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Empirical Relationship between Use, Area, and Ambient Air Concentration of Methyl Bromide
Author(s) -
Li LinYing,
Johnson Bruce,
Segawa Randy
Publication year - 2005
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq2005.0420a
Subject(s) - bromide , environmental science , air pollution , environmental chemistry , chemistry , atmospheric sciences , organic chemistry , geology
Methyl bromide (MeBr) is one of the most widely used soil fumigants. Human exposure to MeBr above threshold values can cause serious health problems. The exposure assessment of MeBr depends on estimation or measurement of its air concentrations. This study proposed a methodology for systematically exploring the empirical relationship between MeBr use intensity and ambient air concentrations. Monitored air concentrations were regressed to MeBr use over various spatiotemporal scales that step‐wise increased around the monitoring site and monitoring period. The results showed that the goodness‐of‐fit varied with the spatiotemporal scale of MeBr use. The best fit was Y = 0.46 + 0.00120 X ( R 2 = 0.95, n = 11), where Y was the 8‐wk average ambient air concentration (μg/m 3 ), and X was the weekly average use (kg/wk) over an area of 11.3 × 11.3 km (7 × 7 mi). The model was calibrated with air‐monitoring data and use data of 2000, and verified with the same type data of 2001. The model estimated subchronic air concentration with reasonable accuracy.