Time-weighted average

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Question

The OEL for copper fume is 0.1 milligrams per cubic meter (mg/m3) as an 8-hour time-weighted average (TWA). To calculate the minimum sampling time required to detect this concentration, we use the formula:

Minimum sampling time = (concentration × volume of air sampled) / sampling rate

Assuming a concentration of 0.1 mg/m3, a sampling rate of 2 L/min, and a volume of air sampled of 240 liters (the recommended minimum volume for NIOSH 7302), the minimum sampling time required would be:

Minimum sampling time

= (0.1 mg/m3 × 240 L) / 2 L/min

= 12 minutes

Therefore, a minimum sampling time of 12 minutes is required to detect copper fume at the OEL of 0.1 mg/m3.

Where was the above formula obtained from? What source? How did they come up with 240 Liters, where does NIOSH 7302 mention this?

Reference no: EM133676025

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