Correlation between iron mobilization and emergence of benzene in leachate at old landfills

► Iron and benzene levels in leachate had similar patterns. ► Concentrations (mg/L) in leachate can be affected by rainwater infiltration. ► Correlations should be based on quantity (kg/d) not concentration (mg/L). ► Correlation between benzene and iron quantities in leachate was significant. ► Correlation between biocarbonate and iron quantities in leachate was significant.