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Fig. 2. Soluble selenium concentrations as a function of pH under different selenium addition conditions for 0.2 mol/L NaOH washed ash #1004: (a) Se(VI) and (b) Se(IV). Experimental conditions: S/L = 1:10; ionic strength = 0.01 mol/L NaNO₃; temperature = 20–25°C; equilibration time = 24 h.