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1000
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Abstract/Summary
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The analytical method is validated for the determination of quartz and cristobalite in workplace air averaged over the sampling period after personal or stationary sampling. Sampling is performed by drawing a defined volume of air through a membrane filter located in the sampling head of the sampling device using a suitable pump. The respirable dust fraction is collected during sampling as stipulated in EN 481. Examples of sampling systems that have proved successful are PM 4F, VC 25F, FSP‐10, FSP‐BIA, and MPG II. Gravimetric determination of the respirable dust fraction is initially carried out, and then the concentration of quartz and cristobalite are determined in the respirable dust fraction with the aid of Fourier Transform Infrared Spectroscopy (FTIR). The determination is based on the blank value method and the method of calibration function in the lower measurement range according to DIN 32645. For the used sampling system FSP‐10 respectively PM‐4F the limit of quantification (LOQ) is 0.025 respectively 0.004 mg/m3 for a sampling period of two hours (air sample volume 120 litres / 8 m3) and 0.006 respectively 0.001 mg/m3 for a sampling period of eight hours (air sample volume 480 litres / 32 m3).
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