as 400 organic compounds

Ngày tải lên: 05/09/2013, 16:11

... environment as a result of its use in moth-repellant products and in toilet-deodorizer blocks. Because it changes from a solid to a gas easily, almost all 1,4-dichlorobenzene produced is released ... tetrachloride was widely used as a cleaning fluid, in industry and dry cleaning businesses, and in the household. Carbon tetrachloride also was used in fire extinguishers and as a fumigant ... are found in air, water, and soil because of past and present releases. Most carbon tetrachloride that escapes to the environment is found as a gas in the atmosphere. It is not expected to build...

Ngày tải lên: 14/02/2014, 03:20

... of spent gas-phase GAC was not feasible. This advantage results because the natural organics that interfere with adsorption from the aqueous phase are not present in the stripper off-gas. Symons ... parameters such as total organic carbon (TOC), dissolved organic carbon (DOC), chemical oxygen demand (COD),dissolved organic halogen (DOX),UV absorbance, and fluorescence as a measure of the total ... adsorber life decreases as influent concentration increases and as the required effluent concen- tration decreases. Each water that is treated will have different background organic matter; thus,...

Ngày tải lên: 14/02/2014, 03:20

... chemistry of carbon compounds. Carbon has the ability to bond with itself to form long chains and, as a result, millions of compounds from simple hydrocarbons to large biomolecules such as proteins, ... compounds, their structures and names is listed in tables on the next two pages. 1 NOMENCLATURE OF ORGANIC COMPOUNDS ©2010, 2003, 1980, by David A. Katz. All rights reserved. Organic ... nucleic acids. Originally it was believed that these compounds had to come from a living organism, now they are synthesized in the laboratory. The simplest organic compounds are composed of carbon...

Ngày tải lên: 14/02/2014, 08:20

... plant, are organic compounds. •Most fuels are organic compounds (wood, coal, natural gas, gasoline, kerosene, diesel fuel, oil, and other petroleum-based products). • Complex organic compounds ... than 16,000,000 organic compounds are known, as opposed to about 600,000 inorganic compounds. 12 What What ’ ’ s So Great About Carbon? s So Great About Carbon? • Complex organic compounds can ... University www.angelo.edu/faculty/kboudrea CHEM 2353 Fundamentals of Organic Chemistry CHEM 2353 Fundamentals of Organic Chemistry Organic Compounds: Organic Compounds: Alkanes Alkanes Organic and Biochemistry for Today (4 th ed.) Spencer...

Ngày tải lên: 14/03/2014, 19:20

... chloroform) was associated with oxic conditions and public wells. Bromodichloromethane was detected more frequently in areas with low ground-water recharge and in areas with sewer systems. In contrast, ... of commercial gasoline release sites and the imple- mentation of measures to minimize gasoline releases in the future. Despite these exemplary accomplishments, environmental releases of some VOCs ... 13 Chapter 2 As noted previously, 55 VOCs were included in this assessment. These VOCs were assigned to the following groups on the basis of their primary usage (or origin): (1) fumigants, (2) gasoline...

Ngày tải lên: 14/03/2014, 19:20

... Method SW-846 Method 8270D, ASTM D 5443-04, ASTM D 3257, ASTM D 3710- 95, ASTM D3606-07, ASTM D 5580-02. 3.4 Prohibited Compounds If the sample is found to contain compounds prohibited by ARB ... unknown, the following ASTM methods may be used to determine the LVP-VOC status of compounds and mixtures: ASTM D 86-01, ASTM D 850-00, ASTM D 1078-01, ASTM D 2879-97, as modified in Appendix ... pressure-volatile organic compounds (LVP-VOC) as that term is defined in section 94508(a), and (3) the reactive organic compounds (ROC) contained in aerosol coating products, as that term is...

Ngày tải lên: 14/03/2014, 20:20

... disks is 525.2-22 areas measured in the most recent continuing calibration check, or by more than 50% from the areas measured during initial calibration. If these areas have decreased by more than ... Carrier Gas As contaminant free as possible. 7.2 Liquid-Solid Extraction (LSE) Cartridges Cartridges are inert non-leaching plastic, for example polypropylene, or glass, and must not contain plasticizers, such ... laboratory procedures. Analyses of FD1 and FD2 give a measure of the precision associated with sample collection, preservation, and storage, as well as with laboratory procedures. 3.5 Laboratory Reagent...

Ngày tải lên: 22/03/2014, 14:20

... dyes was as high as 2 pK a units [18]. The IUPAC reported RMS interlaboratory deviation between observed values of pK a for azo dyes, where more than one measurement was reported was 0.64 ... titration curve and speciation fractions as a function of the pH, 2. ionization pK a in the gas phase, 3. ionization pK a in non-aqueous solution, 4. gas phase electron affinity, 5. carboxylic ... subclass of molecules. A more aggressive attempt was made by Klopman et. al., [37, 38]. They estimated the pK a 's for about 2400 molecules (R 2 = 0.846) based on QSAR using the Multi- CASE...

Ngày tải lên: 22/03/2014, 14:20

... factor valuesdecrease with increasing wind speed. This trend suggests a dilution effect that the same emitted mass is released into a larger volume of air as wind speed increases; the concentration therefore ... other compounds such as vinyl acetate and c13-benzenes. Such behavior typically suggested that there was a high variability in the amounts of methanol associated with its sources. In this case, ... / VOL. 38, NO. 5, 2004 the candidate cases had at least three runs to avoid local optima, andfinally thecase of 9sources (excludingmethanol) was selected as the best solution. The results are...

Ngày tải lên: 22/03/2014, 14:20

... 1. Classzjication of indoor organic pollutants (WHO, 1989) Category Description Abbreviation Very volatile VVOC (gaseous) organic compounds Volatile organic VOC compounds organic compounds ... the measurement refers to how well it measures what it is intended to measure. There are several kinds of validity. Empirical validity is defined as the degree of association between the measurement ... ISBN 92-828-1 078-X The amount of volatile organic compounds (VOCs) in indoor air, usually called TVOC (Jotal volatile organic compounds) , has been measured using different definitions and techniques...

Ngày tải lên: 28/03/2014, 19:20

Ngày tải lên: 28/03/2014, 20:20

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Ngày tải lên: 01/04/2014, 10:53

Ngày tải lên: 02/04/2014, 16:00

Ngày tải lên: 16/04/2014, 11:20

... Determination of phosphoric acid trimesters in human plasma using solid-phase microextraction and gas chromatography coupled to inductively coupled plasma mass spectrometry. J Chromatography 1103:329- 336. ... known toxicological effects. SCCPs are used primarily as in metal-working fluids but they are also used as flame retardants (as well as plasticizers and in paints and sealants). SCCPs have been ... Chlorinated Organic Chemical Compounds used as Flame Retardants 2,2-Bis(bromomethyl)-1,3-propanediol [CAS No. 3296-90-0] 2,2-Bis(chloromethyl)trimethylene bis[bis(2-chloroethyl)phosphate] [CAS...

Ngày tải lên: 05/03/2014, 20:20

Ngày tải lên: 21/06/2014, 17:20

Ngày tải lên: 05/09/2013, 09:38