usepa s guidance for use in fish advisories

... FORENSICS OF DUST Since as early as the late 180 0s, scientists have used forensic microscopy in crime detection Pollen typing has been used to determine the source areas for illegal shipments ... exposures for insect infestations Some examples may be found in Table 15.4 Table 15.4 Occupational Exposures to Insects Entomologists: locusts, crickets, flies Grain mill workers: beetles, grain ... MINERALS Soils Amorphous versus crystalline OTHERS Soot and ash Metal fumes Paint Explosives Pharmaceuticals Drugs Excerpted from Forensic Microscopy.4 and body surfaces They bring components...

Ngày tải lên: 11/08/2014, 07:20

... levels can cause unconsciousness, low blood pressure, and loss of heartbeat In some animals, exposure to high levels damages the breathing passages, affects the nervous system, and causes mild ... tetrachloride is being phased out In the past, carbon tetrachloride was widely used as a cleaning fluid, in industry and dry cleaning businesses, and in the household Carbon tetrachloride also was used in ... is produced in the process of making gasoline and other fuels from crude oil Toluene is also used in making paints, paint thinners, fingernail polish, lacquers, adhesives, and rubber, and in some...

Ngày tải lên: 14/02/2014, 03:20

... a set of pressure vs temperature measurements, the nonlinear regression can be performed using a statistical software packages The following constraints are imposed to obtain meaningful Antoine ... Product, the grams of VOC per sheet shall be calculated as follows: Total Grams VOC per S R S D Sheet Where: S = mass, in grams, of the dryer sheet sample R = mass, in grams, of sample residue by gravimetric ... modified in design Ultra-torr fittings and Ultra-torr flex-lines ballast on the vacuum side of the isoteniscope manifold as depicted in ASTM D 2879-97 schematics, has been removed stainless steel...

Ngày tải lên: 14/03/2014, 20:20

... identifying VOC sources in complex systems such as the air system in Houston but also revealing the various important features of these sources Acknowledgments This work was supported by the United States ... the same emitted mass is released into a larger volume of air as wind speed increases; the concentration therefore decreases (16) However, the factors of sources and increase with increasing wind ... measurement should have its own uncertainty, it is practical since it produces satisfactory analysis results Finally, the estimated uncertainties for the compounds in this study, acrylonitrile, isoprene,...

Ngày tải lên: 22/03/2014, 14:20

... additional sources such as biomass burning and mixing with other urban sources (see Voss et al (2010) for more discussion) Biomass burning in uences, for example, would tend to increase the measured ... evolves, diffuses and is transported, including the essential feature of the increasing relative importance of OVOCs versus NMHCs as the plume evolves (see Fig for a comparison with measurements) The ... simulated primary anthropogenic and biomass burning organic aerosols during MILAGRO: implications for assessing treatments of secondary organic aerosols, Atmospheric Chemistry and Physics Discussions,...

Ngày tải lên: 28/03/2014, 20:20

... Landfill gas emission model The landfill gas emission model used in this paper is one of the numerous models embedded in Analytical Contaminant Transport Analysis System (ACTS) software This particular ... uncertainty analysis was used to ensure a more representative and reliable exposure and health risk results Conclusions • This study has demonstrated the utility of the Landfill Gas Emission Model for ... simulation This simulation is built into individual models of the ACTS and RISK software including the Landfill Gas Emission Model (Mustafa [11]) “Monte Carlo simulation or analysis is a process that...

Ngày tải lên: 05/09/2013, 16:11

... 6.4 mm (1/4 in) in outside diameter, with a single end opening for admission of sample 6.6 The instrument shall be intrinsically safe for operation in explosive atmospheres as defined by the ... emissions exist as described in Section 8.3.2 8.3.2.2 Seal System Degassing Vents, Vessel Vents, Pressure Relief Devices Accumulator If applicable, observe whether or not the applicable ducting ... ducting or piping where emissions could be vented or sources where leaks could occur, the sampling surveys described in Section 8.3.2 shall be used to determine if detectable emissions exist 8.3.3...

Ngày tải lên: 14/02/2014, 08:20

... climates   public wells   sparse hydric soils   septic systems   RCRA facilities Type  of  variable S T T S T S S I F T T S T I T F S F T S I T S T F T T T S S S S S F T I T S S T F I S S F S T I S ... aquifer studies This is the first national assessment of the occurrence of a large number of VOCs with different uses, and the assessment addresses key questions about VOCs in aquifers The assessment ... prior use (s) of these three THMs are as solvents for fats, waxes and resins, heavy liquid for geological assays, fire-extinguisher agents, and as an intermediate in chemical synthesis Chloroform...

Ngày tải lên: 14/03/2014, 19:20

... buyers, sellers, and states (issuers of permits), to assist in formulating consensus testing protocols A goal of verification testing is to enhance and facilitate the acceptance of small drinking ... plants The opportunity for the sales of such systems in other countries is also substantial The EPA has partnered with NSF International (NSF) to verify performance of small drinking water systems ... process to intermittent operation Verification testing procedures shall simulate routine conditions as much as possible and in most cases testing may be done in the field Under such circumstances,...

Ngày tải lên: 14/03/2014, 19:20

... application process, VOC emissions and emissions reductions, and costs associated with the use of alternative coating formulations and equipment used in the automobile refinishing industry This information ... repair shops use an in- house color mixing machine system This system comprises a paint measuring scale, a catalog of color chips and formulas, and a rack containing forty to sixty, 1-gallon cans of ... technical information that State and local agencies can use to develop strategies for reducing VOC emissions from automobile refinishing operations This section presents the findings of this study including...

Ngày tải lên: 22/03/2014, 14:20

... quantify as many VOCs as possible, but at least those contained in a list of known VOCs of special interest and those representing the 10 highest peaks The list of compounds of special interest is shown ... thresholds, (b) methods for measuring supraliminal intensities, and (c) methods for classification or scaling of perceived qualities The methods for measuring absolute detection thresholds as well ... classes) Sometimes the responses are assessed on ordinal (rank order), interval (distance is constant, relative to a zero-point), or ratio scales (ratios are constant, absolute zero-point) Physical-chemical...

Ngày tải lên: 28/03/2014, 19:20

... specific hazardous gases The sensing device based on a nanoporous AAO platform is simple, easy to miniaturise, inexpensive and has great potential for the development of gas sensing devices for a range ... deposition, SEM characterisation, assembly of RIfS sensing device, testing of sensing performance data processing and composition of the draft manuscript LP was involved in designing and in the fabrication ... a nanoporous AAO platform, instead of planar polymer films previously used for RIfS sensing and biosensing, is in providing a unique three-dimensional morphology of pore structures and the flexibility...

Ngày tải lên: 18/06/2014, 22:20

... specific hazardous gases The sensing device based on a nanoporous AAO platform is simple, easy to miniaturise, inexpensive and has great potential for the development of gas sensing devices for a range ... deposition, SEM characterisation, assembly of RIfS sensing device, testing of sensing performance data processing and composition of the draft manuscript LP was involved in designing and in the fabrication ... a nanoporous AAO platform, instead of planar polymer films previously used for RIfS sensing and biosensing, is in providing a unique three-dimensional morphology of pore structures and the flexibility...

Ngày tải lên: 20/06/2014, 04:20

... Figure The setup of real-time oral malodour measurements The use of RIFs sensing device showing the volunteer and the parts of sampling and sensing devices The gas sampling was performed using three ... deposition, SEM characterisation, assembly of RIfS sensing device, testing of sensing performance data processing and composition of the draft manuscript LP was involved in designing and in the fabrication ... VSCs within these limits by the Au-AAO sensor confirms the high sensitivity of this sensor and its suitability for making such measurements [24] By changing the surface chemistry of AAO with selfassembled...

Ngày tải lên: 20/06/2014, 23:20

... Research Institute for useful discussions Kevin Pardon is acknowledged for thiols precursor synthesis The research was supported by an Industry Partnership grant of the University of Western Sydney ... during fermentation H 2S is formed during fermentation as an intermediate in the biosynthesis of the sulfur-containing amino acids (pathway is illustrated in Figure 2c) This pathway involves reduction ... 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 where...

Ngày tải lên: 20/06/2014, 23:20

... n .s n .s n .s p < 0.001 p < 0.05 p < 0.001 n .s p < 0.05 n .s n .s n .s n .s n .s n .s p < 0.001 n .s n .s n .s n .s n .s n .s n .s n .s p < 0.001 p < 0.001 p < 0.001 n .s n .s n .s n .s P < 0.01 P < 0.05 n .s n .s ... logistic regression analysis Classification of cases with multinomial logistic regression analysis ** Correctly classified cases 82.5% of the subjects were correctly classified There were no significant ... for the statistical analyses Results In the case of the follow-up study, Student 's t test for repeated measures was applied to the benzene and toluene levels; Wilcoxon 's test was used for all...

Ngày tải lên: 12/08/2014, 18:21

... cất khí H 2S d Xử lý H 2S dung dịch natri thioasenat Na4As 2S5 O2 Phản ứng hấp thụ khí H 2S dung dịch natri thioasenat xảy sau : H 2S + Na4As 2S5 O2 = Na4As 2S5 O + H2O -Tiếp theo , natri thioasenat hoàn ... b Công nghệ xử lí H 2S NaOH -Cơ s phương pháp khí H 2S kết hợp với NaOH theo phản ứng sau đây: H 2S + NaOH = Na 2S + 2H2O Na 2S + H 2S = 2NaHS Na 2S + H2O = NaHS + NaOH -Song song với phản ứng trên, ... kéo dài phản ứng phụ chậm sau có thẻ xảy : Na4As 2S5 O2 + H 2S = Na4As2O7 + H2O Na4As 2S7 + O2 = Na4As 2S6 O + 2S -Dung dịch hấp phụ natri thioasenat chuẩn bị cách hòa tan As2O3 natricabonat Na2CO3...

Ngày tải lên: 12/04/2015, 14:24

... insulating fluid for industrial transformer and capacitors In addition, PCBs were also used as plasticizers in sealants, caulkings, synthetic resins, rubbers, paints, waxes and asphalts, and as surface ... agency, Singapore Northeast National Oceanic and Atmospheric Administration xvi NUS OCCs OCPs OM PAHs PCBs PLS PM3 POA ppLEFRs PUF QSPR RH S. D SE SEA SFE SIM SML SOA spLFERs SRM SSW SVOCs SW Temp TSM ... mechanism of SVOCs from the atmosphere o Chapter 8: The Exchange of SVOCs Across The Air-Sea Interface In Singapore s Coastal Environment This chapter discusses the transfer of SVOCs from the atmosphere...

Ngày tải lên: 11/09/2015, 10:15

... costs (Kornegay, 1979; Lee et al., 1983; Wiesner, Rook, and Fiessinger, 1987) As contactor size increases, fixed costs increase because of the greater cost of larger systems Operating costs decrease ... also form in field installations in the presence of humic substances Because such compounds might form, and because their health effects are unknown, the application of chlorine-containing disinfectants ... hydrophobic groups such as ᎏCH2ᎏ, its solubility decreases and its extent of adsorption increases as long as the molecule can gain entrance to the pores When an increase in size causes the molecule...

Ngày tải lên: 14/02/2014, 03:20