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In pleural effusions and sera from 66 patients copper and zinc were quantified by inductively coupled argon plasma-mass spectrometry after mineralizations in a closed-pressurized microwave unit with a mixture of concentrated nitric acid and 30% hydrogen peroxide. Total protein, pH, leukocyte count, lactate dehydrogenase, glucose, C-reactive protein, ceruloplasmin, and α1-antitrypsin were determined...
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