chemical vapor analysis Articles

  • Modeling Tip: How to Import BREEZE AERMOD files into BREEZE Risk Analyst for Human Health Risk Assessments

    Humans can be exposed to hazardous air pollutants (HAPs) either directly through inhalation or indirectly through ingestion or dermal contact, which can result in acute or chronic health effects. The risk of exposure varies depending on a number of variables, including the meteorological conditions, local geographical and emissions characteristics, the age of the individuals being exposed, and ...

  • Modification of tubular ceramic membranes with carbon nanotubes using catalytic chemical vapor deposition

    In this study, carbon nanotubes (CNTs) were successfully grown on tubular ceramic membranes using the catalytic chemical vapor deposition (CCVD) method. CNTs were synthesized at 650°C for 3–6 h under a 120 mL min−1 flow of C2H6 on ceramic membranes impregnated with iron salt. The synthesis procedure was beforehand optimized in terms of catalyst amount, impregnation duration ...


    By IWA Publishing

  • Mercury Analysis

    Characteristics of Mercury What is Mercury? Mercury is a naturally occurring silver-colored metallic element noted for its occurrence as a liquid at room temperature and toxic to living organisms. This silvery, opaque liquid metal is very dense, yet has a high surface tension that causes it to form tiny perfect spheres in the pores of the rocks it is found in. It is ...


    By HORIBA Europe GmbH

  • How Close to Contamination does a Property need to be for Vapor Intrusion to be a Concern?

    Cinnaminson, NJ, February 19, 2013 There are numerous sites across North America that have contaminated soil or groundwater due to manmade pollution.  Some of these sites have been a problem for decades and as communities have grown, more and more residential and commercial properties have been built above or near these areas. A major issue for properties built near these contaminated ...


    By EMSL Analytical, Inc.

  • Hazardous chemicals and proper storage solutions

    Many acceptable categorical storage schemes have been proposed and used by laboratories in academic, industrial, government and medical institutions. The common features uniting all these plans is the separation of incompatible materials. The differences in these various storage schemes arises in the number of groups that should be established for segregation purposes. The ten most commonly cited ...


    By US Chemical Storage

  • High Quality Moisture Analysis for High Value Resins

    Whether you’re making syringes or turkey basters, pacemakers or milk jugs, maintaining the correct moisture content in your resins is essential to your production process. Join us February 9-11 in Anaheim, CA at Plastec West / MD&M West, booth 3920, and see why our instruments are considered the leaders in moisture analysis for the medical device ...


    By Arizona Instrument LLC

  • "A Non-Chemical Water Treatment for Cooling Towers"

    Untitled Document Introduction This paper will describe a case study of a ...


    By Dolphin WaterCare

  • Gas cell selection for analysis of electronic gases

    APIMS and FTIR remain the preferred analytical tools for monitoring impurities in the electronic  specialty gases used by the semiconductor industry, although other tools such as CRDS are currently finding application in selected cases. FTIR spectroscopy offers the advantage of the simultaneous measurement of all gaseous species that exhibit dipole moment changes during vibrations at ...


    By CIC Photonics, Inc.

  • "Non-Chemical Water Conditioning at Schick: A Pollution Prevention Case Study"

    Untitled Document Overview Since 1994, the Schick company of Milford has ...


    By Dolphin WaterCare

  • How High-Pressure DSC Can Accelerate Reactions and Shorten Analysis Time

    Increased pressure influences all physical changes and chemical reactions in which a change in volume occurs. In a complimentary webinar from METTLER TOLEDO, learn how high-pressure differential scanning calorimetry (DSC) allows faster materials testing for timely product development and responsive quality management. METTLER TOLEDO is pleased to present a new webinar, “High ...


    By Mettler - Toledo Int. Inc

  • The IMPROVE_A Temperature Protocol for Thermal/Optical Carbon Analysis: Maintaining Consistency with a Long-Term Database

    Thermally derived carbon fractions including organic carbon (OC) and elemental carbon (EC) have been reported for the U.S. Interagency Monitoring of PROtected Visual Environments (IMPROVE) network since 1987 and have been found useful in source apportionment studies and to evaluate quartz-fiber filter adsorption of organic vapors. The IMPROVE_A temperature protocol defines temperature plateaus ...

  • Removal of hexavalent chromium by chemical modification of 4,4′-((1Z,11Z)-2,5,8,11-tetraazadodeca-1,8-diene-1,11-diyl)diphenol: kinetic and equilibrium modeling

    This study aimed to synthesize a new resin through immobilization of the 4,4′-((1Z,11Z)-2,5,8,11-tetraazadodeca-1,8-diene-1,11-diyl)diphenol (TRA) onto silica gel modified (Si-CPTS) with 3-chloropropyltrimethoxy silane (CPTS) and its application for the removal of chromium(VI) ions from aqueous solution as well as from industrial wastewater. The same applications were also made for industrial ...


    By IWA Publishing

  • Development of a novel odor measurement system using gas chromatography

    This paper describes a novel odor measurement system for creating arrays of virtual chemical sensors with nonoverlapping responses using ultrahigh-speed gas chromatography with a surface acoustic wave sensor (GC/SAW). This GC/SAW system provides high-resolution twodimensional olfactory images for easy recognition of many complex odors. Separation and quantification of the individual chemicals ...

  • Understanding QSPR uncertainty in environmental fate modeling

    In cases where experimental data on chemical‐specific input parameters are lacking, chemical regulations allow the use of alternatives to testing, such as in silico predictions based on quantitative structure‐property relationships (QSPRs). Such predictions are often given as point estimates; however, little is known about to what extent uncertainties associated with QSPR predictions contribute ...


    By John Wiley & Sons, Ltd.

  • Solid-phase extraction of room-temperature imidazolium ionic liquids

    Abstract Owing to their favorable properties, ionic liquids have recently gained recognition as possibly environmentally benign solvents. Now among the most promising industrial chemicals, they have already been labeled 'green' but this appellation seems due entirely to their very low vapor pressure. This growing interest in the various applications of ionic liquids will soon result in ...


    By Springer

  • High VOC Loadings in Biofilters - Petroleum and Industrial Applications

    ABSTRACTMore cost effective alternate technologies are needed to meet the demands of existing and upcoming Federal air regulations. Bio-Reaction Industries, Inc. (BRI) has developed a patented, modular, high-rate, vapor-phase biofilter that has provided such a solution for a major oil company for the past four years. This compact system has adsorbed and digested high VOC surge concentrations ...


  • A Comparison Between EPA Compendium TO-15 and EPA MEthod 8260B for VOC Determination of Soil Gas

    ABSTRACT Evaluations of vapor intrusion pathways of chemical contaminants often include soil gas measurements to assess the potential for indoor inhalation. No longer just a screening tool, soil gas measurements are requiring a level of quality and defensibility which should be incorporated in soil gas analytical protocols. While both EPA Compendium Method TO-15 and EPA SW-S46 Method 8260B ...


    By Eurofins Air Toxics Inc

  • TCE Hot Spots have California Residents Concerned

    For years, many people living near the Moffett Federal Airfield by Mountain View, California, have had concerns over toxic chemicals known to be in the soil and groundwater in the area. After a recent report by the U.S. Environmental Protection Agency (EPA), some residents now admit to being scared. The EPA has found higher than expected levels of trichloroethylene, also known as ...


    By EMSL Analytical, Inc.

  • European On-Line Particle Mass Spectrometry

    An international workshop on European On-line Particle Mass Spectrometry (PMS) was held 29th-30th of November 2005 at the JRC in Ispra, Italy. The main goals of the Workshop were: 1) To get together all European scientists involved in the field of PMS 2) To review the latest scientific progress on the field of PMS, with particular emphasis on:a. New instrumentationsb. Data analysisc. ...


  • CIRAS-2 User Recalibration of CO2 and H2O

    The CIRAS-2 CO2/H2O analyzer is an inherently stable instrument and does NOT require frequent calibration. The AutoZero function corrects for nearly all changes that result in calibration drifts. The most common causes of drifts in CIRAS-2 readings are i) incorrect Zeros due to exhausted chemicals or ii) leaks on the desiccant columns from rolled or damaged o-rings and iii) incorrect Diff Bal, ...


    By PP Systems

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