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COLORIMETRIC DETERMINATION OF TRACE METALS IN BEER AND IN BREWING MATERIALS
Author(s) -
Andrews J.,
Lloyd R. O. V.
Publication year - 1951
Publication title -
journal of the institute of brewing
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.523
H-Index - 51
eISSN - 2050-0416
pISSN - 0046-9750
DOI - 10.1002/j.2050-0416.1951.tb01636.x
Subject(s) - zinc , colorimetry , brewing , reagent , chemistry , chromatography , extraction (chemistry) , nuclear chemistry , organic chemistry , fermentation
Zinc Is determined colorimetrically in beer and brewing materials by means of di‐beta‐naphthylthiocarbazone. This reagent forms a complex with zinc which is soluble in carbon tetrachloride giving a cherry‐red solution. The zinc is determined by the mixed colour method of colorimetry, using a light filter with maximum transmission at 5,500 A. Interfering metals are removed by a preliminary extraction as diethyl‐dithiocarbamates. The range covered by the method is from 0 to 16 μgrn. of zinc, enabling determinations to be made of as little as 0.01 p.p.m. of zinc in liquids or 0.05 p.p.m. in solids.