Fig. 6 The attenuated total reflectance–Fourier transform infrared (ATR–FTIR) difference spectra of selenate and selenite in aqueous solution (spectrum of 0.1 M Na₂SeO₄ or 1.0 M Na₂SeO₃ in 1.0 M NaCl at pH 5.0 or 8.0 - spectrum of 1.0 M NaCl at pH 5.0 or 8.0). The subtraction factor was unity. The spectra are offset for clarity

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