Abstract
Acrylic fibre samples can be prepared for sodium determination by low temperature radiofrequency ashing, by ignition in air and by wet oxidation with a mixture of sulphuric and nitric acids or sulphuric acid and hydrogen peroxide. The sodium is determined by flame photometry. A minimum of eleven determinations by each technique allows a statistical examination of the results. It is demonstrated that low temperature radiofrequency ashing offers advantages in both precision of analysis and simplicity of sample handling.
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