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Química Nova

Print version ISSN 0100-4042On-line version ISSN 1678-7064


FRANCO JR., Jorge de O. et al. Comparative study of analytical methods for iron and titanium determination in Portland cement. Quím. Nova [online]. 2001, vol.24, n.2, pp.195-199. ISSN 0100-4042.

In the present work four different analytical methodologies were studied for the determination of iron and titanium in Portland cement. The cement samples were dissolved with hot HCl and HF, being compared Fe and Ti concentrations through four analytical methods: molecular absorption spectrophotometry using the reagents 1,2-hydroxybenzene-3,5-disulfonic acid (Tiron) and the 5-chloro-salicylic acid (CSA), inductively coupled plasma atomic emission spectrometry (ICP-AES) and flame atomic absorption spectrophotometry (FAAS). In the spectrophotometric determinations were studied pH conditions, reagents addition order, interferences, amount of reagents, linear range and stability of the system. In the techniques of ICP-AES and FAAS were studied the best lines, interferences, sensibility and linear range. The obtained results were compared and the agreement was evaluated among the methods for the determination of the metals of interest.

Keywords : Portland cement; iron determination; titanium determination.

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