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Sir: Hydrogen sulfide, hydrogen chloride, and water have been determined individually in a variety of materials by a number of investigators. Excellent background material can be found in the book by Jeffrey and Kipping (7) and the references contained therein. More recently Hodges and Matson (2) have separated C02, COS, H2S, CS2, and S02 using several different columns. Bennett (3) determined water in various organic materials using 5 % Carbowax 20M on Teflon powder. Prokop'eva and Bukina (4) coated all the brass in their system with PVC lacquer in the determination of Cl2, NOCI, and HC1. Philips and Owens (5) used a Teflon