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Nature 161, 805-806 (22 May 1948) | doi:10.1038/161805a0;

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Reversion: a New Procedure in Absorptiometry

H. IRVING , G. ANDREW & E. J. RISDON

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In a systematic study of the estimation with dithizone of traces of mercury in? biological materials3, we have shown that in the absence of suitable masking reagents mercury cannot be extracted quantitatively, even under optimum conditions, without co-extraction of more or less copper.