Method 3510


This method is for the determination of monomethylhydrazine. The sample is collected through a glass midget bubbler with 15mL of 0.1M HCl, and analyzed by visible spectrophotometry. The working range is 0.027 to 2.7 ppm (0.05 to 5 mg/m³) for a 20-L air sample. This method is applicable to STEL (short term exposure limit) and ceiling measurements. Note: This revises Method S149. Method P&CAM 248 describes an acid-coated silica gel sorbent tube/gas chromatographic method for the determination of hydrazine, monomethylhydrazine, 1,1-dimethylhydrazine and phenylhydrazine, but sample stability problems have been noted with it.

(NIOSH Issue 1: 15 August 1994)


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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   At least five days @ 25 °C.
Preservatives:   Store at room temperature.
Required Preps:   Glass bubbler: 15mL of 0.1M HCl.
Collection Method:   Glass bubbler: 3L - 20L @ 0.5-1.5L/min.
Analytical Methodology:   Visible Spectrophotometry.
Documentation:   3510

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.