title: Comparison of Pb, Zn, Cd, As, Cr, Mo and Sb adsorption onto natural surface coatings in a stream draining natural as geochemical anomaly.
abstract: Natural surface coatings (biofilms) were collected on glass slides in the shallow, arsenic-rich stream and were used to compare biofilm trace element adsorption properties. Biofilm element retention and affinities were element specific indicating different processes control their sequestration. Distribution coefficients (K d values), calculated as the ratio between biofilm and dissolved trace element concentrations, revealed solid phase enrichment that, depending on the trace element, extended from 10(0.18) to 10(3.17). Elements were specifically scavenged by the organic constituents of the biofilm itself (Fe, Pb, Zn, Cr) and associated biominerals of poorly ordered Mn oxide (Cd, As, Mo, Sb). The results provide an evidence for the significant role that microbial activity can play in trace element geochemistry in freshwater environment.
authors: Institute of Geology, Academy of Sciences of the Czech Republic, v.v.i., Rozvojová 269, 165 00, Prague 6, Lysolaje, Czech Republic, petr.drahota@natur.cuni.cz.
authors: Petr
authors: P
authors: Drahota
authors: Pavel
authors: P
authors: Skaloud
authors: Barbara
authors: B
authors: Nováková
authors: Martin
authors: M
authors: Mihaljevič
mesh_terms: D000327:Adsorption; D001151:Arsenic / Q000737:chemistry; D018441:Biofilms; D019216:Metals, Heavy / Q000737:chemistry*; D009930:Organic Chemicals / Q000737:chemistry; D010087:Oxides / Q000737:chemistry*; D045483:Rivers / Q000737:chemistry / Q000382:microbiology*; D014131:Trace Elements / Q000737:chemistry*
chemical_list: D019216:Metals, Heavy; D009930:Organic Chemicals; D010087:Oxides; D014131:Trace Elements; D001151:Arsenic