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Spectrophotometric determination of nitrite by the formation of bisazo dye
Nagasundaram Gayathri
Published in
2001
Volume: 40
   
Issue: 6
Pages: 656 - 658
Abstract
A sensitive spectrophotometric method for the determination of nitrogen dioxide in air, nitrate and nitrite in water, soil, radiator coolant and some analytical grade chemicals is described. The method is based on diazo coupling reaction, where 4-amino azobenzene is treated with nitrite under acidic condition in the presence of bromide ion and the formed diazonium salt couples with resorcinol in acid medium. The formed bisazo dye has an absorption maxima at 550 nm under alkaline condition and obeys Beer's law over the range 0-16 μg of nitrite in overall aqueous volume of 25 mL. The system obeys Beer's law over the range 0-3 μg nitrite, when extracted into toluene under ammoniacal condition (pH 9.0±0.5) and stripped to aqueous phase with 5 mL of 0.35 molar NaOH. The molar absorptivity of the colour system is 4.8 × 104 L. mol-1. cm.1.
About the journal
JournalIndian Journal of Chemistry - Section A Inorganic, Physical, Theoretical and Analytical Chemistry
ISSN03764710
Open AccessNo
Concepts (22)
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    4 AMINOAZOBENZENE
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    Azo dye
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    BROMIDE
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    Diazonium compound
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    Nitrate
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    Nitrite
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    Nitrogen dioxide
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    Resorcinol
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    Sodium hydroxide
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    Toluene
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    Acidity
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    Air analysis
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    Alkalinity
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    Aqueous solution
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    Article
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    Chemical analysis
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    Chemical reaction
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    Extraction
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    Radiation
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    Soil
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    Spectrophotometry
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    Water analysis