Determinação colorimétrica do silício em vegetais
N. A. da Glória,A. A. Rodella +1 more
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In this paper, a preliminary study about the influence of several factors that may affect the molybdenum blue method was performed, such as the absorption of the MBL, oxalic acid, effect of time and pH on the formation of mBL and its reduction, influence of the use of hydrofluoric acid for solubilization of silicates and the reducing solutions.Abstract:
The present work reports a study about the determination of silicon in plant materials, using the method based in the formation of heteropoly blue complex (molybdenum blue method) A preliminary study about the influence of several factors that may affect the method was performed. It was studied the absorption of the molybdenum blue, the influence of oxalic acid, effect of time and pH on the formation of molybdsilicic acid and its reduction, the influence of the use of hydrofluoric acid for solubilization of silicates and the reducing solutions. Based in this preliminary studies, it was proposed a technique for the determination of silicon in plant materials employing the colorimetric method. In the recommended procedures the plant materials ash is treated with a mineral acid (HC1), hydrofluoric acid and excess of boric acid. The reduction of molybdisilicic acid is made using an acid ascorbic solution containing divalent iron. In all procedure it is not necessary the use of platinum or nickel ware. In order to compare the colorimetric (based in the proposed technique) and gravimetric methods, five replications of differents plant materials were analysed by both methods. The data obtained allowed to conclude that the technique proposed is good and the accuracy is satisfactory.read more
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Leaching of assimilable silicon species from fly ash
R. Piekos,S. Pasławska +1 more
TL;DR: In this paper, the authors investigate the leaching of assimilable silicon species from coal fly ash with distilled water, sea water and synthetic sea water at various fly ash/water ratios, pHs and temperatures.
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Exploitation of the molecular potential of plants:Equisetum arvense (EQUISETACEAE)
TL;DR: Commercial exploitation of silica (colloidal or solid) from Equisetum arvense is not feasible at present because: growing conditions of this plant species are not yet well defined; the disappearance of the plant during the winter months limits its period of exploitation; the silica content of the plants can vary over a six-fold range depending on weather and soil conditions, and so its economic potential is unpredictable.
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Short communicationsThe analysis of inorganic siliceous materials by atomic absorption spectrophotometry and the hydrofluoric acid decomposition technique: Part IV. The analysis of cements, clinkers, raw mixes and siliceous limestones
F.J. Langmyhr,P.E. Paus +1 more
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Colorimetric Determination of Silica in the Presence of Large Quantity of Phosphate A Silicomolybdate Methode
TL;DR: It is confirmed that 100% of patients taking 50mg/l anti-freeze contain anti-dementia-like properties.