Aided phytoextraction of Cu, Pb, Zn, and As in copper-contaminated soils with tobacco and sunflower in crop rotation: Mobility and phytoavailability assessment

Abstract

Copper-contaminated soils were managed with aided phytoextraction in 31 field plots at a former wood preservation site, using a single incorporation of compost (OM) and dolomitic limestone (DL) followed by a crop rotation with tobacco and sunflower. Six amended plots, with increasing total soil Cu, and one unamended plot were selected together with a control uncontaminated plot. The mobility and phytoavailability of Cu, Zn, Cr and As were investigated after 2 and 3 years in soil samples collected in these eight plots. Total Cu, Zn, Cr and As concentrations were determined in the soil pore water (SPW) and available soil Cu and Zn fractions by DGT. The Cu, Zn, Cr and As phytoavailability was characterized by growing dwarf beans on potted soils and determining the biomass of their plant parts and their foliar ionome. Total Cu concentrations in the SPW increased with total soil Cu. Total Cu, Zn, Cr and As concentrations in the SPW decreased in year 3 as compared to year 2, likely due to annual shoot removals by the plants and the lixiviation. Available soil Cu and Zn fractions also declined in year 3. The Cu, Zn, Cr and As phytoavailability, assessed by their concentration and mineral mass in the primary leaves of beans, was reduced in year 3.

Effects of biochar, ochre and manure amendments associated with a metallicolous ecotype of Agrostis capillaris on As and Pb stabilization of a former mine technosol

“…The evolution of SPW pH with time was assessed, revealing that in almost all conditions (except PM and PBM), SPW pH decreased with time, between 0.6 and 0.8 units, and with no effect of plant growth. Such decreases with time have been observed previously (Hattab-Hambli et al 2016, Marseille et al 2000, and explained by the oxidation/acidification of the substrates due to watering. Non-amended Pontgibaud technosol presented a low EC at T0 (210 µS.cm -1 ), which increased following amendment application, except for with biochar alone (Table 3).…”

Effects of Pulp and Na-Bentonite Amendments on the Mobility of Trace Elements, Soil Enzymes Activity and Microbial Parameters under Ex Situ Aided Phytostabilization

“…On the other hand, they are not in full agreement with results reported by Cheng and Hseu [39] and Hattab-Hambli at al. [40], who did not observe changes in the soil pH after the application of inorganic zeolite, bentonite and dolomite into soil.…”

Influence of soil characteristics on the concentrations of Cr, Pb, and Zn in tobacco leaves from Longyan, China, and the associated predictive models

“…It underscored the necessity for adequate water treatment and appropriate remediation techniques to mitigate metal accumulation in crops. Additionally, Hattab-Hambli et al (2016) managed coppercontaminated soils through aided phytoextraction in field plots, implementing a crop rotation of tobacco and sunflower [71]. Their investigation into the mobility and phytoavailability of Cu, Zn, Cr, and Pb over two and three years revealed a decrease in total concentrations in the soil pore water, likely attributable to annual plant shoot removals and leaching.…”