volatile sulfur compounds in the atmosphere

Volatile Organic Compounds in the Nation’s Ground Water and Drinking-Water Supply Wells pdf

Volatile Organic Compounds in the Nation’s Ground Water and Drinking-Water Supply Wells pdf

... restricts the downward movement of water and contaminants to the underlying confined part of the Edwards aquifer, resulting in a smaller VOC occurrence in the confined area than in the unconfined ... understanding the quality of drinking-water supplies including the monitoring of river intakes and production wells of large CWSs, as well as the continued sampling of domestic wells In addition, ... products, and plastics, as well as in the synthesis of other organic compounds VOCs also are used in the dry cleaning of clothing, in refrigeration units, and in the degreasing of equipment and home septic...

Ngày tải lên: 14/03/2014, 19:20

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Chemical evolution of volatile organic compounds in the outflow of the Mexico City Metropolitan area potx

Chemical evolution of volatile organic compounds in the outflow of the Mexico City Metropolitan area potx

... identified as a single point in Fig Point (∼17:00) is an interception of the plume at a lower altitude upon return into the MCMA The higher mixing ratios of MTBE at the beginning and the end of the flights ... further reduction of the boundary layer height in the morning together with some contribution from traffic and industry during the early morning before the boundary layer has expanded During the ... red lines represent latitudes where the C130 intercepted the plume during the 19 March flight At the various latitudes, the OH reactivity is broken down into the reactivity originating from the...

Ngày tải lên: 28/03/2014, 20:20

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Báo cáo hóa học: " Effects of rehydration nutrients on H2S metabolism and formation of volatile sulfur compounds by the wine yeast VL3" docx

Báo cáo hóa học: " Effects of rehydration nutrients on H2S metabolism and formation of volatile sulfur compounds by the wine yeast VL3" docx

... of the genes involved in sulfate assimilation and the synthesis of the sulfur- containing amino acids (Figure 2c) This appears to conflict with our phenotypic observations at the sampling point ... genes were those involved in H S production through the biosynthesis of the sulfur- containing amino acids and the sulfate assimilation pathway (Figure 2c) Addition of DAP, on the other hand, upregulated ... formation during fermentation is well studied, the factors leading to residual H S in the final wine remain to be elucidated Previous studies have pointed out a link between the kinetics of H2S...

Ngày tải lên: 20/06/2014, 23:20

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Chemical events in the atmosphere

Chemical events in the atmosphere

... which contains the papers presented during the Study Week on “Chemical Events in the Atmosphere and their Impact on the Environment” held at the seat of the Academy from the 7th to the 11th of ... present some information about the philosophy, the methodology and the scope o the present meeting, that is, the guidelines f followed by $allthe previous Study Weeks The main object of the Pontifical ... as well as in the laboratory on models, on the causes of acid depositions and on the role of fluorocarbons on the ozone layer and the impact of the COz increase in the atmosphere on the climate...

Ngày tải lên: 16/03/2014, 12:29

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Source Identification of Volatile Organic Compounds in Houston, Texas pdf

Source Identification of Volatile Organic Compounds in Houston, Texas pdf

... noise in mfc Although it is difficult to determine the exact starting and ending points of the noise interval, the selected noise range should be sufficiently long to reflect the noise information ... are presented in Figures 10-14 The plot showing emitter locations was produced by superimposing the wind directional plot (blue area) onto the map where the corresponding emitters in the observed ... corresponds to the wind direction plot for this source The red × at the center of the blue area is the sampling site of the reasons why isoprene and M87 occur in the same source The KD value of...

Ngày tải lên: 22/03/2014, 14:20

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Báo cáo khoa học: First evidence of catalytic mediation by phenolic compounds in the laccase-induced oxidation of lignin models ppt

Báo cáo khoa học: First evidence of catalytic mediation by phenolic compounds in the laccase-induced oxidation of lignin models ppt

... the absorption at the wavelength followed (e.g DA420Æ min)1), in keeping with the literature [9] The complexity of the kinetic trend, i.e a biphasic profile (Fig 3), and the possibility that the ... red, in this case, would remove the H-atom from the OH group of the hindered phenol in an almost thermoneutral step; the resulting 2,4,6tri-t-butylphenoxyl radical drives the reaction towards the ... electrochemical determinations in order to verify whether there was any pH dependence of the Ep of sulfonephthaleins, and, if any, whether it proceeded in the same direction as the pH dependence of the sulfonephthalein...

Ngày tải lên: 23/03/2014, 21:20

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elements and their compounds in the environment occurence analysis and biological relevance

elements and their compounds in the environment occurence analysis and biological relevance

... slightly changed title influencing the length of the whole text, the organization of the introductory and the analytical part as well Subsequently the final working phase started in 2002 This updated ... Important Compounds, and Uses 1116 Inorganic Tin Compounds 1116 Organotin Compounds 1116 Distribution in the Environment, Foods, and Living Organisms 1117 Contamination of the Environment 1117 Inorganic ... 17.6.5.3 Recycling 945 Distribution in the Environment, in Foods, and in Living Organisms 946 Distribution in the Environment 946 Mercury Emissions to the Environment 946 Mercury Species in the Environment...

Ngày tải lên: 03/07/2014, 16:08

1,8K 1,5K 1
báo cáo khoa học: " Bioaccumulation and toxicity of selenium compounds in the green alga Scenedesmus quadricauda" pps

báo cáo khoa học: " Bioaccumulation and toxicity of selenium compounds in the green alga Scenedesmus quadricauda" pps

... which are involved in maintaining the cell redox potential [15] Most of the selenoproteins are found as animal proteins They have not been found in yeast and land plants Surprisingly, they have ... accumulation [33] In Chlorella zofingiensis the accumulation of boiling-stable proteins and the increased activities of the antioxidant enzymes suggested that these compounds were involved in the mechanisms ... of sulfur by selenium in proteins and other sulfur compounds In land plants, Se toxicity is associated with the incorporation of selenocystein (SeCys) and selenomethionine (SeMet) into proteins...

Ngày tải lên: 12/08/2014, 03:20

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Pesticides in the AtmosphereDistribution, Trends, and Governing Factors - Chapter 1 doc

Pesticides in the AtmosphereDistribution, Trends, and Governing Factors - Chapter 1 doc

... most of the published studies that have investigated the occurrences and behavior of pesticides in the atmosphere; synthesized the varied information from these studies to characterize the common ... and understanding of pesticides in the water resources of the United States and of the principal factors that influence contamination and transport The series is presented according to major components ... literature searches, obtaining many of the references, and assisting in many other ways during the research and writing phase of this book Naomi Nakagaki produced many of the maps and patiently...

Ngày tải lên: 12/08/2014, 05:21

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Pesticides in the AtmosphereDistribution, Trends, and Governing Factors - Chapter 2 pdf

Pesticides in the AtmosphereDistribution, Trends, and Governing Factors - Chapter 2 pdf

... their use greatly restricted in the United States During the 1970ts, the organophosphorus and triazine classes were moderately studied in air and precipitation The 1980's showed an increase in ... focus of the studies done on and around the Great Lakes while atrazine and several other corn herbicides were the main focus in the Midwest and Northeast A wider variety of pesticides, including organophosphorus ... of the samples contained 2,4-D The most frequently found ester was the butyl The higher volatile esters were found in the highest concentrations and the highest proportions in air Grover and others,...

Ngày tải lên: 12/08/2014, 05:21

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Pesticides in the AtmosphereDistribution, Trends, and Governing Factors - Chapter 4 pps

Pesticides in the AtmosphereDistribution, Trends, and Governing Factors - Chapter 4 pps

... pollutants (on the range of tens of kilometers) is confined to the environment surrounding the application area if they remain contained in the surface boundary layer (the lower troposphere) If they are ... atmosphere; and The diurnal cycles of the surface boundary layer during which parcels of air may penetrate the capping inversion layer entrained in thermal plumes during the day, or which may remain aloft ... exists near the surface, with a nearly isothermal section forming the bulk of the layer, indicating that it is well mixed by turbulence The slope of the potential temperature profile in the mixed...

Ngày tải lên: 12/08/2014, 05:21

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Pesticides in the AtmosphereDistribution, Trends, and Governing Factors - Chapter 5 pdf

Pesticides in the AtmosphereDistribution, Trends, and Governing Factors - Chapter 5 pdf

... detected in any sample Considering the very high use of these pesticides in Iowa, this finding was unexpected and not explained One of the main findings of this study was that, while each sampling ... and intensity of solar energy reaching the lower atmosphere and the surface of the earth The intensity increases with the clarity of the atmosphere, time of day, and altitude As an example, the ... the area (Tanabe and others, 1982), and the use of organochlorine pesticides such as HCH and DDT remains high in some areas of the world The concentration distribution of these compounds in the...

Ngày tải lên: 12/08/2014, 05:21

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Pesticides in the AtmosphereDistribution, Trends, and Governing Factors - Chapter 7 doc

Pesticides in the AtmosphereDistribution, Trends, and Governing Factors - Chapter 7 doc

... for in the atmosphere at 10 or more sites in the United States, along with the range of concentrations and matrix in which they were detected Only 25 percent of the pesticides analyzed for in the ... values for drinking water There are several instances, though, where the concentrations in rain have exceeded the MCL values These have occurred for alachlor, atrazine, and 2,4-D Cyanazine, 2,4-D, ... atrazine has been detected in several samples near the long-term exposure limit for children In general, the very high concentrations measured in rain occurred infrequently They occurred in or...

Ngày tải lên: 12/08/2014, 05:21

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Báo cáo y học: " Exhaled volatile organic compounds in patients with non-small cell lung cancer: cross sectional and nested short-term follow-up study" pptx

Báo cáo y học: " Exhaled volatile organic compounds in patients with non-small cell lung cancer: cross sectional and nested short-term follow-up study" pptx

... 19% The total explained variance of the model was therefore 66.5% In order to test the discriminant power of the exhaled VOC pattern, a multinomial logistic regression was made using the coding ... identifying biomarkers of early lung cancer probably require the use of a panel rather than single substances [17] The main finding of our study was that none of selected VOCs alone distinguished the ... [20]; furthermore, it allowed us to measure most of the substances of interest proposed in the literature Another reason for the difference in VOC identification may be the different clinical characteristics...

Ngày tải lên: 12/08/2014, 18:21

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A Modified Phenylfluorone Method for Determining Organotin Compounds in the ppb and Subppb Range

A Modified Phenylfluorone Method for Determining Organotin Compounds in the ppb and Subppb Range

... enhancement of the color development The Slope of the Lines The slope of the line, calculated by the method of least squares, for the inorganic tin standards was 0.0346 and the intercept was 0.0144 The ... Although the percent of recovered tin varied randomly from one sample to the next, the average for the two sets of samples indicates that inorganic tin is not extracted with the organotin and that there ... were used in preparing the two curves Furthermore, only unmatched X cmcells wereavailable in preparing the O T C curve whereas matched X 10 mm cells were available in preparing the inorganic...

Ngày tải lên: 06/10/2015, 20:19

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Screening of mycosporine   like compounds in the dermatocarpon genus  phytochemical study of the lichen dermatocarpon luridum (with ) j r  laundon

Screening of mycosporine like compounds in the dermatocarpon genus phytochemical study of the lichen dermatocarpon luridum (with ) j r laundon

... glycine and mycosporine taurine are oxo-mycosporines), MAAs from marine organisms are imine derivatives of mycosporines which contain a cyclohexenimine ring (imino-mycosporine) linked to an amino ... and imino-mycosporines In our study, the use of mycosporine-like compounds is preferred to mycosporines and MAAs as these terms imply to know the origin of the molecules Mycosporine-like compounds ... xxviii Introduction Over the past ten years, the team involved in natural products research in Rennes has a special interest in lichens These symbiotic organisms are classified in the fungi kindom...

Ngày tải lên: 20/05/2016, 16:03

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RESEARCH ON THE CHANGE OF 2-AP AND OTHER VOLATILE COMPOUNDS IN PROCESSING BUN FROM RICE

RESEARCH ON THE CHANGE OF 2-AP AND OTHER VOLATILE COMPOUNDS IN PROCESSING BUN FROM RICE

... at the Rt 9.678 minute 734 Research on the Change of 2-AP and Other Volatile Compounds in Processing Bun from Rice 3.4 Investigating the changes of 2-AP and other volatile compounds of rice in ... 3°C/min then from115°C to 220°C at 30°C/min and finally maintained at 220◦C for The detector port was maintained at 2500C Concentration of 2-AP in samples s is identified and quantified in the ... collidine was added as an internal standard The solution was equilibrated at 80°C for minutes then the fiber was introduced in the headspace surrounding rice at the same temperature for 15 minutes...

Ngày tải lên: 28/08/2013, 16:28

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BÁO CÁO "RESEARCH ON THE CHANGE OF 2-AP AND OTHER VOLATILE COMPOUNDS IN PROCESSING BUN FROM RICE" doc

BÁO CÁO "RESEARCH ON THE CHANGE OF 2-AP AND OTHER VOLATILE COMPOUNDS IN PROCESSING BUN FROM RICE" doc

... at the Rt 9.678 minute 734 Research on the Change of 2-AP and Other Volatile Compounds in Processing Bun from Rice 3.4 Investigating the changes of 2-AP and other volatile compounds of rice in ... 3°C/min then from115°C to 220°C at 30°C/min and finally maintained at 220◦C for The detector port was maintained at 2500C Concentration of 2-AP in samples s is identified and quantified in the ... collidine was added as an internal standard The solution was equilibrated at 80°C for minutes then the fiber was introduced in the headspace surrounding rice at the same temperature for 15 minutes...

Ngày tải lên: 19/03/2014, 16:20

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