Phytoextraction of Cr(VI)-Contaminated Soil by Phyllostachys pubescens: A Case Study

Abstract

This work presents the results of experimental tests to evaluate the effects of prolonged contamination by Cr on Moso Bamboo (MB) (Phyllostachys pubescens) and the adaptability of the MB to the Mediterranean climate. A preliminary test on the MB was developed in the laboratory, simulating irrigation under Mediterranean conditions (600 mm per year) and tropical conditions (1800 mm per year), to evaluate the rate of growth and the MB’s capability for Cr phytoextraction from contaminated soil. The tolerance of MB to Cr was also performed showing a good response of the plant to 100 mg Cr/L solution, utilized for irrigation of the pots. The results show that the rate of MB’s removal of Cr from soil ranged from 49.2% to 61.7% as a function of the soil degree of contamination, which varied from approx. 100 mg/kg to 300 mg/kg. The distribution of Cr in the various sections of the bamboo revealed that the greater percentage was present in rhizomes: 42%, equal to 114 mg Cr for 600 mm per year, and 50%, equal to 412 mg Cr for 1800 mm per year. A noteworthy diffusion of the metal towards the outermost parts of the plant was shown. The values of Cr retained in the stems and leaves of MB tissues were quite high and varied from 1100 mg/kg to 1700 mg/kg dry weight.

Mine Site Restoration: The Phytoremediation of Arsenic-Contaminated Soils

“…The successful application of phytoextraction in contaminated soils has been reported. For example, Ranieri et al [80] showed that Cr-contaminated soil was remediated with removal rates ranging from 49.2% to 61.7% through phytoextraction using Phyllostachys pubescens. Another study by Yu et al [81] showed that Bidens Pilosa L. and Xanthium strumarium L. presented the highest phytoextraction capacity for various metal(loid)s (Pb, Cd, Cn) in contaminated soils.…”

Phytoremediation of chromium, iron and nickel by Indian Rice Plant (Oryza sativa L.): An opportunity for management of multi-metal contaminated tannery wastewaterPhytoremediation of chromium, iron and nickel by Indian Rice Plant (Oryza sativa L.): An opportunity for management of multi-metal contaminated tannery wastewater

“…A crushed form of dry plant matter was ashed in a muffle furnace at 500 °C for 6 hours. Now, 1 gm of ash from all the samples were digested separately in a 100 mL beaker with a digestion mixture (nitric acid and perchloric acid 5:1 ratio) until white fume comes (Singh et al 2015;Ranieri et al 2021). Washed down the wall of a beaker with a minimal amount of distilled water and then filtered.…”