Abstract

PRIETO GARCIA, FRANCISCO et al. SYNTHESIS OF CALCIUM ARSENOALGINATE FORM ELIMINATION THE ARSENIATE IONS IN CONTAMINATED WATER. Dyna rev.fac.nac.minas [online]. 2007, vol.74, n.153, pp.167-179. ISSN 0012-7353.

Synthesis of calcium arsenoalginate was optimized using common sodium alginate, CaCl₂ and NaH₂AsO₄ which brought the arsenic. In order to evaluate the co-precipitation efficiency and elimination of arsenic, several concentrations of As, ranging from 20 to 1000 mg.L^-1 was tested including real contaminated water containing 480 mg.L^-1of arsenic. Optimized results, by means of factorial design matrix, pointed out the best synthesis conditions; sodium alginate concentration of 1.0 g.L^-1, pH 6, CaCl₂ concentration between 400-500 mgL^-1 and room temperature. Re-dissolution of the precipitates is promoted than sedimentation when temperature is greater than room temperature. The precipitates are crystalline solids that in future studies will be characterized more extensively in order to elucidate potential applications. In contaminated water the arsenic was eliminated with an efficiency of 96% these result allows to consider that is possible to reduce arsenic concentration until levels according to Mexican standard.

Keywords : arsenic; optimisation; efficiency; elimination; sediments.

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