Alkaline Extractable Silica - SOGLO Project
Description
Alkaline Extractable Silica. Samples collected in the framework of SOGLO, a BELSPO funded IUAP project, supported by the Belgian Science Policy Office (BelSPO) in the framework of the Inter University Attraction Pole project (P7/24): SOGLO – The Soil system under global change.
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Samples are collected in soil profile pits Locations of profile pits are given in WGS84 coordinates Samples are dried at 40-50°C during ca. 2-3 days biogenic and non-biogenic Alkaline extractable silica (AlkExSi) pools were distinguished using an alkaline extraction described in: Barão, L., Clymans, W., Vandevenne, F., Meire, P., Conley, D. J. and Struyf, E.: Pedogenic and biogenic alkaline-extracted silicon distributions along a temperate land-use gradient, Eur. J. Soil Sci., 65(5), 693–705, doi:10.1111/ejss.12161, 2014. Unzué-Belmonte, D., Struyf, E., Clymans, W., Tischer, A., Potthast, K., Bremer, M., Meire, P. and Schaller, J.: Fire enhances solubility of biogenic silica, Sci. Total Environ., 572, 1289–1296, doi:10.1016/j.scitotenv.2015.12.085, 2016. Samples was analyzed in a continuous flow analyzer (Skalar, Breda, the Netherlands), using a continuous alkaline extraction recently adapted for soils by Barão et al. (2014). The extraction in 180 mL of 0.5 M NaOH, at 85 °C runs for half an hour. Dissolved Si and dissolved aluminum (Al) are measured continuously (with the spectrophotometric molybdate blue method and the lumogallion fluorescence method, respectively), obtaining two dissolution curves which are fitted with first order equations. See results in: Dácil Unzué-Belmonte1, Yolanda Ameijeiras2, Sophie Opfergelt, Jean Minella3, Patrick Meire1, Eric Struyf1. Land use change affect biogenic silica pool distribution in a subtropical soil toposequence. In prep.