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| Natura: | Artículo científico |
| Lingua: | en |
| Pubblicazione: |
Asociación Argentina de Sedimentología
2022
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| Accesso online: | https://www.redalyc.org/articulo.oa?id=381779242004 |
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Sommario:
- APPLICABILITY OF CALCIMETRY IN LOW-CALCIUM CARBONATE SEDIMENTS. Cecilia G. Cantera Ivana Laura Ozán Ciencias de la Tierra on Non Ignition Detection Micromorphology In Earth and Environmental Sciences, pressure calcimetry is probably the most efficient and fast method to determine calcium carbonate (CaCO 3 ) content in rocks, sediments and soils. However, measurements of low-CaCO 3 samples can be less reliable by calcimetry, depending on the instrument used. This problematic is particularly relevant for sediments and soils with low content of CaCO 3 , very common in past and present lakes, soils and hydromorphic systems ( e.g., peatbogs, mires, wetlands), where CaCO 3 analysis contribute to understand water table changes, groundwater oscillation, ecology and wind-related processes, among others. In this context, this work presents a simple protocol to obtain accurate CaCO 3 determinations through pressure calcimetry in low-CaCO 3 samples (<4%), even though their CaCO 3 content falls below the limit of detection of the instruments. Calibration curves were first established with a CaCO 3 standard to calculate the critical value, detection limit and quantification limit, using two different pressure calcimeters. By considering these thresholds, a set of four natural samples with low-CaCO 3 content were measured by pressure calcimetry and also analyzed by Loss-on-Ignition and micromorphology. Results with 1 g of sample were lower than the detection limit. Accordingly, a gradual increase of sediment mass was applied until obtaining results above the quantification limit. The amount of CaCO 3 per g was thus inferred. Both calcimeters showed comparable results and high consistency with micromorphological observations. The CaCO 3 content calculated by Loss-on-Ignition showed slightly lower values, likely due to the loss of structural water and dehydroxylation of some minerals exposed to high temperature, affecting calculations of both organic and inorganic carbon. 2022 artículo científico 1851-4979 https://www.redalyc.org/articulo.oa?id=381779242004 en http://www.redalyc.org/revista.oa?id=3817 Latin American Journal of Sedimentology and Basin Analysis application/pdf Asociación Argentina de Sedimentología Latin American Journal of Sedimentology and Basin Analysis (Argentina) Num.2 Vol.29