National Institute for Occupational Safety and Health

“ During the development of the passive monitor method for ammonia (6701) , sulfuric acid-treated silica gel tubes were used as one of the reference methods [5] . The silica gel samples with IC analysis showed good agreement with the other reference methods, bubbler collection with colorimetric analysis using Nessler’s Reagent, and bubbler collection with IC analysis. A storage stability study compared the sulfuric acid-treated silica gel tube and sulfuric acid-treated carbon beads used in OSHA Method ID-188. ”

“ Personal sampling pump, 0.1 to 0.5 L/min, with flexible tubing. 3. Ion Chromatograph with conductivity detector, cation column and guard, and cation micromembrane suppressor (see p 6016-1) . 4. Syringes, 10-mL, polyethylene, Luer tip. 5. Centrifuge tubes, 15-mL, graduated, plastic with screw caps. 6. ”