Transport of malonate in a goethite–silica sand system

The mobility of weak organic acids is of great importance for the transport of heavy metals and other contaminants. This work discusses the breakthrough behavior of malonic acid through a column packed with goethite coated sand. The transport of malonic acid is dominated by multicomponent chemical i...

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Bibliographic Details
Published inColloids and surfaces. A, Physicochemical and engineering aspects Vol. 151; no. 1; pp. 245 - 253
Main Authors Filius, Jeroen D, Meeussen, Johannes C.L, van Riemsdijk, Willem H
Format Journal Article
LanguageEnglish
Published Elsevier B.V 15.06.1999
Subjects
Acidity
Adsorption
Goethite
Malonate
MUSIC model
Organic acid
Sectie Bodemkwaliteit
Sub-department of Soil Quality
Transport
Adsorption
Organic acid
Malonate
Acidity
MUSIC model
Transport
Goethite
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Summary:The mobility of weak organic acids is of great importance for the transport of heavy metals and other contaminants. This work discusses the breakthrough behavior of malonic acid through a column packed with goethite coated sand. The transport of malonic acid is dominated by multicomponent chemical interactions of protons and the malonic acid on the goethite surface and in solution. The experimental results show a fast breakthrough and a slow desorption of malonate. The binding capacity of the goethite coated silica sand column for malonic acid and acidity are discussed and their impact on elution is illustrated. The data have been predicted with a combination of the CD-MUSIC model and a one-dimensional convective-dispersive transport code. Reasonable agreement was obtained between data and model predictions.
ISSN:0927-7757
1873-4359
DOI:10.1016/S0927-7757(98)00698-0