Method 7900

Arsenic and Compounds (as As)

This method is used for the determination of arsenic and compounds as arsenic. The sample is collected on a cellulose ester membrane, ashed with concentrated nitric acid, sulfuric acid, and perchloric acid at 140 °C, and then analyzed by flame arsine generation Atomic Absorption. The working range is 0.00025 to 0.01 mg/m³ for a 200 L air sample, and 0.002 to 0.07 mg/m³ for a 30 L air sample. This method collects particulate arsenic only; if arsenic trioxide vapor is present, use the sampler in M7901. This is an elemental analysis, and not compound specific. Volatile organic arsenic compounds, such as arsenic trioxide vapor and arsine are not collected efficiently by this method. NOTEL This revises P&CAM 139; a similar method appears in the criteria document. M7901 uses a sampler designed to collect arsenic trioxide vapor and an alternate measurement technique (GFAAS). M7300 (ICP-AES) also gives an alternate measurement technique.

(NIOSH Issue 2: 15 August 1994)


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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   Stable if refrigerated
Preservatives:   Keep refrigerated
Required Preps:   Cellulose ester membrane filter (0.8 µm pore size).
Collection Method:   Filter: 30L to 1000L @ 1-3 L/min
Analytical Methodology:   Atomic Absorption, Flame Arsine Generation.
Documentation:   7900

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.