The metabolic movements of zirconium in the animal body apparently have not been studied directly. Its presence in the blood and tissues indicates that it is absorbed from ordinary diets, while its virtual absence from the urine suggests that it is excreted by the intestine. Bone apparently accumulates the greatest amount of intraperitoneally injected zirconium. More detailed and direct evidence of the sites of absorption, retention, and excretion of zirconium is clearly desirable.
Found in igneous rocks at 165 ppm; shales at 160 ppm; sandstone at 220 ppm; limestone at 19 ppm; fresh water at 0.0026; sea water at 0.000022 ppm; soils at 300 ppm; marine plants at 20 ppm; land plants at 0.64 ppm; marine animals at 0.1 to 1 ppm; and land animals at 0.3 ppm.
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