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Table 1. (concluded) <br />Material and units <br />(in parentheses) <br />Concentrationa <br />Referenceb <br />Unmineralized areas <br />Arsenate (18-49) 17 <br />Arsenate (1-7) 17 <br />MMAA <1 17 <br />Total arsenic (13-59) 17 <br />SOILS (mg/kg dry weight) <br />USA, uncontaminated 7.4 18 <br />Worldwide, uncontaminated 7.2 18 <br />Canada <br />Near gold mine <br />3 <br />Air levels 3.9 ug As/m 21,213 3 <br />80 km distant (10-25) 3 <br />Near smelter <br />Japan Max. 2,470 2 <br />Tacoma, Washington Max. 380 2 <br />Treated with arsenical <br />pesticides <br />USA 165 (1-2,553) 6 <br />Canada 121 6 <br />SYNTHETIC DETERGENTS (mg/kg) <br />Household, heavy duty (1-73) 1,2 <br />a Concentrations are listed as mean, minimum-maximum (in parentheses), and <br />maximum (Max.). <br />bReferences: 1, NAS 1977; 2, Pershagen and Vahter 1979; 3, NRCC 1978; 4, EPA <br />1980; 5, Hood 1985; 6, Woolson 1975; 7, Freeman et al. 1986; 8, Sorensen et <br />al. 1985; 9, Farmer and Lovell 1986; 10, Smith et al. 1987; 11, Sanders 1980; <br />12, Maher 1985a; 13, Howard et al. 1984; 14, Hallacher et al. 1985; 15, <br />Takamatsu 1985; 16, Wiener et al. 1984; 17, Haswell et al. 1985; 18, Dudas <br />1984. <br />19