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 TABLE 4. INFRARED SAMPLING AND ANALYTICAL METHODS FOR CRYSTALLINE SILICA.

* Precision is noted in terms of CV (coefficient of variation) for all methods for convenience of comparison. CV is equivalent to $${s_r}$$(relative standard deviation). In some methods, precision is noted in terms of $$\overline{s_r}$$ (pooled relative standard deviation) which is equivalent to $$\overline{CV}$$

NMAM=NIOSH Manual of Analytical Methods, MSHA=Mine Safety and Health Administration, MDHS=Methods for Determination of Hazardous Substances, PVC=polyvinyl chloride, MCE=methyl cellulose ester, RF=radio frequency, KBr=potassium bromide, PAT=proficiency analytical testing, WASP=workplace analysis scheme for proficiency, LOD=limit of detection, CV=coefficient of variation.

Infrared Methods. IR methods include NMAM 7602, NMAM 7603, MSHA P-7, MDHS 37 and MDHS 38 [63-67]. Details of these methods are listed in Table 4. 3/15/03