Screening Investigation Of Toxic Chemical Elements In School Supplies By X-ray Fluorescence [análise Exploratória Rápida E Não Destrutiva (screening) Da Presença De Elementos Químicos Tóxicos Em Material Escolar Por Fluorescência De Raios X]

摘要

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.