Total suspended particulate matter (TSP) concentration in ambient air is to be measured using a high volume sampler. The filter used for this purpose had an initial dry weight of 9.787 gm. The filter was mounted in the sampler and the initial air flow rate through the filter was set at 1.5 m 3 /min. Sampling continued for24 hours. The airflow after 24 hours was measured to be 1.4 m 3 /min. The dry weight of the filter paper after 24 hours sampling was 10.283 gm. Assuming a linear decline in the air flow rate during sampling, what is the 24 hours average TSP concentration in the ambient air?

Correct Answer is : 237.5 μg/m3

GATE Civil Engineering (CE) 2011 Solved Paper

Question : 52 of 65

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Total suspended particulate matter (TSP) concentration in ambient air is to be measured using a high volume sampler. The filter used for this purpose had an initial dry weight of 9.787 gm. The filter was mounted in the sampler and the initial air flow rate through the filter was set at 1.5 m³/min. Sampling continued for24 hours. The airflow after 24 hours was measured to be 1.4 m³/min. The dry weight of the filter paper after 24 hours sampling was 10.283 gm. Assuming a linear decline in the air flow rate during sampling, what is the 24 hours average TSP concentration in the ambient air?

59.2 μg/m³
118.6 μg/m³
237.5 μg/m³
574.4 μg/m³

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