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

• DOI: 10.1071/sr04091
• Publication Date: 2005-05-27T05:29:26Z
• Authors: S. H. Doerr; C. T. Llewellyn; P. Douglas; C. P. Morley; K. A. Mainwaring; C. Haskins; L. Johnsey; C. J. Ritsema; F. Stagnitti; G. Allinson; D. Ferreira; J. J. Keizer; A. K. Ziogas; J. Diamantis
• Keywords: Fraction (chemistry)

After an initial evaluation of several solvents, the efficiency Soxhlet extractions with isopropanol/ammonia (s.g. 0.88) (70 : 30 v v; 24 h) in extracting compounds associated water repellency sandy soils was examined using a range repellent and wettable control (n = 15 4) from Australia, Greece, Portugal, The Netherlands, UK. Extraction role extracts causing soil by determining extract mass, sample organic carbon content (after drying at 20°C 105°C) pre- post-extraction, amounts aliphatic C–H removed DRIFT, assessing ability to cause acid-washed sand (AWS). Key findings are: (i) none content, amount C–H, or material extracted give any significant correlation for this diverse soils; (ii) 105°C is not necessarily useful before extraction, but may provide additional information on extraction effectiveness when used after extraction; (iii) completely 13 samples; (iv) all were capable inducing AWS. suggest that responsible represent only fraction composition their presence does always repellency.