Analysis of the Major Constituents in Venezuelan Laterites;A Comparison of Atomic Absorption,X-ray Fluorescence,and Classical Methods

Abstract

A comparison of an atomic absorption method and x-ray fluorescence procedure for the analysis of the major constituents in Venezuelan laterites from Serranía de los Guaicas and bauxites is presented. These methods are also compared to other classical methods. The accuracy and precision of both these techniques are within the requirements needed. The HF-H₃BO₃ decomposition step is a disadvantage in the atomic absorption method because of the uncertainty in a complete sample dissolution of bauxites, but it has been shown to be suitable for Venezuelan laterites. The x-ray fluorescence technique presented herein is also limited because of its sample preparation, i.e., the use of expensive Pt-Au crucibles and the large quantity of sample needed.