AMMONIA: METHOD 6015, Issue 2, dated 15 August 1994 - Page 4 of 7 MEASUREMENT: 9.
10. 11.
12.
For a working range of 0.05 to 1.0 µg NH 3/mL, set up the manifold as shown in Figure 1 for AAII and as shown in Figure 2 for TRAACS. Higher concentrations may be accommodated by sample dilution. Allow both the colorimeter and the recorder to warm up for 30 minutes. Obtain a stable baseline with all reagents, feeding deionized water through the sample line. For normal conditions use a 30 or 40/hour 2:1 cam with a common wash for the AAII. For the TRAACS use a sampling rate between 90 and 120/hour with a 3:1, 4:1, or 5:1 sample/wash ratio. Arrange ammonia standards in sampler in order of decreasing concentration of nitrogen. Complete loading of sampler tray with unknown samples. Begin analysis.
CALCULATIONS: 13. 14.
Read NH 3 concentration (µg/mL) found in sample front (W f) and back (W b) sorbent sections directly from the instrument printout. Calculate the concentration (C) of NH 3 in the volume, V (L), of air sampled from the sample solution concentrations, W f and W b (µg/mL), multiplied by the appropriate solution volumes, V and V b (mL):
f
REFERENCES: [1] [2] [3]
[4] [5] [6] [7] [8] [9] [10]
DataChem Laboratories report for NIOSH Seq. 7482-L (NIOSH/DPSE, unpublished, May 20, 1992). NIOSH Manual of Analytical Methods, 2nd ed., Volume 5, S347, U.S. Department of Health, Education, and Welfare, Publ. (NIOSH) 79-141 (1979). Methods for Chemical Analysis of Water and Wastes, EPA-600/4-79-020 Revised March 1983, U.S. Environmental Protection Agency, Environmental Monitoring and Support Laboratory, Cincinnati, Ohio. Standard Methods for the Examination of Water and Wastewater, 16th ed., 1985, APHA, AWWA, WPCF. NIOSH Manual of Analytical Methods, 3rd ed., Method 6701, U.S. Department of Health, Education, and Welfare, Publ. (NIOSH) 84-100, February 1984. NIOSH Manual of Analytical Methods, 2nd ed., Volume 1, P&CAM 205, U.S. Department of Health, Education, and Welfare, Publ. (NIOSH) 77-157-A (1977). "Ammonia in Workplace Atmosphere" Method ID-164, Inorganic Methods Evaluation Branch, OSHA Analytical Laboratory, Salt Lake City, Utah. "Ammonia in Workplace Atmosphere" Method ID-188, Inorganic Methods Evaluation Branch, OSHA Analytical Laboratory, Salt Lake City, Utah, (April, 1988). The Merck Index, 11th Edition, 7206 Phenol, 2141 Chloroform, Merck & Co., Inc., Rahway, NJ (1989). NIOSH/OSHA Occupational Health Guidelines for Chemical Hazards, U.S. Department of Health and Human Services Publ. (NIOSH) 81-123 (1981), available as GPO Stock #17-033-00337-8 from Superintendent of Documents, Washington, D.C. 20402.
METHOD WRITTEN BY: Norman K. Christensen, DataChem Laboratories, Salt Lake City, Utah.
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94
