Tarafder pranab kumar (9 résultats)

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Taschenbuch. Etat : Neu. Spectrophotometric Method for the Determination of Nitrite and Nitrate | Pranab Kumar Tarafder | Taschenbuch | 52 S. | Englisch | 2018 | Scholars' Press | EAN 9786202319461 | Verantwortliche Person für die EU: preigu GmbH & Co. KG, Lengericher Landstr. 19, 49078 Osnabrück, mail[at]preigu[dot]de | Anbieter: preigu. …

Taschenbuch. Etat : Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -The diazotisable amine, p-aminoacetophenone has been diazotized with nitrite in the presence of hydrochloric acid at room temperature, and the diazotized salt thus produced has been allowed to couple with the reagent, 2,3-dihydroxynaphthalene in alkaline medium to produce a reddish orange azo-dye suitable for the determination of nitrite at ppm level. The max of the azo-dye being 475 nm. The very azo-dye is extractable into an organic solvent like ethylacetate without shifting the max. Similarly, nitrate ion forms a strong reddish-yellow nitro product with 2,3 dihydroxynaphthalene in the presence of concentrated sulfuric acid. This nitro product is extractable into ethylacetate, and its absorbance is measured at 380nm ( max ).The Beer s law for nitrite and nitrate were obeyed in the range, 0.1 to 5.0 ppm and 0.2 to 25 ppm, respectively. The molar absorptivity of nitrite and nitrate methods are 2.5 104 and 3.2 103 L.mol-1cm-1 respectively. The RSD for both the methods are in the range, 0.5 to 2.5%. 52 pp. Englisch.…

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Taschenbuch. Etat : Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - The diazotisable amine, p-aminoacetophenone has been diazotized with nitrite in the presence of hydrochloric acid at room temperature, and the diazotized salt thus produced has been allowed to couple with the reagent, 2,3-dihydroxynaphthalene in alkaline medium to produce a reddish orange azo-dye suitable for the determination of nitrite at ppm level. The max of the azo-dye being 475 nm. The very azo-dye is extractable into an organic solvent like ethylacetate without shifting the max. Similarly, nitrate ion forms a strong reddish-yellow nitro product with 2,3 dihydroxynaphthalene in the presence of concentrated sulfuric acid. This nitro product is extractable into ethylacetate, and its absorbance is measured at 380nm ( max ).The Beer s law for nitrite and nitrate were obeyed in the range, 0.1 to 5.0 ppm and 0.2 to 25 ppm, respectively. The molar absorptivity of nitrite and nitrate methods are 2.5 104 and 3.2 103 L.mol-1cm-1 respectively. The RSD for both the methods are in the range, 0.5 to 2.5%.…

Kartoniert / Broschiert. Etat : New. Dieser Artikel ist ein Print on Demand Artikel und wird nach Ihrer Bestellung fuer Sie gedruckt. Autor/Autorin: Tarafder Pranab KumarWorked as a Senior Scientist in AMD,Deptt. of Atomic Energy,Govt. of India for 33 years. Organised a state-of-the-art Chemical laboratory at Jamshedpur India. Published more than 100 papers. Guided Ph.D and M.Sc.…

Taschenbuch. Etat : Neu. This item is printed on demand - Print on Demand Titel. Neuware -The diazotisable amine, p-aminoacetophenone has been diazotized with nitrite in the presence of hydrochloric acid at room temperature, and the diazotized salt thus produced has been allowed to couple with the reagent, 2,3-dihydroxynaphthalene in alkaline medium to produce a reddish orange azo-dye suitable for the determination of nitrite at ppm level. The ¿max of the azo-dye being 475 nm. The very azo-dye is extractable into an organic solvent like ethylacetate without shifting the ¿max. Similarly, nitrate ion forms a strong reddish-yellow nitro product with 2,3 dihydroxynaphthalene in the presence of concentrated sulfuric acid. This nitro product is extractable into ethylacetate, and its absorbance is measured at 380nm ( ¿max ).The Beer¿s law for nitrite and nitrate were obeyed in the range, 0.1 to 5.0 ppm and 0.2 to 25 ppm, respectively. The molar absorptivity of nitrite and nitrate methods are 2.5¿104 and 3.2¿103 L.mol-1cm-1 respectively. The RSD for both the methods are in the range, 0.5 to 2.5%.VDM Verlag, Dudweiler Landstraße 99, 66123 Saarbrücken 52 pp. Englisch.…