Recebido em 5/7/12; aceito em 30/11/12; publicado na web em 8/3/13 SCREENING INVESTIGATION OF TOXIC CHEMICAL ELEMENTS IN SCHOOL SUPPLIES BY X-RAY FLUORESCENCE. Compulsory in Brazil, toy certification aims to prevent possible risks in toy use. The Brazilian National Institute of Metrology (INMETRO) establishes the maximum concentration of toxic elements (TE) that may be present in toys. This study evaluates the presence of TE in different crayons, gouache and modeling clays using X-ray fluorescence. This technique is fast, has low operating cost and minimum sample pretreatment, resulting in a clean procedure without reagent consumption and waste generation. Bromine (in gouache) and Barium (in crayons) were the only potentially TE identified in the samples studied.Keywords: school supplies; screening; X-ray fluorescence. INTRODUÇÃOProdutos como massa de modelar, tinta guache e giz de cera não são apenas empregados como material escolar, mas também são utilizados em atividades por crianças que ainda não atingiram a idade escolar. Nesta fase da vida, devem ser redobrados os cuidados com possíveis contaminações por elementos químicos tóxicos, pois podem ocorrer problemas sérios e irreversíveis.
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