Temperature effect of tapered element oscillating microbalance (TEOM) system measuring semi-volatile organic particulate matter

2011 ◽  
Vol 13 (4) ◽  
pp. 1017 ◽  
Author(s):  
Luis-Antonio Tortajada-Genaro ◽  
Esther Borrás
Keyword(s):  
Particulate Matter ◽  
Temperature Effect ◽  
Organic Particulate Matter ◽  
Volatile Organic ◽  
Tapered Element Oscillating Microbalance

scholarly journals Linking Oxidative Events to Inflammatory and Adaptive Gene Expression Induced by Exposure to an Organic Particulate Matter Component

2012 ◽  
Vol 120 (2) ◽  
pp. 267-274 ◽  
Author(s):  
Wan-Yun Cheng ◽  
Jenna Currier ◽  
Philip A. Bromberg ◽  
Robert Silbajoris ◽  
Steven O. Simmons ◽  
...  
Keyword(s):  
Gene Expression ◽  
Particulate Matter ◽  
Organic Particulate Matter ◽  
Matter Component

scholarly journals Safety Assessment of the Presence of Heavy Metals and Organic Pollutants in Vended Street Foods from Selected Locations in Lagos State Nigeria

2020 ◽  
pp. 109-120
Author(s):  
G. I. Oyet ◽  
C. B. Samuel
Keyword(s):  
Heavy Metals ◽  
Particulate Matter ◽  
Organic Pollutants ◽  
Food Samples ◽  
Lead Content ◽  
Food Type ◽  
Street Food ◽  
Detectable Limit ◽  
Volatile Organic ◽  
Lagos State

This study was aimed at investigating the presence of heavy metals and volatile organic pollutants in street-vended foods sourced from three selected locations in Lagos State, Nigeria, to ascertain their safety level. The study was carried out using complete randomization design and Cluster sampling technique to source vended street foods from three locations (Marina, Yaba and Apapa). The eight Food products studied were roasted (plantain, fish, yam, corn), suya meat, meat pie, egg roll and doughnuts. Lead, Cadmium, Copper, Mercury, Iron, Zinc and organic pollutants in Foods and particulate matter in Environment were examined. Heavy metals detected in vended street foods from Marina, Yaba and Apapa Lagos were; iron, copper, lead and zinc, at level ranging from 0.14 mg/kg–2.80 mg/kg, 0.08 mg/kg – 0.27 mg/kg, 0.01 mg/kg – 0.18 mg/kg, and 0.01 mg/kg – 0.04 mg/kg, respectively. Mercury and Cadmium were below detectable limit. Significantly (P<0.05) higher iron presence of 2.80 mg/kg and 1.99mg/kg were respectively, noticed in suya from Apapa and roasted fish also from Apapa. Significantly (P<0.05) higher lead (Pb) content of 0.18 mg/kg was observed in dough nut from Yaba, however, roasted plantain, roasted fish and meat pie all sourced from Yaba gave significantly (P<0.05) lower lead content of 0.01mg/kg. The Zinc content of roasted fish, suya and egg roll sourced from Marina, Yaba and Apapa were all significantly (P<0.05) difference, with particular respect to food type. Higher iron content of 2.80 mg/kg was noticed in suya from Apapa. Volatile organic compounds (TPH, PAHs, Phenol) were observed to be below detectable limit (<0.001 mg/kg) in all the vended street food samples. Particulate matter in air; SPM, PM1, PM2.5, PM10 and VOCs ranged from 0.34 – 0.84 mg/m3, 0.32 – 0.56 mg/m3, 0.32 – 0.68 mg/m3, 0.33 – 0.79 mg/m3 and <0.001 – 0.24 mg/m3, respectively. PM1 and PM25 from the three locations were not statistically significant (P>0.05). All the vended food samples had lead (Pb) content above the CODEX permissible limit of 0.01 mg/kg. The presence of high lead content in Vended Street food is a major source of occupational health hazards.

scholarly journals Relative humidity-dependent viscosity of secondary organic material from toluene photo-oxidation and possible implications for organic particulate matter over megacities

2016 ◽  
Author(s):  
M. Song ◽  
P. F. Liu ◽  
S. J. Hanna ◽  
R. A. Zaveri ◽  
K. Potter ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Relative Humidity ◽  
Diffusion Coefficients ◽  
Organic Material ◽  
Organic Molecules ◽  
Mixing Times ◽  
Organic Particulate Matter ◽  
Photo Oxidation ◽  
Diffusion Rates ◽  
And Diffusion

Abstract. To improve predictions of air quality, visibility, and climate change, knowledge of the viscosities and diffusion rates within organic particulate matter consisting of secondary organic material (SOM) is required.Most qualitative and quantitative measurements of viscosity and diffusion rates within organic particulate matter have focused on SOM particles generated from biogenic VOCs such as α-pinene and isoprene. In this study, we quantify the relative humidity (RH)-dependent viscosities at 295 ± 1 K of SOM produced by photo-oxidation of toluene, an anthropogenic VOC. The viscosities of toluene-derived SOM were 2 × 10−1 to ∼6 × 106 Pa·s from 30 to 90 % RH, and greater than ~2 × 108 Pa·s (similar to or greater than the viscosity of tar pitch) for RH &amp;leq; 17 %. These viscosities correspond to Stokes-Einstein-equivalent diffusion coefficients for large organic molecules of ~2 × 10−15 cm2·s−1 for 30 % RH, and lower than ~3 × 10−17 cm2·s−1 for RH &amp;leq; 17 %. Based on these estimated diffusion coefficients, the mixing time of large organic molecules within 200 nm toluene-derived SOM particles is 0.1–5 hr for 30 % RH, and higher than ~100 hr for RH &amp;leq; 17 %. These results were used, as a first-order approximation, to estimate if organic particulate matter will be in well-mixed over the world's top 15 most populous megacities. If the organic particulate matter in the megacities is similar to the toluene-derived SOM in this study, in Kolkata, Istanbul, Dhaka, Tokyo, Shanghai, and Mumbai, mixing times in organic particulate matter during extended periods of the year will be very short, and well-mixed particles can be assumed. On the other hand, the mixing times of large organic molecules in organic particulate matter in Delhi, Beijing, Mexico City, Cairo, and Karachi may be long and the particles may not be well-mixed in the afternoon (3:00–5:00 local time) during certain times of the year.

scholarly journals Highly Viscous States Affect the Browning of Atmospheric Organic Particulate Matter

2018 ◽  
Vol 4 (2) ◽  
pp. 207-215 ◽  
Author(s):  
Pengfei Liu ◽  
Yong Jie Li ◽  
Yan Wang ◽  
Adam P. Bateman ◽  
Yue Zhang ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Organic Particulate Matter
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