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Table 1. (continued) <br />Material and units <br />(in parentheses) <br />Concentrationa <br />Referenceb <br />Thermal waters, worldwide (20-3,800) <br />Max. 276,000 <br />RAIN (ug/l) <br />Canada (0.01-5) <br />Rhode Island 0.8 <br />Seattle, Washington 17 <br />RIVER WATER (ug/1) <br />Polluted, USA Max. 6,000 <br />Nonpolluted, USA Usually <5 <br />Nationwide, USA, 1974- <br />1981 <br />25th percentile <1 <br />50th percentile 1 <br />75th percentile 3 <br />ROCK (mg/kg) <br />Limestones 1.7 (0.1-20) <br />Sandstones 2 (0.6-120) <br />Shales and clays 14.5 (0.3-490) <br />Phosphates 22.6 (0.4-188) <br />Igneous, various 1.5-3 (0.06-113) <br />SEAWATER (ug/1) <br />Worldwide 2 (0.15-6) <br />Pacific Ocean (1.4-1.8) <br />Atlantic Ocean (1.0-1.5) <br />South Australia <br />ToW dissolved As 1.3 (1.1-1.6) <br />As <br />+3 <br />A 1.29 <br />s 0.03 <br />Particulate As <0.0006 <br />1,2,3,9 <br />1 <br />1 <br />4 <br />4 <br />10 <br />10 <br />10 <br />1 <br />1 <br />1 <br />1 <br />1 <br />6 <br />11 <br />11 <br />12 <br />12 <br />12 <br />12 <br />17