scholarly journals HPLC Fingerprints of Porewater Organic Compounds as Markers for Environmental Conditions

10.5772/27195 ◽  
2012 ◽  
Author(s):  
Viia Lepane
Keyword(s):  
Organic Compounds ◽  
Environmental Conditions

Impacts of environmental conditions on the sorption of volatile organic compounds onto tire powder

2008 ◽  
Vol 153 (1-2) ◽  
pp. 157-163 ◽  
Author(s):  
Dong I. Oh ◽  
Kyongphile Nam ◽  
Jae W. Park ◽  
Jee H. Khim ◽  
Yong K. Kim ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Environmental Conditions ◽  
Volatile Organic

scholarly journals Development of Ozone Reactivity Scales for Volatile Organic Compounds in a Chinese Megacity

2021 ◽  
Author(s):  
Yingnan Zhang ◽  
Likun Xue ◽  
William P. L. Carter ◽  
Chenglei Pei ◽  
Tianshu Chen ◽  
...  
Keyword(s):  
Air Pollution ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Environmental Conditions ◽  
Strong Dependence ◽  
Chemical Mechanism ◽  
Emission Data ◽  
Similar Chemical ◽  
Volatile Organic ◽  
The U.S

Abstract. We developed incremental reactivity (IR) scales for 116 volatile organic compounds (VOCs) in a Chinese megacity (Guangzhou) and elucidated their application in calculating the ozone (O3) formation potential (OFP) in China. Two sets of model inputs (emission-based and observation-based) were designed to localize the IR scales in Guangzhou using the Master Chemical Mechanism (MCM) box model, and were also compared with those of the U.S. The two inputs differed in how primary pollutant inputs in the model were derived, with one based on emission data and the other based on observed pollutant levels, but the maximum incremental reactivity (MIR) scales derived from them were fairly similar. The IR scales showed a strong dependence on the chemical mechanism (MCM vs. Statewide Air Pollution Research Center), but the discrepancy between China and the U.S. using a similar chemical mechanism was not large. With a given chemical mechanism, the MIR scale for most VOCs showed a relatively small dependence on environmental conditions. However, when the NOx availability decreased, the IR scales became more sensitive to environmental conditions and the discrepancy between the IR scales obtained from emission-based and observation-based inputs increased, thereby implying the necessity to localize IR scales over mixed-limited or NOx-limited areas. This study provides recommendations for the application of IR scales, which has great significance for VOC control in China and other countries suffering from serious O3 air pollution.

scholarly journals Development of ozone reactivity scales for volatile organic compounds in a Chinese megacity

2021 ◽  
Vol 21 (14) ◽  
pp. 11053-11068
Author(s):  
Yingnan Zhang ◽  
Likun Xue ◽  
William P. L. Carter ◽  
Chenglei Pei ◽  
Tianshu Chen ◽  
...  
Keyword(s):  
Air Pollution ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Environmental Conditions ◽  
Strong Dependence ◽  
Chemical Mechanism ◽  
Emission Data ◽  
Similar Chemical ◽  
The Us ◽  
Volatile Organic

Abstract. We developed incremental reactivity (IR) scales for 116 volatile organic compounds (VOCs) in a Chinese megacity (Guangzhou) and elucidated their application in calculating the ozone (O3) formation potential (OFP) in China. Two sets of model inputs (emission-based and observation-based) were designed to localize the IR scales in Guangzhou using the Master Chemical Mechanism (MCM) box model and were also compared with those of the US. The two inputs differed in how primary pollutant inputs in the model were derived, with one based on emission data and the other based on observed pollutant levels, but the maximum incremental reactivity (MIR) scales derived from them were fairly similar. The IR scales showed a strong dependence on the chemical mechanism (MCM vs. Statewide Air Pollution Research Center), and a higher consistency was found in IR scales between China and the US using a similar chemical mechanism. With a given chemical mechanism, the MIR scale for most VOCs showed a relatively small dependence on environmental conditions. However, when the NOx availability decreased, the IR scales became more sensitive to environmental conditions and the discrepancy between the IR scales obtained from emission-based and observation-based inputs increased, thereby implying the necessity to localize IR scales over mixed-limited or NOx-limited areas. This study provides recommendations for the application of IR scales, which has great significance for VOC control in China and other countries suffering from serious O3 air pollution.

Indoor environmental conditions in schoolchildren’s homes in central-south China

2019 ◽  
Vol 29 (7) ◽  
pp. 956-971
Author(s):  
Jinhua Hu ◽  
Nianping Li ◽  
Shenghua Zou ◽  
Hiroshi Yoshino ◽  
U Yanagi ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
South China ◽  
Environmental Conditions ◽  
Public Awareness ◽  
National Standard ◽  
Primary School Children ◽  
Significant Difference ◽  
Volatile Organic ◽  
Central South

A field investigation on indoor environmental conditions was performed in homes with primary school children in Changsha, a city located in central-south China. The main purpose is to obtain more reliable and comprehensive data relating to the health of children. The results showed that the average temperature, relative humidity and carbon dioxide concentration in October were 20.4°C, 56.7% and 398 ppm, while in January were 10.5°C, 55% and 475 ppm, respectively. The monitored PM2.5 concentrations were greater than the Chinese national standard GB 3095–2012 (75 μg/m3), with a significant difference found between October and January ( p <  0.05). Carbonyl compounds were much lower than the corresponding specified limits. However, total volatile organic compounds (TVOCs) in some homes in January exceeded the Chinese standard GB/T 18883–2002 (600 μg/m3). The most common constituents of semi-volatile organic compounds in house dusts were di(2-ethylhexyl) phthalate and dibutyl phthalate. Furthermore, Cladosporium, Penicillium and Aspergillus were all found in indoor air and house dusts. Children’s daily intake of formaldehyde, acetaldehyde and TVOC were primary from their bedrooms rather than living rooms ( p <  0.05). These results would contribute to the public awareness of indoor environmental conditions and possible impacts on school-age children in their homes.

scholarly journals Volatile organic compounds (VOC) variation in Croton floribundus (L.) Spreng. related to environmental conditions and ozone concentration in an urban forest of the city of São Paulo, São Paulo State, Brazil

Hoehnea ◽  
2018 ◽  
Vol 45 (2) ◽  
pp. 184-191 ◽  
Author(s):  
Vanessa Palermo Bolsoni ◽  
Débora Pinheiro de Oliveira ◽  
Giselle da Silva Pedrosa ◽  
Silvia Ribeiro de Souza
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Environmental Conditions ◽  
Urban Forest ◽  
Sao Paulo ◽  
São Paulo ◽  
Paulo State ◽  
Volatile Organic ◽  
São Paulo State ◽  
Ozone Levels

ABSTRACT Volatile organic compounds (VOC) are emitted by vegetation in response to different kinds of stress, such as herbivory, environmental conditions and air pollutants. The aim of this study was to identify the VOC emitted by seedlings of Croton floribundus (L.) Spreng. exposed to a polluted environment and analyze the relationship among classes of compounds emitted, ozone levels and changes in climate conditions. Two exposures were carried out, one in winter (June to August 2012) and another in summer (January to April 2013), in the Parque Estadual das Fontes do Ipiranga, city of São Paulo, São Paulo State, Brazil. We identified 26 compounds that are grouped into oxygenates, aromatics, monoterpenes and sesquiterpenes. The emission of sesquiterpenes was inhibited in summer, while those of the oxygenated and aromatic compounds were induced. The emission of volatiles was correlated to ozone levels (AOT 40). Our results suggest that the levels of atmospheric ozone detected in the summer can increase the induction of oxygenates and reduce the emission of monoterpenes in C. floribundus plants.

The Tempo and mode(S) of Prebiotic Evolution

1997 ◽  
Vol 161 ◽  
pp. 419-429 ◽  
Author(s):  
Antonio Lazcano
Keyword(s):  
Origin Of Life ◽  
Organic Compounds ◽  
Biological Evolution ◽  
Current Evidence ◽  
Early Diversification ◽  
Time Period ◽  
The Galaxy ◽  
History Of ◽  
Widespread Phenomenon ◽  
The Origin Of Life

AbstractDifferent current ideas on the origin of life are critically examined. Comparison of the now fashionable FeS/H2S pyrite-based autotrophic theory of the origin of life with the heterotrophic viewpoint suggest that the later is still the most fertile explanation for the emergence of life. However, the theory of chemical evolution and heterotrophic origins of life requires major updating, which should include the abandonment of the idea that the appearance of life was a slow process involving billions of years. Stability of organic compounds and the genetics of bacteria suggest that the origin and early diversification of life took place in a time period of the order of 10 million years. Current evidence suggest that the abiotic synthesis of organic compounds may be a widespread phenomenon in the Galaxy and may have a deterministic nature. However, the history of the biosphere does not exhibits any obvious trend towards greater complexity or «higher» forms of life. Therefore, the role of contingency in biological evolution should not be understimated in the discussions of the possibilities of life in the Universe.

Sign in / Sign up

Export Citation Format

Share Document