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A survey of copper content of butter in Western Australia

Authors: D.N. Tulloch


The copper content of butters made in the seven factories in Western Australia was determined two or three times a month for a year. Of a total of 230 samples, 20% had a copper content below 0.08 ppm. There was a seasonal variation in the copper content, the maximum levels corresponding to minimum production (February-April). The mean copper level from all factories ranged from 0.27 ppm in March to 0.10 ppm in October. It was shown that exposed copper surfaces on fittings in wooden churns as well as in pumps, cocks and pipelines played a significant part in increasing the level of copper in butter during manufacture.

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