The 2,2′‐bipyridine effects on iron monosulfide (FeS) oxidative dissolution rates have been examined by potentiodynamic polarization and electrochemical impedance spectroscopy. The adsorption of 2,2′‐bipyridine to synthetic FeS was investigated by batch adsorption experiments, SEM, energy‐dispersive X‐ray analysis and Raman spectroscopy. The experiments were performed in air‐saturated solutions at pH 5, 25 °C and an ionic strength of I = 0.004 M NaCl. Correlation between oxidative dissolution rates and 2,2′‐bipyridine adsorption suggests that FeS oxidative dissolution is the result of two antagonistic processes: (i) the inhibiting adsorption of 2,2′‐bipyridine on mineral surface and (ii) the promoting effect of 2,2′‐bipyridine on the iron dissolution from FeS surface. Copyright © 2014 John Wiley & Sons, Ltd.

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