Where can I find wipe sampling methods in SW-846?
Wipe sampling is only addressed in SW-846 in the context of laboratory safety concerns relative to dioxins and furans, and a very limited discussion of wipe sampling techniques appears in Appendix A to Method 8290A. However, EPA does not recommend that the procedure there be extended to other analytes or other situations. While wipe sampling has been described in the open literature, one of the biggest problems is that it is very difficult to interpret the results. By its very nature, the analysis of whatever material is used to wipe a surface (often filter paper wet with a solvent) yields the mass of the analyte(s), for example nanograms of dioxin or micrograms of another analyte. However, there is no straightforward way in which to convert that mass into a concentration per unit area, nor any good way in which to compare results from different wipes, except to say that one wipe picked up more material than another. If the surfaces that are wiped have different characteristics, for ex
