نتایج جستجو برای: ozone concentration

تعداد نتایج: 399270  

Journal: :Atmosphere 2022

Using Pinus bungeana, Platycladus orientalis, Koelreuteria paniculata and Ginkgo biloba as research objects, three open-top chambers with different ozone-concentration gradients were set up (NF, NF40 NF80) based on trunk sap-flow technology to study the difference in ozone absorption by trees under concentrations. The results showed that monthly diurnal variations of density tree species decrea...

Journal: :Chemosphere 2002
V Grewe C Reithmeier D T Shindell

The importance of the interaction between chemistry and dynamics in the upper troposphere and lower stratosphere for chemical species like ozone is investigated using two chemistry-climate models and a Lagrangian trajectory model. Air parcels from the upper troposphere, i.e. regions of lightning and aircraft emissions, are able to be transported into the lowermost stratosphere (LMS). Trajectory...

1998
I. M. Vardavas J. H. Carver F. W. Taylor

A one-dimensional atmospheric photochemical model with an altitude grid of about 1.5 km was used to examine the structure of the global mean vertical ozone pro®le and its night-time-to-daytime variation in the upper atmosphere. Two distinct ozone layers are predicted, separated by a sharp drop in the ozone concentration near the mesopause. This naturally occurring mesopause ozone deep minimum i...

2015
Heng Zhao Shanshan Wang Wenxin Wang Rui Liu Bin Zhou Aijun Ding

Differential Optical Absorption Spectroscopy (DOAS) was used for the long-term observation of ground-level ozone (O3) from March 2010 to March 2013 over Shanghai, China. The 1-hour average concentration of O3 was 27.2 ± 17.0 ppbv. O3 level increased during spring, reached the peak in late spring and early summer, and then decreased in autumn and finally dropped to the bottom in winter. The high...

Journal: :Chemosphere 2012
Meiping Gao Zequan Zeng Baochang Sun Haikui Zou Jianfeng Chen Lei Shao

The ozonation of synthetic wastewater containing azo dye Acid Red 14 (AR 14) was investigated in a high-throughput microporous tube-in-tube microchannel reactor. The effects of design and operating parameters such as micropore size, annular channel width, liquid volumetric flow rate, ozone-containing gas volumetric flow rate, initial pH of the solution and initial AR 14 concentration on decolor...

Journal: :Blood 1991
K H Wells J Latino J Gavalchin B J Poiesz

A device was designed to deliver a constant source of given concentrations of ozone to fluids containing human immunodeficiency virus type 1 (HIV-1). Ozone was found to inactivate HIV-1 virions in a dose-dependent manner. Greater than 11 log inactivation was achieved within 2 hours at a concentration of 1,200 ppm ozone. Similar concentrations of ozone had minimal effect on factor VIII activity ...

Journal: :Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 2018
Masanori Ando Vasudevanpillai Biju Yasushi Shigeri

Ozone (O3) gas is widely used as a strong oxidizing agent for many purposes, such as the decomposition/removal of organic contaminants and photoresist, and the deodorization/disinfection of air and water. However, ozone is highly toxic to the human body when the air concentration exceeds about 1 ppm. Therefore, there is increasing demand for simple, sensitive, reliable, and cost-effective techn...

Background and purpose: Emerging pollutants such as antibiotics are resistant to biodegradation. The aim of this study was to compare the effect of photocatalytic and Ozonation photolysis on decomposition of Sulfonamide antibiotics (Sulfacetamide, Sulfathiazole, Sulfamethoxazole, and Sulfadiazine) in aquatic environments. Materials and methods: In this study, experiments were conducted discont...

2013
Elena GOTTARDINI Antonella CRISTOFORI Fabiana CRISTOFOLINI Marco FERRETTI

Introduction Because its oxidative power, tropospheric ozone is considered, on a large scale, the most harmful pollutant to vegetation (Ashmore, 2005). The exceedances of critical levels set to protect vegetation are quite high and widespread, so that large parts of crops and forests in Europe are exposed to potentially harmful levels of ozone (EEA, 2009). The impact of ozone on vegetation is t...

2017
S. Dey P. Sibanda S. Gupta A. Chakraborty

The occurrence of high nocturnal surface ozone over a tropical urban area (23̊ 32′16.99′′ N and 87̊ 17′ 38.95′′ E) is analyzed in this paper. Five incidences of nocturnal ozone maxima are recorded during the observational span of two years (June, 2013 to May, 2015). The maximum and minimum values of the surface ozone during these five occasions are 337.630 μg/m3 and 13.034 μg/m3 respectively. HYS...

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