A direct reading instrument for mercury vapour analysis indicates a concentration of 0.01 ppm. If you want to do an impinger sampling for mercury vapour, what should be in minimum sampling period given that the analytical instrument has a detection limit of 100 ppb (0.1 ppm)? The impinger volume will be 20 mL and a sampling rate 1.5 L/min will be used. Assume NTP. (MW of Hg = 200.59

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