Fig. 2
From: Transformation and fate of Fe(III) in petroleum-hydrocarbon-contaminated soil and groundwater
Relative proportions of Fe species present in groundwater colloids which were sampled at different distances from the point of injection of the remedial solution. a Groundwater colloids before injection of remedial solution (week-zero); b Groundwater colloids after 22.5 weeks of remedial solution injection. Species percentages were obtained from linear combination fitting (LCF) of Fe K-edge XANES. The blue bars, Fe(III)–OM, represent Fe(III)–organic matter coprecipitate