Operational speciation of Cd, Cr, Cu, Mn, Ni, pb, V, zn in dust samples from school in Caracas, Venezuela

A method of sequential extraction was applied to analyze Cd, Cr, Cu, Mn, Ni, Pb, Zn Vy in samples of dust from city schools located in areas of merger with different total suspended particulates. The objective of this work was to study the fraccionamiento chemical elements in this kind of samples. This information can understand the process in connection with the origin, the mobilization and transport of metal. Once the digestion of samples were determined the merger and partial totals of metal. The results obtained for both the total digestion how to sequential extraction are comparable. Certain metals are associated with different forms chemical. Pb, Zn Cu and partners are mainly to the stage and Carbonate Oxide or to phase organic Yv, Mn, and Cd is Cr mainly in the present stage Oxide, but are also present in smaller share in the stage residual. Multivariate analysis (principal component) were able to make a fraccionamiento and possible sources of these items.