Sampling Guide for Air Contaminants in the Workplace - Irsst

IRSST – Sampling Guide for Air Contaminants in the Workplace
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List of Figures
Figure 1- Decision flowchart for exposure evaluation ............................................................................................. 4
Figure 2- Normal distribution .................................................................................................................................. 7
Figure 3- Lognormal distribution ............................................................................................................................. 7
Figure 4- Normal distribution of a series of 8-hour samples ................................................................................... 9
Figure 5- Illustration of the lower and upper confidence limits ............................................................................... 9
Figure 6- Classification using one-sided confidence limits .................................................................................... 10
Figure 7- Types of samples for characterizing an 8-hour exposure (TWAEV) ...................................................... 13
Figure 8- Example of excursion limit being exceeded with total time .................................................................... 16
Figure 9- Example of excursion limit being exceeded by increase in concentration .............................................. 16
Figure 10- Sampling train for microorganisms ...................................................................................................... 29
Figure 11- Calibration of a sampling train ............................................................................................................ 34
Figure 12- Calibration with a cyclone ................................................................................................................... 34
Figure 13- Summary of the flow rate correction process on the sampling site ...................................................... 37
List of Tables
Table 1- Selection tables for workers in a similar exposure group ........................................................................ 11
Table 2- Evaluation of the exposure of worker Y ................................................................................................... 14
Table 3- Exposure of a worker to a mixture of solvents ......................................................................................... 15
Table 4- Direct-reading instruments available at the IRSST .................................................................................. 20
Table 5- Temperature range for the use of some personal pumps .......................................................................... 33
Table 6- Utilization temperature intervals of some flow meters ............................................................................. 35
Table 7- Reference pressures and temperatures used by manufacturers for certain rotameters ........................... 36
Table 8- Reference pressures and temperatures used by manufacturers for some mass flow meters .................... 36