title: Mercury and selenium content and chemical form in human and animal tissue.
abstract: The content, chemical form, and distribution of mercury and selenium were determined for selected samples of human and animal tissue by gas chromatography. Methylmercury averaged 38.7% of the total mercury content in homogenized human brain. For human heart, spleen, liver, kidney and placenta, methylmercury comprised 40.2%, 57.0%, 39.6%, 6.0% and 57.1% respectively, of the total mercury content. Similar results were obtained for the heart and liver of a whitetail deer. Methylmercury represented 9.1%, 62.9% and 24.1% of the total mercury content in seal liver, seal meat and deer meat, respectively. For all samples, a significant portion of the total selenium content, averaging 27%, was present as selenate (Se VI). Tissue selenium content did not correlate with the corresponding mercury content. In brain, heart and placenta, and in seal liver and meat, 53% to 80% of the total mercury content was water-extractable. For human kidney, liver and spleen, and deer meat, only 15% to 45% of the total mercury was extractable. On a percentage basis, inorganic mercury was more extractable than methylmercury, except for human kidney and liver, and deer meat. For all samples, except kidney, liver and deer meat, 55% to 76% of the total selenium content was water-extractable, Se VI being more extractable on a percentage basis than selenite (Se IV) and selenide (Se-II).
mesh_terms: D000328:Adult; D000818:Animals; D010872:Caniformia / Q000378:metabolism*; D055598:Chemical Phenomena; D002621:Chemistry; D003670:Deer / Q000378:metabolism*; D006801:Humans; D008628:Mercury / Q000032:analysis*; D009206:Myocardium / Q000032:analysis; D011506:Proteins / Q000032:analysis; D046048:Seals, Earless / Q000378:metabolism*; D012643:Selenium / Q000032:analysis*; D014018:Tissue Distribution
chemical_list: D011506:Proteins; D008628:Mercury; D012643:Selenium