Revista de Ciencias Químicas

In this paper the influence of solvent dielectric constant on the rate of oxidation of p-methoxybenzaldehyde and pmethylbenzaldehyde with t-BuOCl has been studied in various solvent mixtures of acetic acid and water. The results indicate that in the oxidation of p-methoxybenzaldehyde with t-BuOCl the rate increases with increase in the percentage of acetic acid (from 10% to 40%), but the rate decreases with further increace in acetic acid content (50-80% HOAc). In the oxidation of p-methylbenzaldehyde with t- BuOCl the rate is maximum at 50% HOAc and decreases on either side of this percentage.

Nanometer-sized titanium dioxide prepared in the Lab chemically modified with 8-hydroxyquinolin and used for selective solid phase extraction processes, separation and preconcentration process of aluminum (III) from aqueous solutions prior to its determination by Inductively Coupled Plasma optical emission-Mass spectrometry(ICP-MS) and Graphite furnace atomic Absorption Spectrometry(GFAAS). The optimal conditions for the proposed solid phase extraction (SPE: 0,1g of TiO2- modified oxine, 6h shaking time,
pH 6.5). The experimental results was fitted well to Langmuir isotherm equation to determine the maximum adsorption capacity.The static maximum adsorption capacity was 69.013mg/g. The lowest concentration of aluminum (Al+3) was (30.0μg/L) and the highest concentration was (14585μg/L). The method was successfully applied to the determination of trace of aluminum in areas near to the factories in
east of Tripoli.