scholarly journals Characterizing sources and emissions of volatile organic compounds in a northern California residence using space‐ and time‐resolved measurements

Indoor Air ◽  
2019 ◽  
Author(s):  
Yingjun Liu ◽  
Pawel K. Misztal ◽  
Jianyin Xiong ◽  
Yilin Tian ◽  
Caleb Arata ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Northern California ◽  
Time Resolved ◽  
Space And Time ◽  
Volatile Organic ◽  
Time Resolved Measurements

scholarly journals Integrating Personal Air Sensor and GPS to Determine Microenvironment-Specific Exposures to Volatile Organic Compounds

Sensors ◽  
2021 ◽  
Vol 21 (16) ◽  
pp. 5659
Author(s):  
Michael S. Breen ◽  
Vlad Isakov ◽  
Steven Prince ◽  
Kennedy McGuinness ◽  
Peter P. Egeghy ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Google Earth ◽  
Consumer Products ◽  
Classification Model ◽  
Health Concern ◽  
Single Family ◽  
Time Resolved ◽  
High Exposure ◽  
Volatile Organic

Personal exposure to volatile organic compounds (VOCs) from indoor sources including consumer products is an understudied public health concern. To develop and evaluate methods for monitoring personal VOC exposures, we performed a pilot study and examined time-resolved sensor-based measurements of geocoded total VOC (TVOC) exposures across individuals and microenvironments (MEs). We integrated continuous (1 min) data from a personal TVOC sensor and a global positioning system (GPS) logger, with a GPS-based ME classification model, to determine TVOC exposures in four MEs, including indoors at home (Home-In), indoors at other buildings (Other-In), inside vehicles (In-Vehicle), and outdoors (Out), across 45 participant-days for five participants. To help identify places with large emission sources, we identified high-exposure events (HEEs; TVOC > 500 ppb) using geocoded TVOC time-course data overlaid on Google Earth maps. Across the 45 participant-days, the MEs ranked from highest to lowest median TVOC were: Home-In (165 ppb), Other-In (86 ppb), In-Vehicle (52 ppb), and Out (46 ppb). For the two participants living in single-family houses with attached garages, the median exposures for Home-In were substantially higher (209, 416 ppb) than the three participant homes without attached garages: one living in a single-family house (129 ppb), and two living in apartments (38, 60 ppb). The daily average Home-In exposures exceeded the estimated Leadership in Energy and Environmental Design (LEED) building guideline of 108 ppb for 60% of the participant-days. We identified 94 HEEs across all participant-days, and 67% of the corresponding peak levels exceeded 1000 ppb. The MEs ranked from the highest to the lowest number of HEEs were: Home-In (60), Other-In (13), In-Vehicle (12), and Out (9). For Other-In and Out, most HEEs occurred indoors at fast food restaurants and retail stores, and outdoors in parking lots, respectively. For Home-In HEEs, the median TVOC emission and removal rates were 5.4 g h−1 and 1.1 h−1, respectively. Our study demonstrates the ability to determine individual sensor-based time-resolved TVOC exposures in different MEs, in support of identifying potential sources and exposure factors that can inform exposure mitigation strategies.

Extending PTR based breath analysis to real-time monitoring of reactive volatile organic compounds

The Analyst ◽  
2019 ◽  
Vol 144 (24) ◽  
pp. 7359-7367 ◽  
Author(s):  
Giovanni Pugliese ◽  
Phillip Trefz ◽  
Beate Brock ◽  
Jochen K. Schubert ◽  
Wolfram Miekisch
Keyword(s):  
Volatile Organic Compounds ◽  
Real Time ◽  
Organic Compounds ◽  
Bacterial Activity ◽  
Mass Spectrometric ◽  
Real Time Monitoring ◽  
Metabolic Processes ◽  
Time Resolved ◽  
Volatile Organic ◽  
Sulfur Containing

Direct time resolved mass spectrometric monitoring of reactive exhaled nitrogen- and sulfur-containing volatile organic compounds (VOCs) related to metabolic processes, diseases and bacterial activity.

scholarly journals Turbulent exchange and segregation of HO<sub>x</sub> radicals and volatile organic compounds above a deciduous forest

2009 ◽  
Vol 9 (6) ◽  
pp. 24423-24476 ◽  
Author(s):  
R. Dlugi ◽  
M. Berger ◽  
M. Zelger ◽  
A. Hofzumahaus ◽  
M. Siese ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Forest Canopy ◽  
Deciduous Forest ◽  
Sonic Anemometer ◽  
Proton Transfer Reaction ◽  
Eddy Covariance Method ◽  
Time Resolved ◽  
Volatile Organic ◽  
Gas Measurements

Abstract. The eddy covariance method was applied for the first time to estimate fluxes of OH and HO2 together with fluxes of isoprene, the sum of methyl vinyl ketone (MVK) and methacrolein (MACR) and the sum of monoterpenes above a mixed deciduous forest. Highly sensitive measurements of OH and HO2 were performed by laser induced fluorescence (LIF), and biogenic volatile organic compounds (BVOCs) were measured by Proton-Transfer-Reaction Mass Spectrometry (PTR-MS) at a time resolution of 5 s, each. Wind speed was measured by a sonic anemometer at 10 Hz. The one-day feasibility study was conducted at a total height of 37 m, about 7 m above forest canopy, during the ECHO 2003 intensive field study in July 2003. The daytime measurements yielded statistically significant OH fluxes that indicate downward transport of OH into the direction of the canopy and HO2 fluxes mainly upward out of the canopy. This hints towards a significant chemical sink of OH by reaction with BVOCs and conversion of OH to HO2 at the canopy. In addition, the highly time-resolved trace gas measurements were used to calculate the intensity of segregation of OH and BVOCs, demonstrating that the effective reaction rate of isoprene and OH was slowed down as much as 15% due to inhomogeneous mixing of the reactants. The paper describes the applied methods and provides a detailed analysis of possible systematic errors of the covariance products.

Environmental sampling of volatile organic compounds during the 2018 Camp Fire in Northern California

2021 ◽  
Vol 103 ◽  
pp. 135-147
Author(s):  
Leslie A. Simms ◽  
Eva Borras ◽  
Bradley S. Chew ◽  
Bruno Matsui ◽  
Mitchell M. McCartney ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Environmental Sampling ◽  
Northern California ◽  
Volatile Organic

Aging of Volatile Organic Compounds in October 2017 Northern California Wildfire Plumes

2022 ◽  
Author(s):  
Yutong Liang ◽  
Robert J. Weber ◽  
Pawel K. Misztal ◽  
Coty N. Jen ◽  
Allen H. Goldstein
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Northern California ◽  
Volatile Organic
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