Recovery of gaseous emission from ground level area sources of ammonia and hydrogen sulfide using dynamic isolation flux chambers
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Controlled laboratory experiments were conducted to evaluate the recovery of ammonia (NH 3) and hydrogen sulfide (H 2S) emitted from ground level area sources (GLAS) using dynamic isolation flux chambers. H 2S (80-4,000 ppb) and NH 3 (5,000-40,000 ppb) were diffused through the flux chamber to simulate GLAS emissions while measuring the inlet and outlet flux chamber concentrations simultaneously. Results showed that the recovery of H 2S during a 30-minute sampling time was almost complete for concentrations greater than 2,000 ppb. At the lowest concentration of 80 ppb H 2S, about 92.55% of the gas could be recovered for the given sampling period. NH 3 emissions exhibited similar behavior between concentrations of 5,000-40,000 ppb. About 92.62% of NH 3 could be recovered within the same 30-minute sampling period and at the lowest concentration of 5,000 ppb. Complete recovery is achieved for concentrations greater than 40,000 ppb. Predictive equations were developed for gas adsorption. These equations predicted that the maximum difference between chamber inlet and outlet concentrations of NH 3 or H 2S was 7% at the lowest concentration used for either gas. The use of 46-90 m of Teflon tubing with the flux chambers had no effect on gas adsorption measurements because recovery was completed almost instantaneously at the beginning of the tests.
