Abstract

Previous research (RS-81-12) resulted in the design of a novel analytical technique for quantifying airborne asbestos levels. This project was undertaken to validate this chemical method, and to develop a reliable, simple, inexpensive, and rapid colorimetric test for chrysotile.

The results of chemical (atomic absorption) and standard (direct counting using optical microscopy) methods were compared, using several samples from mines and industry. The colorimetric method developed was validated by comparison with the results from the chemical method, using the same type of sample.

The chemical method is precise and very sensitive. The colorimetric method developed may be performed in one-fifth the time required for the chemical method. Although slightly less sensitive than atomic absorption, it permits the rapid identification of samples with concentrations either greatly above or greatly below the exposure limit.

The colorimetric method may be used as an initial screening test, and, in many cases, as a replacement for the existing analytical method. This method has been used for indoor air monitoring at the Université de Laval.