This method is for the determination of mercury by cold vapor atomic absorption (CVAA). The sample is collected using a Hopcalite® tube. After collection the tube is desorbed with concentrated HNO3/HCl at 25°C, diluted and then analyzed by CVAA.
The sorbent material irreversibly collects elemental mercury. A pre-filter can be used to exclude particulate mercury from the sample. The prefilter can be analyzed by similar methodology if needed.
The working range of the method is 0.01 to 0.5 mg/m³ for a 10 L air sample.
NOTE: This method replaces NIOSH 6000 and its predecessors, which required a specialized desorption apparatus. This method is based on the method of Rathje and Marcero and is similar to the OSHA Method ID 145H.
(NIOSH Issue 2: 15 August 1994)
* 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.