Asbestos Analysis: EPA 400 Point Count
Asbestos analysis includes testing of bulk building materials for asbestos by performing 400 point counts (EPA 600/R-93/116). This is a detailed and more labor-intensive technique for estimating asbestos in a building material and is less subjective than a visual estimate. While the visual estimation of asbestos in a building material works well for most samples, this methodology can be very important when low asbestos concentration in a building material is suspected or detected. This methodology, which has a detection limit of 0.25%, increases the accuracy and precision of the asbestos concentration determined in a sample and is widely used to comply with NESHAP regulations requirement of performing point counting on samples with low concentrations of asbestos.
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