Using FLOWFFF and HPSEC to determine trace metal–colloid associations in wetland runoff

Autor(en)

Elisabeth Neubauer, Frank von der Kammer, Thilo Hofmann

Abstrakt

Natural organic matter (NOM) and iron colloids can coexist in surface water. These colloids might exhibit different affinities to metals and metalloids. Previously it has been shown, that organic and inorganic colloids in the low nanometer range can be fractionated using Flow Field-Flow Fractionation analyzes (FlowFFF), but it is not yet understood how the presence of inorganic colloids influences results obtained by High Performance Size Exclusion Chromatography (HPSEC). Studies that compare the use of these size-separation techniques for the analyzes of organic and inorganic colloids and associated elements are needed in order to interpret results obtained by either of these methods. Therefore, associations between colloids from a small stream draining a wetland area and a selected range of elements (Fe, Al, Ti, Pb, Cu, Ni, As, U, and Rare Earth Elements (REE)) have been investigated. FlowFFF analyzes and HPSEC analyzes were combined with ultrafiltration, functional group titration and arsenic speciation analysis.

 

NOM and, in a sample with a pH > 5.2, slightly larger iron organo-mineral colloids, were present in the

Organisation(en)

Journal

Water Research

Band

47

Seiten

2757-2769

Anzahl der Seiten

13

ISSN

0043-1354

Publikationsdatum

2013

Peer-reviewed

Ja

ÖFOS 2012

104002 Analytische Chemie, 104023 Umweltchemie, 105904 Umweltforschung

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/dd6806df-cdc3-4c05-8176-59734041104c