Found in igneous rocks at 1.5 ppm; shale at 1.8 ppm; sandstone at 1.6 ppm; limestone at 0.6 ppm; sea water at 0.0001; soils at 1 ppm; marine plants at 0.035 ppm; marine animals at 0.0005 to 0.05 ppm; land animals at 0.005 ppm (accumulates in heart muscle and teeth at 0.00025 ppm). •
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