Detection of volatile organic chemicals by using liquid crystals

2019 ◽  
pp. 315-340 ◽  
Author(s):  
Shoichi Ishihara ◽  
Jovia Jia Lee ◽  
Khai Jun Kek
Keyword(s):  
Liquid Crystals ◽  
Organic Chemicals ◽  
Volatile Organic ◽  
Volatile Organic Chemicals

Dermal absorption of neat and aqueous volatile organic chemicals in the fischer 344 rat

1991 ◽  
Vol 55 (1) ◽  
pp. 51-63 ◽  
Author(s):  
D.L. Morgan ◽  
S.W. Cooper ◽  
D.L. Carlock ◽  
J.J. Sykora ◽  
B. Sutton ◽  
...  
Keyword(s):  
Dermal Absorption ◽  
Organic Chemicals ◽  
Fischer 344 ◽  
Fischer 344 Rat ◽  
Volatile Organic ◽  
Volatile Organic Chemicals

scholarly journals Neem and the Environment

2018 ◽  
Vol 4 (01) ◽  
pp. 01-09
Author(s):  
Rajendra Prasad ◽  
Samendra Prasad
Keyword(s):  
Nitrous Oxide ◽  
Azadirachta Indica ◽  
C Sequestration ◽  
Agricultural Fields ◽  
Organic Chemicals ◽  
N2o Production ◽  
Fertilizer Nitrogen ◽  
Volatile Organic ◽  
Volatile Organic Chemicals ◽  
Surface And Groundwater

Neem ( Juss) can play a key role in C-sequestration, Azadirachta indica reducing nitrous oxide (N2O) production from the agricultural fields, checking desertification and reducing nitrate eutrophication of surface and groundwater due to fertilizer nitrogen. Neem is a shady tree and reduces temperature of the micro environment under it. Neem also contains a large number of volatile organic chemicals (VOCs) that may purify the air around the tree; this is in addition to production of oxygen during the day as most trees and plants do.

scholarly journals Quantitation by Portable Gas Chromatography: Mass Spectrometry of VOCs Associated with Vapor Intrusion

2010 ◽  
Vol 2010 ◽  
pp. 1-6 ◽  
Author(s):  
Justin D. Fair ◽  
William F. Bailey ◽  
Robert A. Felty ◽  
Amy E. Gifford ◽  
Benjamin Shultes ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Analytical Method ◽  
Gas Chromatography Mass Spectrometry ◽  
Organic Chemicals ◽  
Vapor Intrusion ◽  
Reliable Technique ◽  
Precise Identification ◽  
Volatile Organic ◽  
Volatile Organic Chemicals

Development of a robust reliable technique that permits for the rapid quantitation of volatile organic chemicals is an important first step to remediation associated with vapor intrusion. This paper describes the development of an analytical method that allows for the rapid and precise identification and quantitation of halogenated and nonhalogenated contaminants commonly found within the ppbv level at sites where vapor intrusion is a concern.

scholarly journals Atmospheric transport of persistent semi-volatile organic chemicals to the Arctic and cold condensation in the mid-troposphere – Part 2: 3-D modeling of episodic atmospheric transport

2010 ◽  
Vol 10 (15) ◽  
pp. 7315-7324 ◽  
Author(s):  
L. Zhang ◽  
J. Ma ◽  
C. Tian ◽  
Y. Li ◽  
H. Hung
Keyword(s):  
Atmospheric Circulation ◽  
Atmospheric Transport ◽  
The Arctic ◽  
Organic Chemicals ◽  
High Latitudes ◽  
Volatile Organic ◽  
Volatile Organic Chemicals ◽  
Cold Condensation ◽  
Condensation Effect ◽  
Modeling Study

Abstract. Two 3-dimensional global atmospheric transport models for persistent organic pollutants (POPs) have been employed to investigate the association between the large-scale atmospheric motions and poleward transports of persistent semi-volatile organic chemicals (SVOCs). We examine the modeled daily air concentration of α- and γ-hexachlorocyclohexane (HCH) over a period from 1997 through 1999 during which a number of episodic atmospheric transport events were detected in this modeling study. These events provide modeling evidence for improving the interpretation on the cold condensation effect and poleward atmospheric transport of SVOCs in the mid-troposphere. Two episodic transport events of γ-HCH (lindane) to the high Arctic (80–90° N), one from Asian and another from Eurasian sources, are reported in this paper. Both events suggest that the episodic atmospheric transports occurring in the mid-troposphere (e.g. from 3000 m to 5500 m height) are driven by atmospheric horizontal and vertical motions. The association of the transport events with atmospheric circulation is briefly discussed. Strong southerly winds, forced by the evolution of two semi-permanent high pressure systems over mid-high latitudes in the Northern Hemisphere, play an important role in the long-range transport (LRT) of HCHs to the high latitudes from its sources. Being consistent with the cold condensation effect and poleward atmospheric transport in a mean meridional atmospheric circulation simulated by a 2-D atmospheric transport model, as reported by the first part of this study, this modeling study indicates that cold condensation is likely occurring more intensively in the mid-troposphere where rapid declining air temperature results in condensed phase of the chemical over and near its source regions and where stronger winds convey the chemical more rapidly to the polar region during the episodic poleward atmospheric transport events.

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