Planar optical chemical sensing and imaging of heterogeneous pH and oxygen fronts during reactive transport in porous media: Applications to acid mine drainage neutralization and zero-valent iron permeable reactive barrier treatment. - Li B; Seliman AF; Ghorbani M; Ganjalikhan Hakemi F; Ranjbar Z; Liang WZ; Xiao R; Sams A; Darnault CJG (Journal of contaminant hydrology, 2026)