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u <br />1 <br />rn <br />E <br />c <br />~ 0. <br />c <br />m <br />U <br />U 0.0 <br />0.00 <br />Elapsed Weeks of Test <br /> <br />-~-- pH --~ Iron --= Zinc <br />= Arsenic --~- Chromium ~- Thallium <br />Figure 20 <br />Metals Solubilization <br />COMP 9 Metals and pH <br />