Abstrakt
Adsorption of As(III) to aquifer sediments from the Red River
floodplain, Vietnam, has been studied with the aim of identifying
controlling parameters for the adsorption. The adsorption capacity
differs between similar sediments, indicating that it is not related to
bulk components of the sediment but rather that certain properties of
the sediments are important for the adsorption. Normalizing the
adsorption of As(III) to the content of Fe-oxides in the sediments
results in almost identical adsorption isotherms, indicating that
Fe-oxides are the main adsorbents for As(III) in these three reduced
aquifer sediments. This is further strengthened by adsorption
experiments carried out with sediments leached for Fe-oxides, as this
resulted in reduced adsorption capacity and despite the difference in
adsorption capacity of the untreated sediments, the adsorption capacity
became identical after Fe-oxide leaching. The importance of Fe-oxides
for As(III) adsorption to reduced aquifer sediments has implications for
the mobility of As(III) in the groundwater aquifers, as it will vary
spatially and also over time, as the Fe-oxides in the sediment are
reduced.
Originalsprog | Engelsk |
---|---|
Sider (fra-til) | 300-303 |
Antal sider | 4 |
Tidsskrift | Procedia Earth and Planetary Science |
Vol/bind | 17 |
DOI | |
Status | Udgivet - 2017 |
Begivenhed | Water-Rock Interaction International Symposium, WRI-15 - Evora, Portugal Varighed: 16 okt. 2016 → 21 okt. 2016 |
Programområde
- Programområde 2: Vandressourcer