n-BUTYLAMINE: METHOD 2012, Issue 1, dated 15 August 1994 - Page 4 of 4 [3] [4]
NIOSH Manual of Analytical Methods, 2nd. ed., V. 4, S138, U.S. Department of Health, Education, and Welfare, Publ. (NIOSH) 78-175 (1978). NIOSH/OSHA Occupational Health Guidelines for Occupational Hazards, U.S. Department of Health and Human Services, Publ. (NIOSH) 81-123 (1981), available as GPO Stock #017-03300337-8 from Superintendent of Documents, Washington, DC 20402.
METHOD REVISED BY: Paula Fey O'Connor, NIOSH/DPSE.
APPENDIX: PREPARATION OF SULFURIC ACID-TREATED SILICA GEL. Place a known amount of 20/40 mesh silica gel in a drying oven set at 125 °C for one hour. Cool the silica gel to a constant weight (W). Add reagent grade concentrated sulfuric acid dropwise by means of a pipet to 1.25 (W) or 25% by weight of the acid. Return the treated silica gel to the drying oven for one hour with intermittent mixing. Store the treated silica gel in an airtight container.
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94
