Surface complexation model for strontium sorption to amorphous silica and goethite.

Geochemical Transactions
S A CarrollP A O'Day

Abstract

Strontium sorption to amorphous silica and goethite was measured as a function of pH and dissolved strontium and carbonate concentrations at 25 degrees C. Strontium sorption gradually increases from 0 to 100% from pH 6 to 10 for both phases and requires multiple outer-sphere surface complexes to fit the data. All data are modeled using the triple layer model and the site-occupancy standard state; unless stated otherwise all strontium complexes are mononuclear. Strontium sorption to amorphous silica in the presence and absence of dissolved carbonate can be fit with tetradentate Sr2+ and SrOH+ complexes on the beta-plane and a monodentate Sr2+complex on the diffuse plane to account for strontium sorption at low ionic strength. Strontium sorption to goethite in the absence of dissolved carbonate can be fit with monodentate and tetradentate SrOH+ complexes and a tetradentate binuclear Sr2+ species on the beta-plane. The binuclear complex is needed to account for enhanced sorption at hgh strontium surface loadings. In the presence of dissolved carbonate additional monodentate Sr2+ and SrOH+ carbonate surface complexes on the beta-plane are needed to fit strontium sorption to goethite. Modeling strontium sorption as outer-sphere comp...Continue Reading

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Citations

Mar 5, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Adam J FullerIan Terence Burke
Mar 14, 2017·Environmental Science & Technology·Zhe NieJohannes Lützenkirchen
Sep 25, 2019·Journal of Hazardous, Toxic and Radioactive Waste·Christopher OsterMatthew Magnuson
Jun 9, 2020·Journal of Environmental Management·Eleazer L VivasKuk Cho
Dec 3, 2013·Environmental Science & Technology·George ReddenHai Huang
Apr 23, 2013·Environmental Science & Technology·Tammie L GerkeJ Barry Maynard

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Methods Mentioned

BETA
atomic emission spectrometry
X-ray

Software Mentioned

EXAFSPAK
FEFF6
FITEQL
GEOSURF

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