scholarly journals Environmental Chamber Studies of Atmospheric Reactivities of Volatile Organic Compounds: Effects of Varying Chamber and Light Source

10.2172/57153 ◽  
1995 ◽  
Author(s):  
W. Carter ◽  
D. Luo ◽  
I. Malkina ◽  
J. Pierce
Keyword(s):  
Volatile Organic Compounds ◽  
Light Source ◽  
Organic Compounds ◽  
Environmental Chamber ◽  
Volatile Organic ◽  
Chamber Studies

Environmental chamber study of maximum incremental reactivities of volatile organic compounds

1995 ◽  
Vol 29 (18) ◽  
pp. 2499-2511 ◽  
Author(s):  
William P.L. Carter ◽  
John A. Pierce ◽  
Dongmin Luo ◽  
Irina L. Malkina
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Environmental Chamber ◽  
Volatile Organic ◽  
Chamber Study

Measurements of VOC Emission from Polyurethane Varnish for Interior Use

2012 ◽  
Vol 193-194 ◽  
pp. 345-350
Author(s):  
Jing Chen ◽  
Neng Zhu ◽  
Xin Li Shi
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Experimental Results ◽  
Total Volatile ◽  
Environmental Chamber ◽  
Voc Emission ◽  
Period 2 ◽  
Volatile Organic ◽  
Two Temperatures ◽  
Total Volatile Organic Compounds

The emission of volatile organic compounds (VOC) from single-component polyurethane varnish applied to beech plywood at two temperatures (33°C, 43°C) has been investigated in a small environmental chamber. The experimental results indicated that the concentration of each compound, as well as the total volatile organic compounds (TVOC), increased rapidly after the start of experiment, and attained their maximum values at 0.5 h. The concentrations decreased rapidly after 0.5 h, and then decreased more slowly in the period 2 – 24 h. The concentrations of isopropylbenzene, n-decane and TVOC were higher in the 43°C test than in the 33°C test within the first 1.5 h. The influences of temperature on the concentrations of these pollutants were different during the period 1.5 – 24 h.

scholarly journals Sensing of volatile organic compounds in indoor atmosphere and confined areas of industrial environments

2013 ◽  
Vol 10 (2) ◽  
pp. 217-225
Keyword(s):  
Volatile Organic Compounds ◽  
Light Source ◽  
Organic Compounds ◽  
Monochromatic Light ◽  
Chemical Vapour ◽  
Dip Coating ◽  
In Situ Monitoring ◽  
Light Power ◽  
Volatile Organic ◽  
Industrial Environments

A chemical vapour sensor working with a monochromatic light source and based on optical fibre coated with a thin siloxane polymer film has been developed for in situ monitoring of volatile organic compounds, such as ethylbenzene, xylene (o-xylene), heptane, octane, chloroform, carbon tetrachloride, ethanol and butanol in indoor atmosphere and confined areas of industrial environments. The sensor consists on a monomode optical fibre with an end surface coated with a thin polymeric film by dip-coating technique. The light source utilized was a stabilized laser diode at 1550 nm and the light power changes were measured with a photodiode. The sensor was tested for different VOCs and for different individual concentrations regarding stability, sensitivity, repeatability and reversibility of the analytical signal. The response and desorption time have been found to be 30 seconds and good reproducibility and accuracy have been also obtained. Finally, the analytical performance of the developed sensor was also evaluated and found adequate for actual monitoring on indoor atmospheres.

Characterization of an indoor environmental chamber and identification of C1–C4 OVOCs during isoprene ozonolysis

2020 ◽  
pp. 1420326X2092288
Author(s):  
Yan Tan ◽  
Chang Liu ◽  
Kinfai Ho ◽  
Qingxin Ma ◽  
Shun-Cheng Lee
Keyword(s):  
Volatile Organic Compounds ◽  
Relative Humidity ◽  
Organic Compounds ◽  
Proton Transfer Reaction ◽  
Aerosol Formation ◽  
Environmental Chamber ◽  
Analytical Instruments ◽  
Flight Mass Spectrometry ◽  
Volatile Organic ◽  
Wall Loss

An environmental chamber was built up and characterized at The Hong Kong Polytechnic University. The chamber consists of a 6 m3 poly tetrafluoroethylene-co-perfluoropropyl vinyl ether Teflon film reactor inside a stainless-steel enclosure stocked with a series of online gas-phase and aerosol-phase analytical instruments. Temperature and relative humidity are controllable and can be set to a range of 10–40 ± 1°C and 5–85%, ± 3%, respectively. An air purification system provides zero air for the chamber with concentrations of total volatile organic compounds < 1 ppb, NOX and O3 < 1 ppb and particles concentration < 102 particles·cm−3. Characterization experiments were performed under dry conditions (relative humidity< 5%) and ambient temperature (25°C). Average wall loss rates of O3 and NO2 were observed as 2.92 × 10−6 s−1 and 9.3 × 10−4 s−1 respectively, and the particle wall loss rate was 0.27 h−1. Dark ozonolysis of isoprene was studied using this chamber and the production of C1–C4 oxygenated volatile organic compounds such as formaldehyde, methacrolein and methyl vinyl ketone (MVK) was identified using proton-transfer-reaction time-of-flight mass spectrometry. Results of experiments indicate that this new facility can be used to investigate and simulate the gaseous chemistry and secondary aerosol formation.

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