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Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 543316
Title Validation of ISO/DIS 20244 Soil quality - screening method for water content - determination by refractometry
Author(s) Vark, Winnie van; Pellen, Peter; Crum, Steven; Harmsen, Joop
Source Wageningen : Wageningen Environmental Research (Wageningen Environmental Research report 2911) - 25
Department(s) WEPAL
Environmental Risk Assessment
Sustainable Soil Use
Publication type Research report
Publication year 2018
Abstract ISO/TC190/Soil Quality has developed a standard to enable measurement of water content in soil and soil-like materials using a screening method ISO/DIS 20244. To become a full standard, the screening method required validation to show the applicability and comparability of the method in different laboratories (repeatability and reproducibility). This validation was organised by WEPAL, (Wageningen Evaluating Programs for Analytical Laboratories), which is part of Wageningen University in the Netherlands. 11 laboratories participated in the validation. Samples with comparable and known water content were distributed. Repeatability and reproducibility were calculated according ISO 5725. The measured water contents were lower than measured with ISO 11465. Probably the sucrose solution is not able to extract all water. Correction of the result using clay content and or organic matter content may be possible, but needs further investigation. The responsible ISO Working Group has to decide if and how the results can be added to ISO/DIS 20244 to become a full standard.
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