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→Health effects resulting from the deficiency and excessiveness of selenium
===Health effects resulting from the deficiency and excessiveness of selenium===
===Health effects resulting from the deficiency and excessiveness of selenium===
According to Fordyce,<ref name=Fordyce>Fordyce, F., 2010, Selenium deficiency and toxicity in the environment, ''in'' O. Selinus, B. Alloway, J. A. Centeno, J.A., Finkelman, R.B., Fuge, R., Lindh, U. and Smedley, P., (eds.) 2010. Essentials of Medical Geology. Elsevier, Amsterdam, 375-413.</ref> selenium is found in phosphatic rocks, coals, organic-rich shales and sulphide mineralization. It occurs in the soil in the form of selenites (Se4+), selenates (Se6+), selenides (Se2-) and elemental selenium (Se0).
According to Fordyce,<ref name=Fordyce>Fordyce, F., 2010, Selenium deficiency and toxicity in the environment, ''in'' O. Selinus, B. Alloway, J. A. Centeno, R. B. Finkelman, R. Fuge, U. Lindh, and P. Smedley, eds., 2010, Essentials of medical geology: Amsterdam, Elsevier, p. 375–413.</ref> selenium is found in phosphatic rocks, coals, organic-rich shales and sulphide mineralization. It occurs in the soil in the form of selenites (Se4+), selenates (Se6+), selenides (Se2-) and elemental selenium (Se0).
It can accumulate in the kidneys, liver, marrow, myocardium, pancreas, lungs, skin and hair. <ref name=Fordyce />
It can accumulate in the kidneys, liver, marrow, myocardium, pancreas, lungs, skin and hair. <ref name=Fordyce />