Extraction of compounds associated with water repellency in sandy soils of different origin

Doerr, S. H., Llewellyn, C. T., Douglas, P., Morley, C. P., Mainwaring, K. A., Haskins, C., Johnsey, L., Ritsema, C. J., Stagnitti, Frank, Allinson, G., Ferreira, A. J. D., Keizer, J. J., Ziogas, A. K. and Diamantis, J. 2005, Extraction of compounds associated with water repellency in sandy soils of different origin, Australian journal of soil research, vol. 43, no. 3, pp. 225-237.

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Title Extraction of compounds associated with water repellency in sandy soils of different origin
Author(s) Doerr, S. H.
Llewellyn, C. T.
Douglas, P.
Morley, C. P.
Mainwaring, K. A.
Haskins, C.
Johnsey, L.
Ritsema, C. J.
Stagnitti, Frank
Allinson, G.
Ferreira, A. J. D.
Keizer, J. J.
Ziogas, A. K.
Diamantis, J.
Journal name Australian journal of soil research
Volume number 43
Issue number 3
Start page 225
End page 237
Publisher CSIRO Publishing
Place of publication Collingwood, Vic.
Publication date 2005
ISSN 0004-9573
1446-568X
Keyword(s) water repellency
water repellence
hydrophobicity
extraction
aliphatic
DRIFT
Summary After an initial evaluation of several solvents, the efficiency of Soxhlet extractions with isopropanol/ammonia (s.g. 0.88) (70 : 30 v : v; 24 h) in extracting compounds associated with water repellency in sandy soils was examined using a range of repellent and wettable control soils (n = 15 and 4) from Australia, Greece, Portugal, The Netherlands, and the UK. Extraction efficiency and the role of the extracts in causing soil water repellency was examined by determining extract mass, sample organic carbon content and water repellency (after drying at 20°C and 105°C) pre- and post-extraction, and amounts of aliphatic C–H removed using DRIFT, and by assessing the ability of extracts to cause repellency in acid-washed sand (AWS).

Key findings are: (i) none of organic carbon content, amount of aliphatic C–H, or amount of material extracted give any significant correlation with repellency for this diverse range of soils; (ii) sample drying at 105°C is not necessarily useful before extraction, but may provide additional information on extraction effectiveness when used after extraction; (iii) the extraction removed repellency completely from 13 of the 15 repellent samples; (iv) extracts from all repellent and wettable control soils were capable of inducing repellency in AWS. The findings suggest that compounds responsible for repellency represent only a fraction of the extract composition and that their presence does not necessarily always cause repellency.
Language eng
Field of Research 050304 Soil Chemistry (excl Carbon Sequestration Science)
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2005, CSIRO
Persistent URL http://hdl.handle.net/10536/DRO/DU:30008800

Document type: Journal Article
Collection: School of Ecology and Environment
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