Talk:DU spectrophotometer

New article

 * - This is my newest article -- do you think it is something that might be suitable for GA? I plan to develop a series of articles about scientific instruments. Mary Mark Ockerbloom (talk) 01:14, 18 March 2016 (UTC)


 * i'm going to nominate for GA since the revscore is FA ores.wmflabs.org/scores/enwiki/wp10/710594564/. i would go for WP:DYK in the meantime. Duckduckstop (talk) 16:45, 18 March 2016 (UTC)


 * Since Duckduckstop has been blocked as a sockpuppet, I've converted the GA nomination over to Mary Mark Ockerbloom while retaining its seniority. BlueMoonset (talk) 15:28, 5 April 2016 (UTC)

Tecnical details
A single-beam instrument like this one has particular requirements as i) the light source intensity varies with wavelength. ii) the solvent may have an absorption spectrum. Both of these facts were handled by having two cuvettes, one conaining a sample, the other, called the blank, containing the solvent. At each wavelength two measurements are made with sample and with reference in the light beam. This enables the ratio, transmittance, to be obtained. For quantitative measurements transmittance is converted to absorbance which is proportional to the solute concentration according to Beer's law. This is of enormous significance as it makes possible the quantitative determination of the amount of a substance in solution given only that the substance absorbs light somewhere in the range covered by the spectrometer.

Incidentally, previous to the development of this type of instrument, quantitative analysis could be done with a photometer, using a selection of coloured optical filters for crude wavelength selection. Petergans (talk) 08:16, 30 March 2016 (UTC)


 * Hi Feel free to expand or modify; the "Design" section is currently pretty much a placeholder.  I'm hoping to have some supporting images and information from our digitization project, in a couple of months, to help expand it more intelligently. For now I don't have access to some of the information I'd like to use. Mary Mark Ockerbloom (talk) 17:45, 2 April 2016 (UTC)

DU
It took me quite some time to find out that DU is the model "number" this sghould be stated in the lead. --Stone (talk) 21:53, 30 March 2016 (UTC)
 * That should be clearer now. Mary Mark Ockerbloom (talk) 16:51, 5 April 2016 (UTC)

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