Zur Colorimetrie des Furfurols |
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| Authors: | F Aeschlimann P O Bethge und J H Eggers |
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| Institution: | (1) Analytischen Laboratorium des Schwedischen Holzforschungsinstitutes, Stockholm;(2) Svenska Träforskningsinstitutet, Drottning Kristinas Väg 61, Stockholm Ö, Schweden |
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| Abstract: | Summary A review is given of the mechanism of the Stenhouse-reaction (SR) of arylamines with furfural and of its qualitative and quantitative analytical applications.A number of factors, which influence the use of the SR for the colorimetric determination of furfural in Tollens-distillates are discussed in the experimentical part. It was found, that the addition of stannous chloride not only stabilises the SR-colour but also catalyses the SR itself. The presence of aldehydes other than furfural in Tollensdistillates, primarily has a negative influence on the SR of furfural. Spectral overlapping by reaction products from these aldehydes is less important.Aniline, p-anisidine and p-bromaniline were found to be the most suitable of the arylamines studied. The SR with aniline is fairly sensitive and moderately susceptible to interference. The SR with p-anisidine is highly sensitive but more liable to interference. The SR with p-bromaniline has normal sensitivity and follows Beer's law more exactly; its use is, however, limited by the extreme negative influence of formaldehyde.
Herrn Dozenten B. Lindberg sind die Autoren für eine Diskussion der Arbeit zu Dank verpflichtet. |
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