Optimising rational chemical analysis for quantitative determination of the composition of clay in soils
| Autor: | T. A. Khabas, Vladimir I. Vereshagin, I.B. Revva, Valeriy M. Pogrebenkov, T. V. Vakalova |
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| Rok vydání: | 2018 |
| Předmět: |
inorganic chemicals
Oxalic acid 020101 civil engineering Geology 02 engineering and technology Ammonium oxalate engineering.material 010502 geochemistry & geophysics complex mixtures 01 natural sciences Chemical formula 0201 civil engineering Potassium oxide chemistry.chemical_compound chemistry Chemical engineering Geochemistry and Petrology Reagent Illite engineering Clay minerals Chemical composition 0105 earth and related environmental sciences |
| Zdroj: | Applied Clay Science. 163:153-163 |
| ISSN: | 0169-1317 |
| DOI: | 10.1016/j.clay.2018.07.014 |
| Popis: | A fractional (rational) chemical analytical method is proposed by which the material composition of clay rocks can be quantified and the clay-forming minerals present can be characterised. Subjecting raw clay to this procedure allows for the determination of the chemical composition of its fine-grained fraction, the amount and composition of exchangeable cations, water-soluble salts, carbonates and colloidal minerals, and the amount of amorphous silica and free quartz. A new, effective method is proposed for the qualitative and quantitative evaluation of the amorphous component in clays. This involves extracting colloids by treating the clay fractions with Tamm's reagent, a buffer solution of oxalic acid and ammonium oxalate with a pH of 3.25. Additionally, through calculations based on the results of chemical analyses, the illite content (derived from the content of non-exchangeable potassium oxide) and the chemical composition of the clay residue are determined. This enables the rock-forming clay mineral to be characterised and its structural chemical formula to be determined. This allows prediction of the physico-chemical and technological properties of the clay. |
| Databáze: | OpenAIRE |
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