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ISR of six materials with varying surface reactivities. The ISR of the six study materials are represented, with the cell viability for each in the inset. (a) Glass, (b) anatase, (c) San Joaquin Valley soil, (d) Montana soil, (e) untreated pyrite, and (f) acid treated pyrite. For some data points, the error bars are hidden by the symbols. * See Additional files 1 and Additional file 2 for clarification.
