Phytoremediation of lead-contaminated soil bySinapis arvensisandRapistrum rugosum

Abstract

Nowadays, public concern relating to ecological deleterious effects of heavy metals is on the rise. To evaluate the potential of Rapistrum rugosum and Sinapis arvensis in lead- contaminate phytoremediate, a pot culture experiment was conducted. The pots were filled by soil treated with different rates of leadoxide (PbO) including 0 (control), 100, 200, 300, 400, and 500 mg Pb per 1 kg soil. Germinated seeds were sown. Surprisingly, with increasing concentration of Pb, dry weight of R. rugosum and S. arvensis did not decrease significantly. In both of species, the concentration of Pb was higher in roots than shoots. In general, S.arvensis was absorbed more Pb compared to R. rugosum. The results revealed high potential of R. rugosum and S. arvensis in withdrawing Pb from contaminated soil. For both species, a positive linear relation was observed between Pb concentration in soil and roots. However, linear relationship was not observed between Pb concentration in the soil and shoots. Although both species test had low ability in translocation Pb from roots to shoots but they showed high ability in uptake soil Pb by roots. Apparently, these plants are proper species for using in phytoremediation technology.

Effect of zero-valent iron nanoparticles on the phytoextraction ability of Kochia scoparia and its response in Pb contaminated soil

“…Immobilization of anionic heavy metals (As and Cr) were greater in acidic soils, while retention of cationic heavy metals (Pb, Cd and Zn) were found to be higher in calcareous soil. Immobilization of Pb, As and Cr increased more than 82% through application of 10% of nZVI; however, nZVI could not significantly affect immobilization of Cd (only 13% to 42%), regardless of the soil pH [16,17].…”

“…1.5 g/kg Pb in plant tissue after four months [15]. In a study by Saghi et al [16], 100 to 500 mg/kg Pb were applied to soil, and it was found that growth parameters of R. rugosum and S. arvensis did not decrease significantly. In addition, higher accumulation of Pb in roots of the studied plant species was observed compared to shoots.…”

“…Obtained extract was then analyzed for metals concentrations using an atomic absorption spectrophotometry (Perkin Elmer 700) according to the standard methods. All the analytical determinations were carried out in triplicate and the mean values were reported [16].…”

“…It is also pretty simpler than some other nanomaterials to be prepared and the low cost makes it an attractive nanomaterial for remediation purposes. Moreover, nZVI has been reported to pose less toxicity for the plants [16,17,19]. Zero-valent iron nanoparticles were prepared using borohydride reduction method.…”

“…The use of nZVI as a feasible and prospective strategy to remediate heavy metals-polluted soils has been suggested by several researchers [16,17]. Immobilization of heavy metals in soil through applying nZVI has been found to be a principal mechanism by which remediation goals at metal-contaminated sites can be achieved.…”