The Method 26 (Hydrogen Halides, Halogens) Extension Kit for VersaCase (SK-626) is required for modification of the Method 6 Source Sampling Kit (SK-606) in order to perform Method 26.The sample is passed through a pre-purged heated probe and filter into dilute sulfuric acid then dilute sodium hydroxide solutions which collect all the gaseous hydrogen halides and halogens, respectively. The filter collects particulate matter including halide salts but is not routinely recovered and analyzed. The separate solutions are analyzed by ion chromatography.