Spectroscopic Study of Sediments from Chapala Lake in Western Mexico
| Autor: | Marta Eliane Doumer, G. Álvarez Lucio, A. García Huerta, Antonio S. Mangrich, S. Gómez Salazar, G. G. Carbajal Arízaga |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
inorganic chemicals
media_common.quotation_subject Analytical chemistry Fraction (chemistry) 010402 general chemistry 01 natural sciences law.invention Metal chemistry.chemical_compound law Organic matter Electron paramagnetic resonance Spectroscopy media_common chemistry.chemical_classification Chemistry 010401 analytical chemistry Extraction (chemistry) Sediment Condensed Matter Physics 0104 chemical sciences Speciation Oceanography visual_art visual_art.visual_art_medium Carbonate |
| Zdroj: | Journal of Applied Spectroscopy. 83:888-895 |
| ISSN: | 1573-8647 0021-9037 |
| Popis: | The first 10 cm of sediment from Lake Chapala, Western Mexico are in constant activity related to the exchange and speciation of metal cations. Samples of this sediment were analyzed in electron paramagnetic resonance (EPR) equipment to study the paramagnetic metals. Assays indicated that only Fe3+ was present in a detectable amount. This cation, along with chemical fractions of sediment obtained by sequential extraction, was analyzed by EPR. The analysis supported by infrared data revealed that Fe3+ was present in diluted and concentrated domains. Easily exchangeable iron was retained by carbonyl groups in organic matter. The carbonate fraction and oxides contained iron in concentrated domains. The alumina-silicate fraction (that resisted the sequential extraction digestions) presented diluted domains of iron in the octahedral alumina sheet along with occlusions of concentrated domains. This last inference was obtained by comparing EPR results against the spectrum of iron in synthetic model clay. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|