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Analytical method for determing copper in edible shortenings and oils
Author(s) -
Deck Rudolph E.,
Kaiser Kay K.
Publication year - 1970
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02640401
Subject(s) - copper , reagent , chemistry , boiling , chromatography , relative standard deviation , organic chemistry , detection limit
A reliable, practical method was developed for the quantitative determination of sub‐ppm levels of copper in edible shortenings and oils. Copper is quantitatively extracted with a boiling solution of 0.01% EDTA in 25% HCl. The extract was analyzed with 2,9‐dimethyl‐4,7‐diphenyl‐1,10‐phenanthroline (Bathocuproine), a highly specific and exceptionally sensitive reagent for the colorimetric determination of copper. An average recovery of 99.8% was obtained on 22 samples containing added oil soluble copper standards. A standard deviation of 0.002 ppm was established at the 0.05 ppm level during routine application of this method to a variety of shortenings and oils.