Spatial distribution of respiratory activity in Pseudomonas putida 54G biofilms degrading volatile organic compounds (VOC)

Methane and nonmethane volatile organic compounds (VOCs) were monitored near Boulder in the Northern Colorado Front Range to investigate their spatial distribution and sources as a part of the Front Range Air Pollution and Photochemistry Experiment (FRAPPE) and the Deriving Information on Surface conditions from Column and Vertically Resolved Observations Relevant to Air Quality (DISCOVER-AQ) campaign, in summer 2014. A particular emphasis was the study of the contribution of emissions from oil and natural gas (O&NG) operations on the regional air quality. One network extended along an elevation gradient from the City of Boulder (elevation ≈1,600 m) to the University of Colorado Mountain Research Station (≈2900 m) on the eastern slopes of the Rocky Mountains. Light alkane petroleum hydrocarbons had the highest mole fraction of the VOCs that could be analyzed with the applied techniques. The longer lived VOCs ethane and propane decreased with increasing elevation, suggesting that Boulder and the surrounding plains were a source of these anthropogenic compounds. VOC diurnal time series showed a few events with elevated mole fractions at the mountain sites, which were likely the result of the upslope transport of plumes with elevated VOCs from the plains. Within the other site network, which extended into suburban East Boulder County (EBC), VOCs were monitored at 5 sites increasingly close to O&NG development in the Denver Julesburg Basin. Mean mole fractions and variability of primarily O&NG-associated VOCs (ethane, propane, butane isomers) increased by a factor of 2.4–5.2 with closer proximity to the O&NG producing region. Median mole fractions of C2–C5 n-alkanes and of imuch-butane at the EBC sites were higher than those previously reported from 28 larger urban areas in the United States. Among the VOCs that could be quantified with the gas chromatography methods, VOCs most clearly associated to O&NG-related emissions (C2–C5 alkanes) accounted for 52%–79% of the VOC hydroxyl radical reactivity (OHR). The horizontal gradient in OHR of the considered VOCs, with ≈3 times higher values at the furthest eastern sites, points toward higher chemical reactivity and ozone production potential from these ozone precursors in the eastern area of the county than within the City of Boulder.

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Broad-spectrum antimicrobial activity of volatile organic compounds from endophytic Pseudomonas putida BP25 against diverse plant pathogens

Biocontrol Science and Technology ◽

10.1080/09583157.2019.1657067 ◽

2019 ◽

Vol 29 (11) ◽

pp. 1069-1089 ◽

Cited By ~ 9

Author(s):

Valiya Nadakkakath Agisha ◽

Aundy Kumar ◽

Santhosh Joseph Eapen ◽

Neelam Sheoran ◽

Rajamma Suseelabhai

Keyword(s):

Antimicrobial Activity ◽

Volatile Organic Compounds ◽

Pseudomonas Putida ◽

Organic Compounds ◽

Broad Spectrum ◽

Plant Pathogens ◽

Volatile Organic ◽

Diverse Plant

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Temporal and spatial distribution characteristics and source origins of volatile organic compounds in a megacity of Sichuan Basin, China

Environmental Research ◽

10.1016/j.envres.2020.109478 ◽

2020 ◽

Vol 185 ◽

pp. 109478 ◽

Cited By ~ 2

Author(s):

Qinwen Tan ◽

Hefan Liu ◽

Shaodong Xie ◽

Li Zhou ◽

Tianli Song ◽

...

Keyword(s):

Spatial Distribution ◽

Volatile Organic Compounds ◽

Organic Compounds ◽

Sichuan Basin ◽

Distribution Characteristics ◽

Temporal And Spatial Distribution ◽

Spatial Distribution Characteristics ◽

Volatile Organic ◽

Temporal And Spatial

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Tempo-spatial variation of emission inventories of speciated volatile organic compounds from on-road vehicles in China

Atmospheric Chemistry and Physics ◽

10.5194/acp-9-6983-2009 ◽

2009 ◽

Vol 9 (18) ◽

pp. 6983-7002 ◽

Cited By ~ 20

Author(s):

H. Cai ◽

S. D. Xie

Keyword(s):

Spatial Distribution ◽

Volatile Organic Compounds ◽

Organic Compounds ◽

Annual Variation ◽

Emission Inventories ◽

Road Vehicles ◽

Growth Trend ◽

Volatile Organic ◽

High Emission ◽

Benzene Toluene

Abstract. Emission inventories of sixty-seven speciated non-methane volatile organic compounds (NMVOC) from on-road vehicles in China were estimated for the period of 1980–2005, using seven NMVOC emission profiles, which were summarized based on local and international measurements from published literatures dealing with specific vehicle categories running under particular modes. Results show an exponential growth trend of China's historical emissions of alkanes, alkenes, alkines, aromatics and carbonyls during the period of 1980–2005, increasing from 63.9, 39.3, 6.9, 36.8 and 24.1 thousand tons, respectively, in 1980 to 2778.2, 1244.5, 178.7, 1351.7 and 406.0 thousand tons, respectively, in 2005, which coincided well with China's economic growth. Emission inventories of alkenes, aromatics and carbonyls were gridded at a high resolution of 40 km×40 km for air quality simulation and health risk evaluation, using the geographic information system (GIS) methodology. Spatial distribution of speciated NMVOC emissions shows a clear difference in emission densities between developed eastern and relatively underdeveloped western and inland China. Besides, the appearance and expansion of high-emission areas was another notable characteristic of spatial distribution of speciated NMVOC emissions during the period. Emission contributions of vehicle categories to speciated NMVOC groups showed annual variation, due to the variance in the provincial emissions and in the relative fractions of the seven emission profiles adopted at the provincial level. Highly reactive and toxic compounds accounted for high proportions of emissions of speciated NMVOC groups. The most abundant compounds were isopentane, pentane and butane from alkanes; ethene, propene, 2-methyl-2-butene and ethyne from alkenes and alkines; benzene, toluene, ethylbenzene, o-xylene, and m,p-xylene (BTEX) and 1,2,4-trimethylbenzene from aromatics and formaldehyde, acetaldehyde, benzaldehyde and acetone from carbonyls.

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