| 摘要 |
A detector tube for detecting halogenated hydrocarbon compounds, preferably including first and second layers wherein the first layer comprises a carrier impregnated with hexavalent chromium and sulfuric acid to which is added an activator selected from the group consisting of 3-, 4-, and 5-valent compounds of nitrogen, 5- and 7-valent compounds of iodine and compounds of 4- and 6-valent selenium. A second layer for indicating the presence of a halogen or reaction product compound comprises a support material impregnated with a benzidine derivative, which may be positioned in a first tube with the first layer or in a second tube adapted for connection during detection with a first tube.
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