Impact of various amendments on immobilization and phytoavailability of nickel and zinc in a contaminated floodplain soil

Abstract

The immobilization of toxic metals in soils using amendments is a cost-effective remediation technique for contaminated soils. Therefore, this study aimed to assess the efficiency of various amendments to immobilize nickel (Ni) and zinc (Zn) in soil and reduce their phytoavailability. A greenhouse pot experiment was established with a contaminated agricultural floodplain soil. The soil was treated with activated carbon (AC), bentonite (BE), biochar (BI), cement bypass kiln dust (CBD), chitosan (CH), coal fly ash (FA), limestone (LS), nano-hydroxyapatite (HA), organo-clay (OC), sugar beet factory lime (SBFL), and zeolite (Z) with an application rate of 1 % (0.2 % for HA) and cultivated by rapeseed (Brassica napus). After plant harvesting, the soil was analyzed for water-soluble and geochemical fractions of Ni and Zn. Additionally, both metals were analyzed in the aboveground biomass. Application of the amendments increased significantly the biomass production of rapeseed compared to the control (except for OC, HA, and FA). Water-soluble Ni and Zn decreased significantly after adding the amendments (except OC, Z, and CH). The SBFL, CBD, LS, BE, AC, and BI were most effective, resulting in a 58-99 and 56-96 % decrease in water-soluble Ni and Zn, respectively. The addition of SBFL, CBD, and LS leads to the highest decreasing rate of concentrations of Ni in plants (56-68 %) and Zn (40-49 %). The results demonstrate the high potential of CBD, SBFL, LS, BE, AC, and BI for the immobilization of Ni and Zn in contaminated floodplain soils.

Influence of Various Passivators for Nickel Immobilization in Contaminated Soil of China

“…These obtained findings also indicated that the application of calcite, RS, TSP, and ZE increased the reducible portion of Ni. It could be demonstrated that the incorporation of BI showed the formation of Fe-Mn oxides and bonds with the mineral phase of BI, which ultimately resulted in the formation of an insoluble stable complex form of metals (Shaheen et al, 2015). The oxidizable proportion of Ni was also significantly increased with the addition of 1% and 2% BI and recorded as 11.5% and 17%, respectively.…”

“…Therefore, the immobilization of Ni contaminated soil has become an important task to reduce its mobility within the soil. For this purpose, various remediation techniques have been performed, including physiochemical approaches and phytoextraction (Shaheen et al, 2015;Bashir et al, 2018a). Recently, the use of several organic and inorganic passivators has attained a considerable attention for the remediation of Ni contaminated soils (Shaheen et al, 2015;Radziemska and Mazur, 2016;Khan et al, 2017).…”

“…It is prepared from organic biomass through pyrolysis under the limited supply of oxygen (Khan et al, 2017;Shaaban et al, 2018a). BI has exclusive physical and chemical attributes such as high alkalinity, large specific surface area, high cation exchange, porosity, and more functional groups (Shen et al, 2017;Salam et al, 2018), which can play a vital role to immobilize the Ni in contaminated soils (Shaheen et al, 2015;Shen et al, 2017). In addition to this, BI showed significant potential to improve soil physiochemical properties, immobilize PTEs, and reduce their toxicity to plants when incorporated in contaminated soils (Ramzani et al,2016;El-Naggar et al, 2018).…”

Bentonite and Biochar Mitigate Pb Toxicity in Pisum sativum by Reducing Plant Oxidative Stress and Pb Translocation

“…Moreover, improvement in soil CEC after the application of BN is responsible for the reduced phytoavailability of Pb. It has been reported that improvement in plant biomass and associated parameters are mainly due to the alleviation of Pb toxicity to the plants [7,26].…”

Integrating EDDS-enhanced washing with low-cost stabilization of metal-contaminated soil from an e-waste recycling site

“…2c&d). Because amendments with biochar and CFA primarily served to stabilize the weakly bound metals in soil via adsorption, complexation and precipitation due to increase of soil pH and additional sorption capacity Shaheen et al, 2014), this study showed that preceding 2-h EDDS washing enabled removal of bioavailable metals and thus significantly reduced the resultant DTPA-and SBET-extractable metals. Yet, there was little difference between the stabilization effectiveness of the three amendments (i.e., individual or combined applications of biochar produced at different temperatures and CFA), as indicated by the same letters and overlapping error bars of the same metals in Figs.…”