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- W4239307500 startingPage "1189" @default.
- W4239307500 abstract "Potassium permanganate was replaced by potassium dichromate in our previously proposed method for colorimetric determination of methanol with chromotropic acid. The est ablished procedure is as follows. To 1.0 ml of the test solution containing 1.5∼30, μg of methanol, add 0.2 ml of a 0.2 w/v% 1-aminoethanol solution, O.2 ml of 1: 1 sulfuric acid, and 0.1 ml of a 1.0% potassium dichromate solution. Allow the mixture to stand at room temperature for 40 min. Add O.1 ml of a 20% sodium sulfite solution to reduce the excess of the dichromate and a 0.2 ml of 2% aqueous chromotropic acid solution. Add slowly 4 ml of 75%sulfuric acid. Heat the mixture in a boiling water bath for 10 min. Upon cooling to room temperature, measure the absorbance at 575 nm against the reagent blank.The sensitivity for detection was about 29 times higer than that in the absence of 1-amino ethanol, and the detection limit for methanol was 1.5, μg/ml, the molar extinction coefficient being 5.01 × 103 mol-1 ⋅ cm-1 ⋅dm3. The improved sensitization is most plausibly originated from the acceleration effect of the added 1-aminoethanol on the oxidation of methanol to formaldehyde in a potassium dichromate-sulfuric acid solution." @default.
- W4239307500 created "2022-05-12" @default.
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- W4239307500 date "1981-01-01" @default.
- W4239307500 modified "2023-10-17" @default.
- W4239307500 doi "https://doi.org/10.1246/nikkashi.1981.1189" @default.
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