Assessment of the hazard posed by metal forms in water and sediments

Małgorzata Wojtkowska , Jan Bogacki , Anna Witeska

Abstract

his study aimed to describe the prevalence heavy metals (Zn, Cu, Pb, and Cd) forms in the ecosystem of the Utrata river in order to determine the mobile forms and bioavailability of metals. To extract the dissolved forms of metals in the water of the Utrata PHREEQC2 geochemical speciation model was used. The river waters show a high percentage of mobile and eco-toxic forms of Zn, Cu and Pb. The percentage of carbonate forms for all the studied metals was low (b 1%). The content of carbonates in the water and the prevailing physical and chemical conditions (pH, hardness, alkalinity) reduce the share of toxic metal forms, which precipitate as hardly soluble carbonate salts of Zn, Cu, Cd and Pb. Cu in the water in 90% of cases appeared in the form of hydroxyl compounds. To identify the forms of metal occurrence in the sediments Tessier's sequential extraction was used, allowing to assay bound metals in five fractions (ion exchange, carbonate, adsorption, organic, residual), whose nature and bioavailability varies in aquatic environments. The study has shown a large share of metals in labile and bioavailable forms. The speciation analysis revealed an absolute dominance of the organic fraction in the binding of Cu and Pb. Potent affinity for this fraction was also exhibited by Cd. The rations of exchangeable Zn and Cu forms in the sediments were similar. Both these metals had the lowest share in the most mobile ion exchange fraction
Author Małgorzata Wojtkowska ZIBJŚ
Małgorzata Wojtkowska,,
- Department of Informationa Science and Environment Quality Research
, Jan Bogacki ZIBJŚ
Jan Bogacki,,
- Department of Informationa Science and Environment Quality Research
, Anna Witeska ZIBJŚ
Anna Witeska,,
- Department of Informationa Science and Environment Quality Research
Journal seriesScience of the Total Environment, ISSN 0048-9697
Issue year2016
Vol551-552
Pages387-392
Publication size in sheets0.5
Keywords in EnglishHeavy metals; Water; Sediments; Pollution
DOIDOI:10.1016/j.scitotenv.2016.01.073
Languageen angielski
Score (nominal)40
ScoreMinisterial score = 40.0, 28-11-2017, ArticleFromJournal
Ministerial score (2013-2016) = 40.0, 28-11-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 4.9 (2) - 2016=5.102 (5)
Citation count*23 (2018-06-19)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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