Physics
Scientific paper
Jul 1955
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1955natur.176...81s&link_type=abstract
Nature, Volume 176, Issue 4471, pp. 81 (1955).
Physics
Scientific paper
THE recent communication by L. H. Bryant1 on an adsorbent-coated glass technique for circular chromatography of terpenes, etc., was read with interest. A rather similar method was developed in this laboratory in 1948, and various adsorbents were tried; pulverized silica gel appeared to cause some alteration (darkening) in certain of the mineral hydraulic oils tested, so its use was discontinued and ordinary fuller's earth (B.P. grade) used instead. This material (prepared as a trichlorethylene slurry poured on the glass to form a pool and then rapidly poured off to leave a thin film, which is allowed to dry in air) has proved consistently satisfactory. Spot tests made with it provide a convenient means of checking the consistency of different batches of mineral oils by examining the fluorescence of the rings containing the various oil constituents, using ultra-violet light from a mercury in quartz lamp fitted with a Wood's glass filter.
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