Method ID-188


This method describes the sample collection and analysis of airborne ammonia. For ammonia collection, a personal sampling pump is used to draw a known volume of air (in the breathing zone of workplace personnel) through a glass tube containing carbon beads impregnated with sulfuric acid (CISA). Ammonia is collected and converted to ammonium sulfate. The sample is desorbed using a known volume of deionized water and analyzed as ammonium ion using an ion chromatograph. Ammonium chloride fume or ammonium sulfamate can be sampled and analyzed using this method. A 0.8-µm mixed-cellulose ester filter, polystyrene cassette, and personal sampling pump (2 L/min) are used to collect the sample. Samples are analyzed by ion chromatography after resorption in deionized water. Mixed-cellulose ester filters and polystyrene cassettes can be used as prefilters if particulates are a potential problem.



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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   None noted in method
Preservatives:   None noted in method
Required Preps:   Sampling tubes contain an adsorbing section consisting of carbon beads treated with sulfuric acid. Tube consists of two sections; a 500-mg carbon bead front and a 250-mg backup section; 10 cm × 8 mm OD × 6 mm ID.
Collection Method:   A sampling tube containing carbon beads impregnated with sulfuric acid (CISA) at a recommended volume of 24L @ 0.1L/min for TWA and 7.5L @ 0.5L/min for STEL.
Analytical Methodology:   Ion Chromatography (IC)
Documentation:   ID-188

Analyte List*

Analyte Formula CAS Number Detection Limit

* The analytes and detection limits listed for each method represent the typical detection limits and analytes reported for that particular method. Keep in mind that analyte lists may vary from laboratory to laboratory. Detection limits may also vary from lab to lab and are dependent upon the sample size, matrix, and any interferences that may be present in the sample.