Laboratory Measurements of Parameters Affecting Wet Deposition of Methyl Iodide.

摘要

The transfer of gaseous methyl iodide (CH3I) to raindrops and the initial retention by vegetation of CH3I in raindrops have been studied in a laboratory experimental program. The measured air-to-drop transfer parameters and initial retention factors both affect the wet deposition of methyl iodide onto vegetation. No large effects on the air-to-drop transfer due to methyl iodide concentration, temperature, acidity, or rain type were observed. Differences between laboratory measurements and theoretical values of the mass transfer coefficient were found. Grass, lettuce, and alfalfa were used to study initial retention of methyl iodide by vegetation. Only a small fraction of the incident CH3I in raindrops was held by any of the three vegetation types.