ASSESSMENT OF SOIL CONTAMINATION WITH LEAD NEAR A FORMER LEAD SMELTER
Lead (Pb) is a persistent contaminant of the environment and under certain conditions, presents high toxicity and high bioaccumulation potential. The soil contamination near a former Pb smelter from Baia-Mare area (Romania) was assessed by determination of total content and mobilizable fractions of Pb, according to ISO 11466:1995 and modified European Community Bureau of References (BCR) Sequential Extraction Procedure (SEP), respectively. The BCR procedure simulates some of the environmental changes that can influence the metals mobility in soil and distinguishes between the exchangeable, reducible, oxidizable and residual fractions. The results showed that total Pb content ranged between 300-25000 mg/kg and exceeded the alert thresholds (250 mg/kg) in all samples, while in 68% of the analysed samples, exceeded the intervention threshold (1000 mg/kg) for less sensitive use, set by the Romanian legislation. About 24% of the total Pb content was acid soluble and could be released into the environment if conditions would become more acidic, 48% was bound to Fe and Mn oxides and hydroxides and could be mobilized in reducing conditions, while 17% was bound to organic matter and sulphides and could be mobilized in oxidizing conditions. Around 11% of the total Pb content was found in residual form and does not represent potential threat to the environment.
Keywords: soil contamination, BCR sequential extraction procedure, Pb mobility in soil
Maria Lucia, Bizo ( presenting )
Erika-Andrea , Levei
Oana Cristina, Modoi
Alexandru , Ozunu
Contribution proposed for: poster presentation