Print Email Facebook Twitter Extraction of soil solution by drainage centrifugation—effects of centrifugal force and time of centrifugation on soil moisture recovery and solute concentration in soil moisture of loess subsoils Title Extraction of soil solution by drainage centrifugation—effects of centrifugal force and time of centrifugation on soil moisture recovery and solute concentration in soil moisture of loess subsoils Author Fraters, D. Boom, G.J.F.L. Boumans, L.J.M. de Weerd, H. Wolters, M. Publication year 2017 Abstract The solute concentration in the subsoil beneath the root zone is an important parameter for leaching assessment. Drainage centrifugation is considered a simple and straightforward method of determining soil solution chemistry. Although several studies have been carried out to determine whether this method is robust, hardly any results are available for loess subsoils. To study the effect of centrifugation conditions on soil moisture recovery and solute concentration, we sampled the subsoil (1.5–3.0 m depth) at commercial farms in the loess region of the Netherlands. The effect of time (20, 35, 60, 120 and 240 min) on recovery was studied at two levels of the relative centrifugal force (733 and 6597g). The effect of force on recovery was studied by centrifugation for 35 min at 117, 264, 733, 2932, 6597 and 14,191g. All soil moisture samples were chemically analysed. This study shows that drainage centrifugation offers a robust, reproducible and standardised way for determining solute concentrations in mobile soil moisture in silt loam subsoils. The centrifugal force, rather than centrifugation time, has a major effect on recovery. The maximum recovery for silt loams at field capacity is about 40%. Concentrations of most solutes are fairly constant with an increasing recovery, as most solutes, including nitrate, did not show a change in concentration with an increasing recovery. © 2017, The Author(s). Subject Urban Mobility & EnvironmentEMS - Environmental Modelling, Sensing & AnalysisELSS - Earth, Life and Social SciencesEnvironment & SustainabilityEnvironmentUrbanisationCentrifuge drainageLeachingNutrientsPore waterSilt loamWater recovery To reference this document use: http://resolver.tudelft.nl/uuid:e5c04dbe-239c-4039-a241-5a0dc7643be4 DOI https://doi.org/10.1007/s10661-017-5788-7 TNO identifier 745609 Publisher Springer International Publishing ISSN 0167-6369 Source Environmental Monitoring and Assessment, 189 (2), 1-18 Article number 83 Bibliographical note Funding details: M/350001, EZ, Ministerie van Economische Zaken Document type article Files To receive the publication files, please send an e-mail request to TNO Library.