Subcritical and supercritical fluid extraction of heavy metals from sand and sewage sludge
ERDAL YABALAK, AHMET MURAT GIZIR
Demetalization of Pb, Ni, Zn, Cu and Cr heavy metal ions from sea sand and real samples of sewage sludge by subcritical water and supercritical carbon dioxide was investigated. Experimental parameters such as temperature, pressure, extraction time in the static and dynamic mode and sampling were optimized in order to determine the suitable conditions for high removal of metals. The best extraction efficiencies were obtained using acetyl acetonate as a chelating agent in both subcritical water and supercritical CO2 extractions for real and artificial samples. Samples collected from extraction system using both subcritical water and supercritical carbon dioxide were analyzed by inductively coupled plasma mass spectrometry (ICP-MS). The highest recoveries obtained from real samples for Cr, Cu...
Distribution of heavy metals in surface sediments of a Coastal Lagoon (Akyatan Lagoon, Northeastern Mediterranean Sea): Ecological and potential health risk assessment
Özbay, Özgür | Akçay, İsmail | Alp, Mehmet Tahir
Coastal lagoons are highly enriched by heavy metals due to various natural and anthropogenic pressures. Sediment heavy metal pollution status and potential health risk assessment of the Akyatan Lagoon were determined from the seasonally obtained sediment samples between January 2022 and October 2022. The heavy metal concentrations in surface sediments of the Akyatan Lagoon ranged between 25.73 and 70.87 g/kg for Al, 10.28–31.03 mg/kg for Co, 0.11–1.42 mg/kg for Cd, 56.22–181.64 mg/kg for Cr, 10.06–34.16 mg/kg for Cu, 13.94–43.39 g/kg for Fe, 361.45–1118.82 mg/kg for Mn, 61.53–209.42 mg/kg for Ni, 9.46–34.43 mg/kg for Pb, and 19.57–117.42 mg/kg for Zn, respectively. The calculated ecological risk indices showed moderate Co, Cd, Cr, Ni, and Pb contamination for surface sediments of the Akyat...