Abstract
Chromium is the second most common metal pollutant in the soil, sediments and groundwater, due to its extensive industrial application, hence posing a serious environmental concern. Various remediation approaches including phytoremediation have been proposed to remediate chromium polluted waters and soils. In the present research, a total of sixty-one plant species belongs to thirty families were analyzed for the concentration of Chromium. Chromium was analyzed in the soil of the root zone, root and shoot of each plant. The concentration of chromium in the soil of different sites and plant parts (roots and shoots) was found in mg/kg in the range of 0.33–48.73, 8–1233.3 and 10.23–568.33 respectively. The highest concentration of chromium was found in the soil of site Site 41 (48.73 mg/kg) followed by Site 18 (47.83 mg/kg) and Site 6 (45.33 mg/kg). Among the analyzed plants, the highest concentration of chromium in mg/kg was found in the root of Cannabis sativa (1233.3) while its highest concentration was found in the shoot of Allium griffithianum (568.33). Phytoremediation potential of the analyzed plants was evaluated by the calculation of Bioconcentration Factor (BCF), Translocation Factor (TF) and Biological Accumulation Coefficient (BAC). Thirty-eight plant species showed feasibility for the phytostabilization of chromium (Cr_Excluders) based on BCF value and the concentration of chromium in the root. Plants i.e. Argyrolobium stenophyllum, Silybum marianum, Bryophyllum daigremontianum, Limonium macrorhabdon, Calendula arvensis and Delphinium suave were found the most efficient plant for the phytostabilization of chromium. Fifteen plant species showed feasibility for the phytoextraction of chromium (Cr_Indicators) based on TF value. The most efficient plant's species among them for the phytoextraction of chromium are Rosularia adenotricha, Catharanthus roseus, Allium griffithianum, Himalaiella heteromalla, Stellaria media, Salvia moorcroftiana and Marrubium vulgare. Based on BCFs, TFs and BACs value and the concentration of chromium in plant shoot six plant species Allium griffithianum, Catharanthus roseus, Himalaiella heteromalla, Geranium rotundifolium, Marrubium vulgare and Solanum nigrum were found chromium hyperaccumulators.
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