Method ID-190

Nitric Oxide in Workplace Atmospheres

This method is for the determination of airborne nitric oxide (NO) in workplace air. The sample is collected on a set of three tubes in series. The first tube contains triethanolamine-impregnated molecular sieve. The middle tube, also called an oxidizer tube contains and inert carrier impregnated with a chromate salt. The third tube is identical to the first tube. The first tube does not capture NO and is only used to capture and convert any NO2 present to to NO2-. The middle tube then oxidizes the sampled NO to NO2. The third tube converts the NO2 to NO2-. The first and third tubes are desorbed using an aqueous triethanolamine solution and analyzed by ion chromatography (IC).

Analytical results for the first tube are reported as NO2 and the third tube are reported as NO. The middle tube is not analyzed.

Note: This method supersedes OSHA ID-109.



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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   The method says the samples are stable for at least 30 days if stored at 20-25°C.
Preservatives:   Store samples at 20-25°C.
Required Preps:   Two 400mg TEA-IMS tubes, one oxidizer tube containomg 1g chromate compound on an inert carrier (SKC 226-40)
Collection Method:   For NO and NO2 sample: 0.025 L/min. flow rate with a 4 hour collection time. For NO2 only: 0.2 L/min. flow rate with a minimum 15 minute collection time. 6L maximum collection volume
Analytical Methodology:   IC
Documentation:   ID-190

Analyte List*

Analyte Formula CAS Number Detection Limit
Nitric oxide

* 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.