The standard “NIOSH 9100 Lead in Surface Wipe Samples,” designed by the National Institute for Occupational Safety and Health (NIOSH), describes a procedure for determining surface contamination with lead and its compounds.
The detection limit with this method is as follows:
The following equipment is mainly used in these tests:
When sampling, the template is placed over the area to be sampled and the outer edges are secured with masking tape. If the area to be sampled is limited and the template cannot be used, the sampling area is measured with a tape measure and the area to be sampled is outlined with masking tape. The tissue is folded into four pieces and the surface to be sampled is wiped with firm pressure. An overlapping “S” pattern is used to cover the entire surface area with horizontal strokes. The exposed side of the tissue is folded inward and the same area is wiped with vertical “S” strokes. The tissue is folded once more to reveal an unexposed surface and the surface is wiped a third time. The tissue is folded with the exposed side inward and placed in a clean, rigid-walled sample container (e.g., a 50 mL centrifuge tube). It is securely closed and the sample container is clearly labeled. Combining swab samples is not recommended because it causes sample preparation and analytical difficulties and because site-specific analytical information is lost. The template is cleaned in preparation for the next swab sample.
Sample preparation uses the NIOSH 7105 standard for determination of lead by graphite furnace atomic absorption spectrometry (GFAAS) or an equivalent procedure. This includes up to 10 mL of final sample dilution. Additional portions of nitric acid may be needed to completely digest the swab sample.
Depending on the detection limit required, the following NIOSH methods or equivalent methods are used:
One of the best ways to detect lead is to use lead sample wipes. These wipes collect dust and possible lead particles and are then placed in a centrifuge tube and sent for laboratory testing. Using these wipes makes sample preparation easier and more reliable for later analysis.
The American Society for Testing and Materials (ASTM) has specific guidelines for materials used to sample lead in surface dust. According to this organization, lead sampling wipes should be tested for:
Usually these wipes are individually wrapped. It is possible to use them in packs or boxes for sampling in large areas.
Our organization has a strong staff that closely follows the developments in the world in the field of science and technology and constantly improves itself. Numerous tests, measurements, analyses and Among the assessment studies, there are also testing services in accordance with the “NIOSH 9100 Lead in Surface Wipe Samples” standard.
To get an appointment, to get more detailed information or to request an evaluation, you can ask us to fill in our form and reach you.
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