exposure to volatile organic compounds

EXPOSURE ANALYSIS -CHAPTER 7 pdf

Ngày tải lên : 12/08/2014, 00:21

... (1990) Total Exposure to Volatile Organic Compounds in Potable Water, in Signiﬁcance and Treatment of Volatile Organic Compounds in Water Supplies, Ram, N.M., Christman, R.F., and Cantor, K.P., ... sampling with HPLC analysis Adsorbent cartridge sampling with HPLC analysis TO- 6 TO- 7 TO- 8 TO- 11A TO- 12 TO- 14A TO- 15 TO- 16 TO- 17 Cryogenic preconcentration and ﬂame ionization detection (FID) Evacuated, ... Group, LLC Exposure to Volatile Organic Compounds 149 TABLE 7.1 Common Volatile Organic Chemicals and Their Sources Chemicals Acetone Alcohols (ethanol, isopropanol) Aromatic hydrocarbons (toluene,...

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Tài liệu Glossary of Volatile Organic Compounds ppt

Ngày tải lên : 14/02/2014, 03:20

... underground storage tanks at gasoline stations and other facilities Toluene does not concentrate or build up to high levels in animals or humans Route of exposure People can be exposed to toluene ... Return to menu Toluene Toluene is clear, colorless liquid that occurs naturally in crude oil and in the tolu tree It is produced in the process of making gasoline and other fuels from crude oil Toluene ... Chronic abuse of toluene can cause problems with the central nervous system Studies in workers and in animals exposed to toluene show that toluene does not cause cancer Measuring exposure In a large...

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

Ngày tải lên : 14/03/2014, 19:20

... laboratory reporting level for that compound (21) Laboratory reporting levels for VOCs may vary from compound to compound and from one laboratory to another due to differences in laboratory equipment, ... (source factors), depth to top of well screen (transport factor), and presence of dissolved oxygen (fate factor) National-scale statistical analyses provide important insights about the factors that ... of 55 volatile organic compounds (VOCs) in ground water gives emphasis to the occurrence of VOCs in aquifers that are used as an important supply of drinking water In contrast to the monitoring...

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DETERMINATION OF VOLATILE ORGANIC COMPOUNDS (VOC) IN CONSUMER PRODUCTS AND REACTIVE ORGANIC COMPOUNDS IN AEROSOL COATING PRODUCTS doc

Ngày tải lên : 14/03/2014, 20:20

... DETERMINATION OF VOLATILE ORGANIC COMPOUNDS (VOC) IN CONSUMER PRODUCTS AND REACTIVE ORGANIC COMPOUNDS IN AEROSOL COATING PRODUCTS APPLICABILITY 1.1 This method (Method 310) applies to the determination ... 100 Where: V = weight fraction of non-exempted volatile organic compounds in the non-propellant portion n = number of non-exempted volatile organic compounds in the non-propellant portion WL = ... specific product category (“exempt compounds ) are subtracted from the total volatile material to determine the final VOC content for the product Method 310 is also used to determine the percent by...

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Source Identification of Volatile Organic Compounds in Houston, Texas pdf

Ngày tải lên : 22/03/2014, 14:20

... linear terms As an optimization method for factor analysis, ME has two problems to be solved, that is, how to determine the number of factors and how to avoid local optimal In the section of Results ... zip can correspond to different expressions In this study, zip corresponds to the factors for wind speed, wind direction, temperature, and weekday/ weekend The expanded receptor model can then ... the PTR-MS is the reaction of organic species in ambient air with H3O+ ions, generated from the hollow cathode discharge of water vapor, to produce the protonated organic species (RH+) The concentration...

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Total Volatile Organic Compounds (WOC) in Indoor Air Quality Investigations doc

Ngày tải lên : 28/03/2014, 19:20

... Description Abbreviation Very volatile (gaseous) organic compounds VVOC Volatile organic compounds VOC organic compounds associated with particulate matter or particulate organic Boiling-point range* ... relation to sensory irritation due to volatile organic compounds ASHRAE Trans., 92 (I), 1-12 Mprlhave, L., Bach, B and Pedersen, O.F., 1986 Human reactions to low concentrations of volatile organic compounds ... Neurotoxicol Teratol., 12,649-652 Otto, D.A., Hudnell, H.K., Goldstein, G and O'Neil, J., 1990b Indoor air - Health Neurotoxic effects of controlled exposure to a complex mixture of volatile organic...

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

Ngày tải lên : 28/03/2014, 20:20

... York York York York York York York York PNNL PNNL York York York York PNNL DFGAS TOGA TOGA TOGA TOGA TOGA TOGA TOGA TOGA NCAR UCI IMK-IFU Texas A&M IMK-IFU NOAA PNNL Texas A&M NOAA PNNL Texas A&M ... prevalent ketones, acetone and methyl ethyl ketone, are believed to have primary sources similar to the aromatic compounds but with a higher fraction of emissions from paints and solvents compared to ... 2353–2376, 2010 2362 E C Apel et al.: Chemical evolution of volatile organic compounds Fig The top 20 compounds measured at T0 (top panel) and T1 (bottom panel) in terms of OH reactivity between 09:00...

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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

Ngày tải lên : 12/08/2014, 18:21

... Respiratory Research 2005, 6:71 Background Breath analysis seems to be a promising approach to identify new biomarkers of inflammatory and oxidative lung processes, and different volatile organic compounds ... confounding factors mainly related to tobacco smoke Isoprene, pentane and 2-methylpentane are grouped together (group 1, factor 3) These substances can be considered mainly endogenous compounds even ... breath analysis – focus on volatile organic compounds Clin Chim Acta 2004, 347:25-39 Imbriani M, Ghittori S: Gases and organic solvents in urine as biomarkers of occupational exposure: a review Int...

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CÁC CÔNG NGHỆ XỬ LÝ H2S VÀ VOC (VOLATILE ORGANIC COMPOUNDS) TRONG KHÍ THẢI

Ngày tải lên : 12/04/2015, 14:24

... liên tục khối vật liệu hấp thụ cách bổ sung vào dòng khí cần xử lí thể tích không khí với tính to n cho lượng oxy trong hỗn hợp khí gấp 1,5 lần lượng oxy lý thuyết cần cho trình oxy hóa Như trình...

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Perinatal exposure to persistant organic pollutants implications for human health

Ngày tải lên : 14/09/2015, 14:06

... intrauterine exposure to POPs and the newborn birth outcome (Chapter 6); • To assess the potential risks of postnatal exposure to POPs on infants’ health via breastfeeding, and to explore the factors ... Influential factors on TPT of POPs 85 5.3.4 The placenta: a surrogate for prenatal exposure assessment? 87 5.4 CONCLUSIONS 89 CHAPTER EXPOSURE TO PERSISTENT ORGANIC POLLUTANTS ... system (Brown et al., 1994; Hakk and Letcher, 2003) 2.3 2.3.1 Human Exposure to POPs Exposure pathways The exposure pathways to POPs for humans include food and water intake, dermal absorption,...

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Optical Fiber Sensors to Detect Volatile Organic Compound in Sick Build- ing Syndrome Applications potx

Ngày tải lên : 14/03/2014, 20:20

... sensing system only needs to install the fiber, and it is not necessary any treatment to make it sensitive to the gas to detect This sensing architecture is related to spectrography: the wavelength ... NH3[47] CONCLUSIONS SBS is a health issue that has to be taken into account both in work and house buildings It is due not only to a single factor, but to a global effect of physical conditions, air ... the sensing area to the end, and then, when the signal travels back from the mirror to the detector, passing again through the modified cladding area [42] It is also possible to use a bent evanescent...

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EVALUATING EXPOSURE RISK TO TRACE ORGANIC CHEMICALS IN BIOSOLIDS pdf

Ngày tải lên : 28/03/2014, 20:20

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báo cáo hóa học: " A case study on co-exposure to a mixture of organic solvents in a Tunisian adhesive-producing company" potx

Ngày tải lên : 20/06/2014, 00:20

... neuropsychiatry symptoms associated with chronic exposure to organic solvents have been described for a long time The effects of chronic and sub-chronic exposure to these studied organic solvents ... solvents are acetone, cyclohexane, n-hexane, methylethylketone, toluene and trichloroethylene The investigation aimed to assess occupational exposure of the company volunteer’s workers to a mixture ... workers exposed to a mixture of organic solvents Neurotoxicology 2003, 24:703-710 22 Grandjean P, Budtz-Jørgensen E: Total imprecision of exposure biomarkers: Implication for calculating exposure limites...

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Estimation of emissions of nonmethane organic compounds from a closed landfill site using a landfill gas emission model

Ngày tải lên : 05/09/2013, 16:11

... the fact that volatile organic compounds (VOCs), a major group of NMOC are recognised to be highly carcinogenic even in low concentration [16]; are the main reasons nonmethane organic compound ... gases, there is, therefore, often a requirement to monitor the migration of these gases to ensure the safety of both in-situ and ex-situ structures, and to ensure the safety and protection of personnel ... serves to carry with it nonmethane organic compounds (NMOCs) that were originally present in the municipal solid waste [5] In the United States for example, MSW landfills were estimated to release...

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Tài liệu Male Reproductive Health Disorders and the Potential Role of Exposure to Environmental Chemicals pdf

Ngày tải lên : 13/02/2014, 10:20

... pregnancy exposure to phthalates and AGD, cryptorchidism and hypospadias – are paramount Ideally, these should also take into account exposures to other similarly acting (anti-androgenic) compounds, ... linked to an outcome disorder(s) There are huge practical and ethical obstacles to being able to this definitively, and this has to be taken into account (Table 1, p25) In particular, linking EC exposure ... his/her exposure to environmental and lifestyle factors is what determines whether or not disease will occur This applies also to male reproductive health disorders, and has to be taken into account...

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Tài liệu ADSORPTION OF ORGANIC COMPOUNDS doc

Ngày tải lên : 14/02/2014, 03:20

... of to mg/L and typical threshold odor numbers (TONs) of to 15 with spikes of 40 to 60 The effluent goal was a TON of ADSORPTION OF ORGANIC COMPOUNDS 13.37 (a) TON Breakthrough Curves (b) TON ... 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 concentration ... of ft appeared to be too short to effectively reduce TON Figure 13.21b shows the progression of the TON mass transfer zone through the GAC bed After 18 days of operation, the TON reached a value...

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Tài liệu Human-induced changes in US biogenic volatile organic compound emissions: evidence from long-term forest inventory data ppt

Ngày tải lên : 14/02/2014, 08:20

... wood volume) The aerial photographic data enable these characteristics to be scaled up to the regional level, by calculating the fraction of the land surface belonging to each of the different ... canopies to interdigitate, and run the canopy model with a mixed canopy of different species or (B) reduce canopy sizes to keep Cðj;tÞ below or equal to 1.0 Method A would be difﬁcult to implement ... methodology is close to that used to estimate actual emissions for forest stand canopies in the BEIS-2 model (Pierce et al., 1998) ð5Þ LAI was then calculated as the ratio of total leaf area to crown area...

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Tài liệu NOMENCLATURE OF ORGANIC COMPOUNDS docx

Ngày tải lên : 14/02/2014, 08:20

... double bonded to another carbon atom will be bonded to one carbon atom and one hydrogen atom A carbon atom on the end of a chain that is triple bonded to another carbon atom will be bonded to one hydrogen ... single bonded carbon atoms will be bonded to one hydrogen A carbon atom on the end of a chain that is double bonded to another carbon atom be bonded to two hydrogen atoms A carbon atom in the middle ...  A carbon atom in the middle of a chain of single bonded carbon atoms will be bonded to two carbon atoms and two hydrogen atoms H    CCC    C  A carbon atom bonded to other single...

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Tài liệu METHOD 21 - DETERMINATION OF VOLATILE ORGANIC COMPOUND LEAKS doc

Ngày tải lên : 14/02/2014, 08:20

... Supplies A VOC monitoring instrument meeting the following specifications is required: 6.1 The VOC instrument detector shall respond to the compounds being processed Detector types that may meet ... method to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to performing this test method 5.2 Hazardous Pollutants Several of the compounds, ... readable to ±2.5 percent of the specified leak definition concentration 6.4 The instrument shall be equipped with an electrically driven pump to ensure that a sample is provided to the detector at...

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Tài liệu Exposure to Artificial UV Radiation and Skin Cancer ppt

Ngày tải lên : 14/02/2014, 21:20

... questionnaire to document exposure habits to artificial UV radiation sources One study was conducted in North Carolina (USA) to assess adherence of indoor tanning clients to FDA-recommended exposure ... location and latitude of the region; Exposure information: definition of type of exposure, age at first exposure, duration of exposure, year of exposure, place of exposure; Case–control information: ... according to specific exposure category The minimal common information about exposure to indoor tanning devices for all studies was "ever exposed" For those studies where the definition of exposure...

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