Dear Emirhan,
sulphur in soap could be determined by ICP-OES (inductively coupled plasma optic emission spectroscopy) provided you can assure complete mdigestion of you soap sample. Digestion may be assure by nitric acid, hidrochloric acid, hydrogen peroxide and some mixtures from these acid/oxidizing agents. If you act the degestin in a microwave mineralizator be careful so that you work on little amount of sample (0,1-0,5 g or less in order to avoid explosion (sample with high organic content digested with oxidizing mixes with nitric acid and H2O2, cause high pressure increase in the mineralization vessels) ... see manufaturer's instructions.
Another method, more direct, in to analyze soap by XRF (XRay fluorescence). You can built up you calibration standard by mixing a soap matrix sulfur-free with increasing amount of sulphur.
Best wishes. MV.
It is also possible to use a CHNS combustion analyzer, if you have this at your disposal. It requires no pre-treatment of the sample, unlike ICP-OES. However, CHNS analyzers are less common than ICP-OES i believe.
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