so2

Updated: January 27, 2026

Herr Hasenclever tested the Freytag method, in which the water is replaced by sulphuric acid, and obtained favorable results, as shown by the following analyses of the gases before and after treatment. The figures given are grammes per 1,000 liters: BEFORE. AFTER. SO2.

Various - Scientific American Supplement, No. 299, September 24, 1881