Chromium speciation in river sediment pore water contaminated by tannery effluent

► Cr speciation in sediment pore water contaminated by tannery effluent was studied. ► Dialysis cells, or peepers, were used to collect sediment pore water samples. ► ICP-MS and HPLC-ICP-MS were used to determine [Cr(total)], [Cr(III)], and [Cr(VI)]. ► Peepers are simple and have good reliability for consistent results. ► Results show an absence of Cr(VI) and strong reducing conditions at the study site.