Method 3503

Hydrazine by visible absorption spectrophotometry

This method is for the determination of hydrazine. The sample is collected in a glass midget bubbler with 15mL 0.1M HCl, and then analyzed by visible absorption spectrophotmetry at 480nm. The working ranges are 0.07 to 3 ppm (0.09 to 4 mg/m³) for 100-L air samples and 0.45 to 21 ppm (0.6 to 27 mg/m³) for 15-L air samples. This method is applicable to hydrazine vapor. It has not been tested with aerosol forms. The free base cannot be distinguished from salts, such as hydrazine monohydrochloride and hydrazine sulfate, which are aerosols. Note: This method is a modification of and replaces Method S237. Method P&CAM 248 is a gas chromatographic method which can be used for quantitation of hydrazine or substituted hydrazines. Methods S143, S149 and S160 utilize a non-specific colorimetric method for substituted hydrazines.

(NIOSH Issue 2: 15 August 1994)


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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   Up to 6 days @ 25 °C.
Preservatives:   Store at room temperature.
Required Preps:   Glass midget bubbler with 15ml 0.1M HCl.
Collection Method:   Glass midget bubbler: 7L - 100L @ 0.2 - 1.0 L/min.
Analytical Methodology:   Visible Absorption Spectrophotometry.
Documentation:   3503

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.