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Metals Frequently Asked Questions
Environmental Lead Sampling
Q: How do I take a wipe sample?
A: Locate a square or rectangular area to be tested. Mark off the area using masking tape, a marker, or some other device. Measure the length and width and record it. Remove the wipe from its packaging and unfold it. Wipe the area until it is visibly clean, making sure to pass over the area horizontally, vertically and diagonally. Place the wipe in the shipping tube and label the sample with a unique ID.
Q: Where do I get the wipe to do this sampling?
A: WOHL can provide you with the necessary wipe media. There is no additional cost for this media.
Q: How much paint do you need to perform lead analysis?
About one square inch. It is best to take the sample from an area which is peeling or cracking.
Q: What do my wipe results mean?
A: EPA recognizes a lead hazard at 40 ug/square foot for floor wipes, 250 ug/square foot for interior window sill wipes, 400 ppm for soil in a child's play area, 1200ppm for soil in the remainder of a yard and 0.5% for paint. The state of Wisconsin has a lower limit of 0.06% in paint.
Q: What do I do if my results indicate a potential hazard?
A: Contact your local county or state health agency. In Madison, WI, contact Joe Schirmer at 608-266-5817.
Industrial Hygiene Metals
Q: What media should I use for air sampling?
A: This varies based on the types of metals you are attempting to quantitate. Please follow these guildelines:
If you are only interested in metals analysis then use a 3PW MCE filter.
|For total weights and metals, including welding fumes, use a 2PY PVC.|
|For sodium and potassium, use a two-piece clear banded PVC. Total weight is not available with sodium/potassium analysis.|
Q: What flow rate should I use?
A: 2.0 L/min for metals on cassettes. 0.2L/min for mercury vapor collected on carulite tubes.
Q: Can I sample for all metals and compounds together on one filter?
A: Yes, with the exception of silver (MCEF), zirconium (2PYF), titanium dioxide (2PYF), tungsten (2PYF), sodium, and potassium.
Q: What media for wipe sampling should I use?
A: Whatman filters dampened with distilled water.
Q: What are your detection limits?
A: Detection levels vary by compound. We can provide a detailed list if you contact the laboratory.