Method 7901

Arsenic Trioxide (as As)

This method is used for the determination of arsenic trioxide. The sample is collected on cellulose ester membrane filters impregnated with sodium bicarbonate, ashed with nitric acid and hydrogen peroxide at 150 °C, and then analyzed by graphite furnace atomic absorption. The working range is 0.001 to 0.06 mg/m³ for a 200L air sample. This method collects particulate arsenic compounds as well as arsenic trioxide vapor. If only total particulate arsenic is of interest, the use of treated filter and analysis of the backup pad is not required. Arsine is not collected by this sampling method. NOTE: This method combines and replaces P&CAM 346, S309, and P&CAM 286. M7300 (ICP-AES) and arsine generation (M7900 and the criteria document method) are for particulate arsenic compounds. Other methods (P&CAM 173, P&CAM 180, P&CAM 188) have not been revised because of interferences or poor sensitivity.

(NIOSH Issue 2: 15 August 1994)


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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   Stable
Preservatives:   Stable
Required Preps:   Cellulose ester membrane filter impregnated with sodium bicarbonate (0.8-µm pore size) and backup pad.
Collection Method:   Filter: 30L to 1000L @ 1-3 L/min
Analytical Methodology:   Graphite furnace atomic absorption
Documentation:   7901

Analyte List*

Analyte Formula CAS Number Detection Limit
Arsenic Trioxide

* 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.