Studies on the Modification of Some Natural Zeolite From Romania After Acid and Basic Treatments

Cadar, Oana; Dinca, Zamfira; Șenilă, Marin; Becze, Anca; Todor, Florin

doi:10.5593/sgem2020/1.1/s01.039

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“…For the metals analysis, the zeolite samples were digested with a mixture of HNO 3 65%: HCl 37%: HF 40% (3:9:2, v : v ) in a closed-vessel Speedwave Xpert microwave system (Berghof, Eningen, Germany) using the method described previously [ 26 , 27 ]. The soil sample was digested in aqua regia (HCl 37%: HNO 3 65%, 3:1, v : v ), filtered and diluted to 100 mL with ultra-pure water [ 28 ].…”

Section: Methodsmentioning

confidence: 99%

Immobilization of Potentially Toxic Elements in Contaminated Soils Using Thermally Treated Natural Zeolite

et al. 2021

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Rehabilitation of contaminated soils is a complex and time-consuming procedure. One of the most cost-effective and easy-to-use soil remediation approaches is the use of amendments that stabilize the potential toxic elements (PTE) in soil by reducing their mobility and bioavailability. The stabilization of Cu, Pb, Zn, Cd, Co, Cr, Ni in a contaminated soil using 5% and 10% amendment with thermally treated natural zeolite was investigated using a sequential extraction procedure, contamination and environmental risk factors. The results showed that after amendment, the PTE concentration decreased in the exchangeable and reducible fractions and increased in the oxidizable and residual fractions. The highest immobilization effect, consisting in the decrease of exchangeable fractions with 69% was obtained in case of 10% zeolite amendment and 90 days of equilibration time for Pb; also, more than half of the mobile fraction was immobilized in case of Zn, Cu, and Co and about one third in case of Ni, Cr, and Cd. Generally, the immobilization effect of the 5% and 10% amendment is comparable, but a higher equilibration time enhanced the immobilization effect, especially in the case of Cd, Co, Cu, Pb, and Zn.

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Section: Methodsmentioning

confidence: 99%