Validation of Cryogenic Vacuum Extraction of Pore Water from Volcanic Soils for Isotopic Analysis
| Autor: | Alex Godoy-Faúndez, Amaya Alvez, Karen Gutierrez, Laura Farías, Walter Valdivia-Cea, Mauricio Zambrano-Bigiarini, Diego Rivera |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
lcsh:Hydraulic engineering
Soil test Soil texture Geography Planning and Development 0207 environmental engineering Soil science 02 engineering and technology cryogenic vacuum extraction Aquatic Science Biochemistry lcsh:Water supply for domestic and industrial purposes lcsh:TC1-978 020701 environmental engineering Water content Water Science and Technology lcsh:TD201-500 Moisture Extraction (chemistry) Soil classification 04 agricultural and veterinary sciences Loam Soil water 040103 agronomy & agriculture volcanic soils isotopic analysis 0401 agriculture forestry and fisheries Environmental science |
| Zdroj: | Water Volume 11 Issue 11 Water, Vol 11, Iss 11, p 2214 (2019) |
| ISSN: | 2073-4441 |
| DOI: | 10.3390/w11112214 |
| Popis: | Andean headwater catchments are key components of the hydrological cycle, given that they capture moisture, store water and release it for Chilean cities, industry, agriculture, and cities in Chile. However, knowledge about within-Andean catchment processes is far from clear. Most soils in the Andes derive from volcanic ash Andosols and Arenosols presenting high organic matter, high-water retention capacity and fine pores and are very dry during summer. Despite their importance, there is little research on the hillslope hydrology of Andosols. Environmental isotopes such as Deuterium and 18-O are direct tracers for water and useful on analyzing water-soil interactions. This work explores, for the first time, the efficiency of cryogenic vacuum extraction to remove water from two contrasting soil types (Arenosols, Andosols) at five soil water retention energies (from &minus 1500 to &minus 33 kPa). Two experiments were carried out to analyse the impact of extraction time, and initial water content on the amount of extracted water, while a third experiment tested whether the cryogenic vacuum extraction changed the isotopic ratios after extraction. Minimum extraction times to recover over 90% of water initially in the soil samples were 40&ndash 50 min and varied with soil texture. Minimum volume for very dry soils were 0.2 mL (loamy sand) and 1 mL (loam). After extraction, the difference between the isotope standard and the isotopic values after extraction was acceptable. Thus, we recommend this procedure for soils derived from volcanic ashes. |
| Databáze: | OpenAIRE |
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