Abstract
Natural mercury levels in wheat appear to be 2–12 parts per billion (ppb). This interpretation was arrived at by analysis of 297 wheat samples grown during the 103-yr period from 1875 to 1977, and one very old Egyptian sample dating back to 1200 B.C. Contamination by extraneous mercury was found to have occurred in many of the museum-stored, as well as in the more recent samples of wheat. Mercury contamination is due to mercury transfer from laboratory atmospheres, materials commonly used to contain samples, laboratory containers, and storage conditions. Biological museum samples are most likely to be contaminated with extraneous mercury from contaminated cotton and mercurial fungicides.Key words: Mercury, wheat, mercury contamination, mercurial fungicides
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