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- W2415695951 abstract "A sensitive spectrophotometric method for the determination of trace amounts of hydrogen sulphide after fixing it in triethanolamine-zinc acetate-sodium hydroxide absorbing solution is described. The method is based on the reaction of hydrogen sulphide with iodine to form iodide and after the extraction of unreacted iodine, the iodide was oxidised to iodate by bromine. After the removal of excess bromine, the generated iodate is utilised to oxidise hydroxylamine to nitrite which produces an azo dye in the presence of p-nitroaniline and N-(1-naphthyl)ethylenediamine dihydrochloride NEDA in acidic medium with maximum absorption at 545 nm. The colour system obeys Beer's law over the concentration range 0-3 I¼m of H2 S (n=10). The interference of common air pollutants like SO2, NO2 and HCHO were suitably overcome by the proper reaction conditions. The proposed method has been applied to the determination of low levels of H2S generated using permeation devices and residual hydrogen sulfide in a laboratory fume hood. Copyright © Enviromedia." @default.
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- W2415695951 date "2004-01-01" @default.
- W2415695951 modified "2023-09-27" @default.
- W2415695951 title "Chemical amplification method for the determination of hydrogen sulphide in air at trace level" @default.
- W2415695951 hasPublicationYear "2004" @default.
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