximum at 450 nm. The formed dye has been separated, purified, and characterized by IR, NMR, and spectroscopy techniques. The parameters of the reaction between amine and nitrite have been optimized. The effect of interfering ions on the determination of nitrites/nitrates has been described. The developed method has been applied for the determination of residual NO
2
gas present in the ambient air after fixing it as a nitrite ion using sodium arsenite as a trapping medium. The dye formed has been extracted into organic solvent to improve the detection limit during the measurement of low levels of ambient NO
2
in air. The method obeyed Beer's law in the concentration range 0-250 µg in aqueous medium and 0-50 µg in organic medium with molar absorptivity of 4.09 × 10
4
L mol
−1
cm
−1
and 4.3 × 10
4
L mol
−1
cm
−1
respectively. Nitrate is determined by reducing it to nitrite after passing through the copperized cadmium reductor column. The developed method has been applied to determine nitrite/nitrate levels in water, soil, and biological samples. |
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AbstractList | o-Phenylenediamine has been used as a reagent to quantify nitrites/nitrates in a variety of sample matrices. The method is based on the cyclization reaction between o-phenylenediamine and nitrite in acid medium. The amine undergoes diazotization with nitrite in the presence of acid to form the diazonium ion, which subsequently cyclizes to yield yellowish orange benzotriazole at room temperature with an absorption maximum at 450 nm. The formed dye has been separated, purified, and characterized by IR, NMR, and spectroscopy techniques. The parameters of the reaction between amine and nitrite have been optimized. The effect of interfering ions on the determination of nitrites/nitrates has been described. The developed method has been applied for the determination of residual NO2 gas present in the ambient air after fixing it as a nitrite ion using sodium arsenite as a trapping medium. The dye formed has been extracted into organic solvent to improve the detection limit during the measurement of low levels of ambient NO2 in air. The method obeyed Beer's law in the concentration range 0-250 kg in aqueous medium and 0-50 kg in organic medium with molar absorptivity of 4.09 t 104 L mol-1 cm-1 and 4.3 t 104 L mol-1 cm-1 respectively. Nitrate is determined by reducing it to nitrite after passing through the copperized cadmium reductor column. The developed method has been applied to determine nitrite/nitrate levels in water, soil, and biological samples. o-Phenylenediamine has been used as a reagent to quantify nitrites/nitrates in a variety of sample matrices. The method is based on the cyclization reaction between o-phenylenediamine and nitrite in acid medium. The amine undergoes diazotization with nitrite in the presence of acid to form the diazonium ion, which subsequently cyclizes to yield yellowish orange benzotriazole at room temperature with an absorption maximum at 450nm. The formed dye has been separated, purified, and characterized by IR, NMR, and spectroscopy techniques. The parameters of the reaction between amine and nitrite have been optimized. The effect of interfering ions on the determination of nitrites/nitrates has been described. The developed method has been applied for the determination of residual NO2 gas present in the ambient air after fixing it as a nitrite ion using sodium arsenite as a trapping medium. The dye formed has been extracted into organic solvent to improve the detection limit during the measurement of low levels of ambient NO2 in air. The method obeyed Beer's law in the concentration range 0-250mug in aqueous medium and 0-50mug in organic medium with molar absorptivity of 4.09t104Lmol-1cm-1 and 4.3t104Lmol-1cm-1 respectively. Nitrate is determined by reducing it to nitrite after passing through the copperized cadmium reductor column. The developed method has been applied to determine nitrite/nitrate levels in water, soil, and biological samples. o-Phenylenediamine has been used as a reagent to quantify nitrites/nitrates in a variety of sample matrices. The method is based on the cyclization reaction between o-phenylenediamine and nitrite in acid medium. The amine undergoes diazotization with nitrite in the presence of acid to form the diazonium ion, which subsequently cyclizes to yield yellowish orange benzotriazole at room temperature with an absorption maximum at 450 nm. The formed dye has been separated, purified, and characterized by IR, NMR, and spectroscopy techniques. The parameters of the reaction between amine and nitrite have been optimized. The effect of interfering ions on the determination of nitrites/nitrates has been described. The developed method has been applied for the determination of residual NO 2 gas present in the ambient air after fixing it as a nitrite ion using sodium arsenite as a trapping medium. The dye formed has been extracted into organic solvent to improve the detection limit during the measurement of low levels of ambient NO 2 in air. The method obeyed Beer's law in the concentration range 0-250 µg in aqueous medium and 0-50 µg in organic medium with molar absorptivity of 4.09 × 10 4 L mol −1 cm −1 and 4.3 × 10 4 L mol −1 cm −1 respectively. Nitrate is determined by reducing it to nitrite after passing through the copperized cadmium reductor column. The developed method has been applied to determine nitrite/nitrate levels in water, soil, and biological samples. |
Author | Venkataramanappa, Y. Pandurangappa, M. |
Author_xml | – sequence: 1 givenname: M. surname: Pandurangappa fullname: Pandurangappa, M. email: mpranga@yahoo.com organization: Department of Studies in Chemistry , Bangalore University, Central College Campus – sequence: 2 givenname: Y. surname: Venkataramanappa fullname: Venkataramanappa, Y. organization: Department of Studies in Chemistry , Bangalore University, Central College Campus |
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Cites_doi | 10.1080/00032710701606382 10.1051/analusis:1999161 10.1016/j.talanta.2004.03.059 10.1021/tx990120o 10.1039/b100594o 10.1039/b513999f 10.1016/S0039-9140(03)00421-1 10.1007/BF01244966 10.1016/S0039-9140(97)00325-1 10.1039/an9962101393 10.1039/b104305f 10.1016/j.jinorgbio.2004.10.034 10.1039/b512217a 10.1021/ja037944j 10.1039/b106791p 10.2116/analsci.15.129 10.1039/b716174c |
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Keywords | Water sodium arsenite Chemical analysis Dyes Nitrites Nitrates NMR spectrometry nitrate Solvent extraction Chemical enrichment Amine Sample preparation Aqueous medium Detection limit Sodium ion reductor column Acid medium Cadmium Ambient nitrogen dioxide Interference Absorption coefficient o-phenylenediamine Air Arsenites Diazotization Infrared spectrometry Biological compound Soils Organic solvent Absorption spectrometry Trapping nitrite Cyclization Sodium Environment Nitrogen dioxide Spectrophotometry Benzotriazole Room temperature |
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Snippet | o-Phenylenediamine has been used as a reagent to quantify nitrites/nitrates in a variety of sample matrices. The method is based on the cyclization reaction... |
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SubjectTerms | Ambient nitrogen dioxide Amines Analytical chemistry Applied sciences Chemistry cyclization Dyes Exact sciences and technology Global environmental pollution Mathematical analysis nitrate Nitrates nitrite Nitrites Nitrogen dioxide o-phenylenediamine Pollution reductor column Sodium arsenite solvent extraction Spectrometric and optical methods spectrophotometry Trapping |
Title | Diaminobenzene as a Novel Reagent for Nitrite Assay in Environmental Samples: Evidence for Its Mechanistic Aspects |
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