Method 3515


This method is for the determination of 1,1-Dimethylhydrazine. The sample is collected in a glass bubbler containing 10mL of 0.1M HCL. To the solution, phosphomolybdic acid is added and the sample solution is heated for 60 minutes at 95°C. The solution is cooled under tap water, transferred to a cell and then analyzed by visible spectrophotometry at 730nm. The working range is 0.008 to 1 ppm (0.02 to 2.5 mg/m³) for a 100-L air sample. This method is also applicable to ceiling measurements. Note: This revises Method S143.

(NIOSH Issue 1: 15 August 1994)


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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   At least 5 days @ 25 °C.
Preservatives:   Store at room temperature.
Required Preps:   Glass bubbler containing 10mL of 0.1M HCl.
Collection Method:   Glass bubbler: 2L - 100L @ 0.2 - 1.0 L/min.
Analytical Methodology:   Visible Spectrophotometry.
Documentation:   3515

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.