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Chemical and toxicological properties of coal fly ash - University of ...

Chemical and toxicological properties of coal fly ash - University of ...

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Table 25. The range <strong>of</strong> concentrations <strong>and</strong> recommended water quality levels for chemical constituents measuredin test solutions <strong>of</strong> 12.Range <strong>of</strong>Recommended water<strong>Chemical</strong> concentrations qua1 i ty 1 eve1 s r2constituent (mdL) a (m3/Ub Ch angec rcaAl 1 values in mg/L except pH.b~alues are MATES cited from Clel<strong>and</strong> <strong>and</strong> Kingsbury (1977) unless another source isindicated.cValues <strong>of</strong> r2 <strong>and</strong> r represent the results from multiple <strong>and</strong> simple 1 inearregression analyses <strong>of</strong> the relationship between mortality observed in the testsolutions <strong>of</strong> the extract <strong>and</strong> the concentrations <strong>of</strong> each chemical constituent measuredin those test solutions.d~rom Quality Criteria for Water 1976 (U.S. EPA, 1976).which the EC exceeded 4.0 mmhos/cm (Suloway et al., 1981). Thus, the totalionic strength <strong>of</strong> the test solutions <strong>of</strong> I7 also probably contributed to theacute toxicity <strong>of</strong> this <strong>fly</strong> <strong>ash</strong> extract.The extract generated from I2 was nearly neutral in pH when the LC-50determinations were made (Table 24). This extract was much less toxic thanwere the W2 <strong>and</strong> I3 extracts (Table 21); therefore, test solutions used todetermine the LC-50 value were comprised <strong>of</strong> 50 to 100% extract. Because <strong>of</strong>the high percentage <strong>of</strong> extract used in the test solutions, concentrations<strong>of</strong> various chemical constituents were higher in the test solutions <strong>of</strong> I2than in I3 <strong>and</strong> W2. The concentrations <strong>of</strong> B, Mn, Mo, Ni, SO4, <strong>and</strong> Zn intest solutions <strong>of</strong> I2 exceeded recommended water quality levels <strong>and</strong>correlated well with mortality data based on the simple linear regressions.

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