“…Belcher and co-workers (25) employed flask combustion and titration with mercuric nitrate solution (diphenylcarbazone as indicator) for microgram amounts of chlorine, and a similar technique for sulfur (26) employing titration with barium perchlorate and Thoron as indicator. Dirscherl and Erne (79) proposed empty-tube combustion for the simultaneous determination of sulfur and halogens. The gaseous products were absorbed in peroxide solution and determined titrimetrically.…”