标题：DETERMINACIÓN POLAROGRÁFICA DE CONTAMINANTES METÁLICOS PARA EL CONTROL DE CALIDAD DE ÁCIDO FOSFÓRICO GRADO TÉCNICO EMPLEADO EN LA PRODUCCIÓN DE FOSFATOS GRADO ALIMENTARIO
期刊名称：Revista Internacional de Contaminación Ambiental
印刷版ISSN：0188-4999
出版年度：2014
卷号：30
期号：1
页码：113-120
语种：Spanish
出版社：Centro de Ciencias de la Atmósfera
摘要：Phosphates are more versatile additives in food industry, among other applications are used as preservatives, pH buffers, antioxidants, emulsifiers, acidifying agents, dispersants, etc. The phosphates are derived from phosphoric acid and this in turn is obtained in large quantities from a mineral known as fluorapatite; by the nature of the ore which gives rise to the phosphoric acid is important the analysis of various metal species that may be toxic to humans. Lead, cadmium and arsenic are present in the fluorapatite; in the same way may be present trace elements such as copper, zinc and iron if consumed in excess daily requirements can be harmful to health. In this paper we analyzed four samples of technical grade phosphoric acid (used for the manufacture of food grade phosphates) by differential pulse polarographic technique, employing HNO 3 /KNO 3 0.1 mol L -1 with a three-electrode system. The detection limits found forAs III , Pb II , Cd II , Cu II , U VI (como (UO 2 ) 2- ) y Zn II were below the limits required by the international food additives rules and regulations. We identified and quantified Cd II and Zn II in all samples analyzed, Cu II in two of the samples and As III and U VI in one sample each one.
其他摘要：Phosphates are more versatile additives in food industry, among other applications are used as preservatives, pH buffers, antioxidants, emulsifiers, acidifying agents, dispersants, etc. The phosphates are derived from phosphoric acid and this in turn is obtained in large quantities from a mineral known as fluorapatite; by the nature of the ore which gives rise to the phosphoric acid is important the analysis of various metal species that may be toxic to humans. Lead, cadmium and arsenic are present in the fluorapatite; in the same way may be present trace elements such as copper, zinc and iron if consumed in excess daily requirements can be harmful to health. In this paper we analyzed four samples of technical grade phosphoric acid (used for the manufacture of food grade phosphates) by differential pulse polarographic technique, employing HNO3/KNO3 0.1 mol L-1 with a three-electrode system. The detection limits found forAsIII, PbII, CdII, CuII, UVI (como (UO2)2-) y ZnII were below the limits required by the international food additives rules and regulations. We identified and quantified CdII and ZnII in all samples analyzed, CuII in two of the samples and AsIII and UVI in one sample each one.
关键词：phosphoric acid; phosphates; electrochemical study; differential pulse polarography; quality control; food additives;ácido fosfórico; fosfatos; estudio electroquímico; polarografía diferencial de impulsos; control de calidad; aditivos alimenticios
