benzene concentration Articles
-
An assessment of urban VOC emissions and concentrations by comparing model results and measurements
From September 1994 to June 1996, the city of Antwerp carried out a volatile organic compound (VOC) measurement campaign in the urban agglomeration of Antwerp. The results were used to further validate a traffic emission model for the city of Antwerp and to evaluate the performance of three different "street canyon" models that were applied to calculate benzene concentrations at ten ...
-
Sensitivity to input parameters of Mobile6.2-AERMOD simulated emissions and concentrations
This study investigates the sensitivity of simulated emissions and airborne NO 2 and benzene concentrations to model input parameters. Emission factors were estimated using Mobile6.2 and ambient concentrations were estimated using AERMOD. The simulation was performed for Huron Church Road in Windsor, Ontario, Canada, an arterial road 9 km in length with an average vehicle speed of 50 km/h. ...
-
Removal of benzene from wastewater via Fenton pre-treatment followed by enzyme catalyzed polymerization
This study investigated the feasibility of a two-step process for the removal of benzene from buffered synthetic wastewater. Benzene is outside the scope of enzymatic removal. In order to remove it from wastewater using enzyme, its pretreatment by modified Fenton reaction was employed to generate the corresponding phenolic compounds. In the first phase, the optimum pH, H2O2 and Fe2+ ...
-
The environmental aspects of the evaporation of BTEX from gasoline with and without ethanol
In this work the vapours from two columns simulating gasoline–contaminated soils (with and without ethanol) were monitored. Standards mixtures of BTEX, containing different ethanol contents were also analysed. The instrumental analysis was performed by Gas Chromatography with a Flame Ionisation Detector. Among BTEX, except benzene, in both columns the evaporation rate increases with time. In the ...
-
Detecting Benzene in a Refinery environment
Why you need to take Benzene seriously Benzene remains an important industrial chemical, but is well known as extremely hazardous and recognised as a ca rcinogen. Legislation across the globe has been put in place to ensure exposure of Benzene at plants where it is produced is minimised. Modern PID instruments offer the means to monitor Benzene concentrations down to 10 ppb or better. Benzene ...
-
The facts about Benzene exposure
Benzene and Benzene exposure Today, we look some more at benzene and more importantly benzene exposure. Benzene evaporates easily and most people can detect its distinctive smell at concentrations between 2.5 and 5 parts per million (ppm) in air. As well as inhalation, benzene can be absorbed into the body through the skin or by swallowing material containing it. The effects on ...
-
German Environmental Survey IV: environmental tobacco smoke exposure of German children
As the current extent of Environmental Tobacco Smoke (ETS) exposure of children in Germany is unknown, it was investigated in the German Environmental Survey (GerES IV) for Children from 2003 to 2006 using questionnaires and analyses of cotinine in urine and benzene and formaldehyde in indoor air. About half of the 3- to 14-year-old children in Germany live in households with at least one smoker. ...
-
Case study – benzene contamination - tank battery, Weld County, Colorado
Introduction LTE was requested by Devon Energy Corporation (Devon) to remediate residual soil and groundwater impacts at an exploration and production site in Weld County, Colorado. Soil impacts were found from the surface to 24 feet below ground surface (bgs) and were a result of produced water sump and aboveground storage tank overfills. Benzene concentrations in the groundwater were up to ...
-
Detecting benzene in refinery atmospheres
Summary Benzene remains an important industrial chemical, but is well known as extremely hazardous and recognised as a carcinogen. Legislation across the globe has been put in place to ensure exposure of benzene at plants where it is produced is minimised. Modern PID instruments offer the means to monitor benzene concentrations down to lOppb or better. Introduction Benzene is a natural ...
-
A coupled simulation and fuzzy-rule-based method for assessing health risks at a petroleum-contaminated site
Risk assessment of contaminated sites is crucial for evaluating adverse health impacts on local communities, and provides effective decision support for site-remediation practices. In this study, a coupled simulation and fuzzy-rule-based method was proposed for health risk assessment of groundwater contamination, and applied to a petroleum contaminated site. Benzene concentrations under two ...
-
The power of precise remediation
Design matters in in-situ remediation. Just ask Resource Geoscience, Inc. (RGI), a Remediation Products, Inc. BOS 200 approved installer and certified Trap and Treat Consultant. They recently demonstrated that when paired with proper injection design and precise application, BOS 200 can get the job done where others fail. The site: Contaminated clay site in Colorado The contamination: BTEX ...
-
Southern New Jersey - Guaranteed benzene remediation in soil and groundwater - Case Study
Project Summary TRS Group, Inc. (TRS) under contract with URS Corporation ( URS) and Resource Environmental, LLC (RELLC) conducted an electrical resistance heating (ERH) remediation of benzene at a former gasoline service station located in southern New Jersey, The project scope of work was contracted as a Guaranteed Fixed Price Remediation (GFPR) that included no rebound of benzene in ...
-
Photocatalytic decomposition of benzene by UV illumination with the presence of nano–TiO
2Anatase–TiO2 has been successfully coated on the surface of quartz cotton (SiO2) and alumina fibre (Al2O3) by the sol–gel method. The thickness of single layer of TiO2/SiO2 is 1 µm, while that of TiO2/Al2O3 is 300 nm. The TiO2 crystals are fine with the diameter varied from 20 to 25 nm. The TiO2 crystalline structure is defined by XRD method, and the thickness of the coatings by either XRD or SEM ...
-
The performance evaluation of WinOSPM model for urban street canyons of Nantes in France
Air quality modelling is primarily the quantative approach. It is more difficult as it demands input data accuracy, uncertainties and the efficient methodologies to judge the extent of models accuracy. As a result, model validation has to be regarded as an integral part of the modelling process. Furthermore, models are often validated on a limited number of testcases therefore, appropriate ...
-
Sulfate-Enhanced bioremediation of BTEX - Case Study
Problem A former gas station in North Carolina contaminated groundwater with BTEX from a UST basin. The site is now in the median of a busy four-lane highway. Residents within 250 feet of the site use an irrigation well, prompting the need to conduct proactive remedial action. Site conditions of sand and clay above partially weathered bedrock and depleted sulfate concentrations within the plume ...
By Redox Tech
-
Case study – benzene contamination pilot study - retail gasoline site, Northglenn, Colorado
Introduction LTE was contracted by Shell Oil Products US (Shell) to conduct a pilot test program at a petroleum hydrocarbon impacted retail facility north of Denver, Colorado. The goals of the pilot program were to: 1) Determine the viability of using a carbon-based injectate (RPI’s BOS 200®) to remove hydrocarbons from soil and groundwater, 2) Assess transient hydraulic conditions ...
-
airmoTWA: New Expert System for GC-FID/MS
Chromatotec has developed the first TRAP-GC-FID/MS designed for continuous monitoring of Volatile Organic Compounds (VOCs), inorganic molecules and permanent gases. In addition to the mass spectrometer (MS), this system encompasses the same trap, thermo desorption and separation technologies as airmoVOC analyzers (current mCERTS approved GCs analyzers). For VOCs analysis, the Flame Ionization ...
-
Formaldehyde and Aromatic Volatile Hydrocarbons in the Indoor Air of Egyptian Office Buildings
Indoor and outdoor measurements of formaldehyde and the aromatic hydrocarbons: benzene, toluene, ethylbenzene, m,p-xylene and o-xylene (BTEX) were conducted at six offices in a suburban area in Giza, Egypt, during the winter 2003-04 season. The mean indoor level of formaldehyde was 59.79ppb in offices where there was no smoking and 85.01ppb in offices where people smoked. The highest mean level ...
-
Potential use of Syntrichia ruralis for monitoring atmospheric BTEX
Many studies deal with the bioaccumulation of metals in mosses. In contrast, the knowledge about organic pollutants is less extensive and there is a relative lack of studies using plants for the biomonitoring of volatile organic compounds such as Benzene, Toluene, Ethylbenzene and Xylenes (BTEX). Both in situ and in controlled conditions, this study deals with the capacity of mosses to accumulate ...
-
Volatile Organic Compounds measurement in urban tropical environment: Concentration levels near cities
Theme 8: Air Pollution in a Tropical Climate Rapid urbanization and economic development in South-East Asia in past decades has led to air pollution problems such as excess of nitrogen oxides (NOx), carbon monoxide (CO) and volatile organic compounds (VOCs). Motor vehicle exhaust, industrial emissions, chemical solvents as well as biogenic emissions are the major anthropogenic sources of VOCs. ...
Need help finding the right suppliers? Try XPRT Sourcing. Let the XPRTs do the work for you