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Iskalni niz: "ključne besede" (onesnaženje okolja) .

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Preparation and characterization of the sulfur-impregnated natural zeolite clinoptilolite for Hg(II) removal fromaqueous solutions
Ivona Nuić, Aleksandra Daković, Martin Gaberšek, Marin Ugrina, 2021

Povzetek: Sulfur-impregnated zeolite has been obtained from the natural zeolite clinoptilolite by chemical modification with Na2S at 150 °C. The purpose of zeolite impregnation was to enhance the sorption of Hg(II) from aqueous solutions. Chemical analysis, acid and basic properties determined by Bohem’s method, chemical behavior at different pHo values, zeta potential, cation-exchange capacity (CEC), specific surface area, X-ray powder diffraction (XRPD), scanning electron microscopy with energy-dispersive X-ray analysis (SEM-EDS), Fourier transform infrared spectroscopy (FTIR), as well as thermogravimetry with derivative thermogravimetry (TG-DTG) were used for detailed comparative mineralogical and physico-chemical characterization of natural and sulfur-impregnated zeolites.
Ključne besede: zeolit, klinoptilolit, živo srebro, onesnaženje okolja
DiRROS - Objavljeno: 03.03.2022; Ogledov: 139; Prenosov: 60
.pdf Celotno besedilo (6,88 MB)

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Distribution of Pb, Zn and Cd in stream and alluvial sediments in the area with past Zn smelting operations
Barbara Čeplak, Gorazd Žibret, 2021

Povzetek: The sources of Zn, Pb and Cd in alluvial and stream sediments have been studied in the area of historical Zn smelting tradition. 30 samples of stream sediments and samples from 4 alluvial sediment profiles were collected. Fractions 0.125–0.063 and < 0.063 mm were analysed by the means of ICP-MS prior 4-acid digestion. The highest levels of Zn, Cd and Pb were detected in the alluvial sediments in the closest vicinity to the abandoned slag and ore roasting residue waste dumps, reaching 96 and 4520 mg/kg, 522 and 26,800 mg/kg and 3.7 and 31 mg/kg for Pb, Zn and Cd in stream and alluvial sediments, respectively. The Voglajna River then transports contamination particles into the Savinja River, which afterwards flows into the Sava River. Consequently, the anomaly can even be detected in the Sava River, more than 30 km downstream. Higher levels of Pb, Zn and Cd have been found in fraction < 0.063 mm compared to 0.125–0.063 mm fraction. Impacts of historically contaminated soil erosion and in particular the wash-out of Zn-smelting waste from the improperly managed waste dump were recognised as the dominant sources of Zn, Cd and Pb in the stream and alluvial sediments.
Ključne besede: onesnaženje okolja, rečni sedimenti, porazdelitev elementov, topilništvo
DiRROS - Objavljeno: 03.03.2022; Ogledov: 141; Prenosov: 52
.pdf Celotno besedilo (1,76 MB)

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