A quick method to determine the content of sulfates in silicic and aluminosilicate fillers

Barbara Sołtysik

doi:10.2478/v10026-007-0009-8

Abstract

A quick method to determine the content of sulfates in silicic and aluminosilicate fillers The paper presents the possibility of using barium-selective electrode to a potentiometric determination of sulfates in silicic and aluminosilicate fillers. The results of sulfates potentiometric titration in silicic and aluminosilicate fillers are described. A statistical interpretation of the results was carried out. The recommended method is based on the end-point detection of sulfates potentiometric titration in hydro-alcoholic medium by means of barium chlorate(VII) titrant. The potentiometric titration, which uses an ion-selective electrode as the indicator for the end-point was applied as the analytical technique. The parameter ranges for accurate sulfates determination in model solutions and the method of samples' preparation for analysis were investigated.

Highlights

In case of both silicic fillers and fuller's the earth presence of sulfates results in lowering the quality of products
Potentiometric titration for sulfates in silicic and aluminosilicate fillers On the basis of the research performed on the model solutions, the samples of real silicic fillers and fuller's earth were prepared for the analysis of sulfates' content
Potentiometric titrametry of sulfates in the optimal analytical conditions is possible with 0.1% accuracy

Summary

INTRODUCTION

In case of both silicic fillers and fuller's the earth presence of sulfates results in lowering the quality of products. The recommended method is based on the endpoint detection of potentiometric titration (with barium chlorate (VII) titrant) in the samples after the extraction of sulfates In this method, the ion-selective electrode works as the end-point marker of titration. A potentiometric titration of model sulfate solution was performed, as well as the titration in the medium composed of the following ions: Na+, K+, Ca2+, Fe3+, Al3+ (the matrix content of the primary sample) and PO43-. Potentiometric titration for sulfates in silicic and aluminosilicate fillers On the basis of the research performed on the model solutions, the samples of real silicic fillers and fuller's earth were prepared for the analysis of sulfates' content. The analytically determined results (relative errors and relative standard deviations) are presented in Table 2 and Table 3

Findings

DISCUSSION

CONCLUSIONS