Method 3512

Maleic Anhydride

This method is for the collection and analysis of maleic anhydride.  The sample is collected in 15mL of distilled water using a midget impinger sampling train.  Air is bubbled through the sample train and trapped in the distilled water.  The water from the impinger is collected and analyzed by HPLC with UV detection.  Maleic anhydride is converted to maleic acid so any native maleic acid in the sample will result in a positive bias.

The working range of the method is 0.025 to 0.75 ppm (0.1 to 3 mg/m³) for a 360L air sample. 

NOTE:  This method revises Method P&CAM 302.

(NIOSH Issue 1: 15 August 1994)


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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   Less than 7 days from sampling to analysis if samples are kept at 25°C.
Preservatives:   Store samples at 25°C or at refrigerated temperatures.
Required Preps:   15mL distilled water and a midget impinger sampling train
Collection Method:   The method recommends a flow rate of 0.2 - 1.5 L/min. and a 40 - 500L sample collection volume.
Analytical Methodology:   HPLC/UV
Documentation:   3512

Analyte List*

Analyte Formula CAS Number Detection Limit
Maleic Anhydride

* 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.