This method is for the determination of surface contamination by lead and its compounds. The sample is collected on sterile cotton gauze pads or ashless quantitative filter paper. The procedure of NIOSH 7105 is used for extraction (ashed with concentrated nitric acid, followed by 30% hydrogen peroxide at 140 °C). Additional portions of nitric acid may be needed for complete digestion of the sample, including the pad. Use the procedures of NIOSH Methods 7300 (Elements by ICP), 7082 (Lead by flame AAS), 7105 (Lead by graphite furnace AAS), or other appropriate methods. Screening of all samples by flame AAS or ICP, followed by graphite furnace AAS for those samples giving "Not Detected" is an efficient scheme.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | None noted in method. |
| Preservatives: | None noted in method. |
| Required Preps: | Sample pads, 2" x 2", sterile cotton gauze or ashless quantitative filter paper. |
| Collection Method: | Sterile cotton gauze pads or ashless quantitative filter paper. |
| Analytical Methodology: | Various. |
| Documentation: | 
9100
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Lead | Pb |
7439-92-1 |
2 |
µg |
* 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.