Abstract
This study aims to quantify hexavalent chromium in wastewater, plants and topsoil in Djelfa city (South of Algeria) in order to better understand the bioaccumulation and phytoremediation potential of eight spontaneous plant species growing in a polluted environment, namely Sisymbrium Irio, Spinacia oleracea, Avena Sativa, Silybum Eburneum, Euphorbia Bupleuroides, Thapsia Garganica, Hertia Cheirifolia and Marrubium Vulgare. Wastewater, soil and spontaneous plant samples were collected near Djelfa’s Oued Mellah valley. Spectrophotometric measurements of hexavalent chromium concentration were used to determine pollution levels and to assess the accumulation potential of studied spontaneous plants. The results showed that in wastewater, soil and plant samples, Cr(VI) concentrations near the tannery upstream were 0.6 mg/L, 44 mg/kg and 6.2 mg/kg respectively. The most significant bioaccumulation potential was recorded with Thapsia Garganica while the highest translocation factor (TF) was found in Marrubium Vulgare. These species could be considered as a promising phytoremediation solution for chromium-polluted soils. According to plant sample enrichment factor (EF), the roots of almost all tested plants were found to be more effective to accumulate Cr(VI) than shoots.
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