Long-Term Evaluation of the Controlled Pressure Method for Assessment of the Vapor Intrusion Pathway
Vapor intrusion (VI) investigations often require sampling of indoor air for evaluating occupant risks, but can be confounded by temporal variability and the presence of indoor sources. Controlled pressure methods (CPM) have been proposed as an alternative, but temporal variability of CPM results an...
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| Veröffentlicht in: | Environmental science & technology 2015-02, Vol.49 (4), p.2091-2098 |
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| container_title | Environmental science & technology |
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| creator | Holton, Chase Guo, Yuanming Luo, Hong Dahlen, Paul Gorder, Kyle Dettenmaier, Erik Johnson, Paul C |
| description | Vapor intrusion (VI) investigations often require sampling of indoor air for evaluating occupant risks, but can be confounded by temporal variability and the presence of indoor sources. Controlled pressure methods (CPM) have been proposed as an alternative, but temporal variability of CPM results and whether they are indicative of impacts under natural conditions have not been rigorously investigated. This study is the first involving a long-term CPM test at a house having a multiyear high temporal resolution indoor air data set under natural conditions. Key observations include (a) CPM results exhibited low temporal variability, (b) false-negative results were not obtained, (c) the indoor air concentrations were similar to the maximum concentrations under natural conditions, and (d) results exceeded long-term average concentrations and emission rates under natural conditions by 1–2 orders of magnitude. Thus, the CPM results were a reliable indicator of VI occurrence and worst-case exposure regardless of day or time of year of the CPM test. |
| doi_str_mv | 10.1021/es5052342 |
| format | Article |
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| source | MEDLINE; American Chemical Society Journals |
| subjects | Air Pollutants - analysis Air Pollution, Indoor - analysis Air Pressure Environmental Monitoring - methods Environmental testing Housing Humans Indoor air quality Pressure Risk Assessment Time Factors Volatile Organic Compounds - analysis Volatilization |
| title | Long-Term Evaluation of the Controlled Pressure Method for Assessment of the Vapor Intrusion Pathway |
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