Potential mobility of heavy metals through coupled application of sequential extraction and isotopic exchange: Comparison of leaching tests applied to soil and soakaway sediment

► Comparative study of heavy metal mobilization from soakaway sediment and soil. ► Integrated evaluation through fractionation, isotopic dilution and leaching test. ► Leaching tests showed gradual increase in isotopic exchangeability of metals. ► Rapid change in the free and labile complexes of metals except Pb. ► Intermittent flow condition seems to induce Cu retention but Zn & Pb leaching.