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<br />.' <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />2007 <br /> <br />with near neutral pH, based on pe-pH diagrams. All dissolved- iron concentrations were asswned to occur as Fe + 3 <br /> <br />based on the presence of large dissolved-oxygen concentrations during sample collection. Ferrihydrite (Fe(OHh) <br /> <br />was allowed to precipitate as a possible solid phase, based on initial modelling runs where ferrihydrite was deter- <br /> <br />mined to have a positive saturation index. Dissolved-metal concentrations less than the minimum reporting level <br /> <br />were assigned values of two-thirds the reporting level. Inorganic carbon was defined using laboratory alkalinity <br /> <br />concentrations. MlNTEQA2 does not account for organic substrates. Their impact was assumed to be negligible <br /> <br />for the study reach. because concentrations of organic carbon in the upper Arkansas River are relatively small (< <br /> <br />1 mglL to 17 mg/L) compared to inorganic carbon concentrations (23 mg/L to 170 mg/L). <br /> <br />8 <br />