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Soil gypsum determination

AuthorsHerrero Isern, Juan CSIC ORCID ; Artieda Cabello, Octavio; Weindorf, D. C.
Issue DateNov-2020
PublisherSoil Science Society of America
John Wiley & Sons
CitationHerrero J, Artieda O, Weindorf DC. Soil gypsum determination. Soil Science Society of America Journal 84 (5): 1477-1484 (2020)
AbstractThe methods for gypsum content determination in soils are summarized and their applicability discussed. Special attention is given to the critical step of sample preparation, stressing the elimination of the oven heating at temperatures surpassing 40°C. Wet methods are unsuitable for soils rich in gypsum or containing other sulfates. Instead, oven‐based methods playing on the mass variations due to the release of constitutional water of gypsum are preferable. Under laboratory settings, we recommend two existing methods: one directly measuring the loss of mass on heating and the other exploiting the gypsum–bassanite phase change under controlled conditions. Both reflectance and X‐ray fluorescence (XRF) provide nondestructive methods for quick gypsum appraisal, and combining both methods increases the accuracy. The results are easily calibrated with gravimetric methods.
Description8 Pags. This article also appears in: Methods. This article was first published in Methods of Soil Analysis in 2016 and is being republished. The original citation was: Methods of Soil Analysis 2016, Vol. 1 Soil Science Society of America Journal © 2020 Soil Science Society of America Publication History Issue Online: 18 November 2020 Version of Record online: 18 November 2020 Manuscript accepted: 02 March 2016 Manuscript received: 21 January 2016.
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