(under the class definition) Subject matter in which the
compound or composition to be investigated is or contains sulfur.
(1) Note. As used herein sulfur oxide includes gaseous sulfur dioxide and its aqueous solution but does not include sulfur trioxide, sulfuric acid or its salts which are classified in subclass 102 above.
(2) Note. This subclass is intended to provide for tests for "sulfur radicals", e.g., sulfate, etc., for a determination of the total sulfur present without reference to the particular compound or radical containing the sulfur.
