Method 7020

Calcium and Compounds (as Ca) by AA

This method is used for the determination of calcium and compounds as calcium. The sample is collected on cellulose ester membrane filters, ashed in concentrated nitric acid @ 140 °C followed by 60% (w/v) perchloric acid at 400 °C and then analyzed by flame atomic absorption. The working range is 1 to 20 mg/m³ for an 85 L sample. This is an elemental analysis, and not compound specific. Verify that the types of compounds in the samples are soluble with this ashing procedure. Aliquots of samples can be analyzed separately for many additional methods. NOTE: This method combines and replaces P&CAM 173 and S205. Method 7300 (ICP-AES) is an alternate.

(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 (0.8µm pore size).
Collection Method:   Filter: 20L - 400L @ 1 to 3 L/min.
Analytical Methodology:   Flame Atomic Absorption.
Documentation:   7020

Analyte List*

Analyte Formula CAS Number Detection Limit
Calcium dihydroxide
Calcium oxide
Calcium Carbonate

* 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.