air analysis Articles

  • Importance of Inspecting Reservoirs

    Inspecting Reservoirs – what is the importance of them, why they are inspected, and how ROVs help pave the way for low-cost, regular maintenance. What is a Reservoir? Deriving from the French word réservoir meaning “storehouse,” a reservoir is exactly that – a storage place for water. More often than not, these bodies of water are ...


    By Deep Trekker Inc.

  • 10 Reasons why you should continuously monitor low temperature and liquid chemical sterilants for worker safety

    1. Sterilant chemicals are highly toxic Low temperature and liquid chemical sterilants are designed to kill all microorganisms including resistant spores and if they were not toxic, they would not be effective in sufficiently high concentration to destroy all microbial life including the chemically resistant sporicidal forms of certain ...


    By ChemDAQ, Inc.

  • Odour Control at Pesticide Facilities: Eliminating volatile compounds

    Chemical formulation plants are susceptible to emissions of unpleasant and malodorous volatile compounds, a fact which makes the implementation of efficient odour control measures essential. North-western Spain is home to one of the country's oldest industrial sites for the manufacture of phytosanitary products, with some facilities located relatively close to populated areas. Recently, the ...


    By Bioconservacion SA

  • Oil Sampling Best Practices (Part 2)

    Understanding Dynamic Particle Equilibrium in Closed Loop Systems Dynamic Equilibrium Condition (DEC) is defined as a steady state condition where the normal wear rate in a machine results in no net gain or loss of particles. ...


    By Spectro Scientific

  • Indoor Air Analysis - Zigbee

    PPM Technolgy"s new IAQ profile monitor featured as part of the Telegesis ZigBee case ...


    By PPM Technology

  • Thermodynamic analysis of an air solar collector

    The paper presents the experimental study of an air solar installation with a collecting area AC = 4.2m² and variable working fluid flow rate in the range 0.02÷0.06 kg/s. The experimental data are processed statistically through thermodynamic analysis, using energy (semi-empirical) and exergy methods. The aim of the paper is to establish the optimal air flow rate through this solar thermal ...


    By Inderscience Publishers

  • Exergy analysis of an air solar heater

    This paper presents an exergetic analysis of a downward flat plate collector, an unglazed selective absorber collector and an artificial rough surface collector. The analysis is based on mass, energy and exergy balance equations. The results show that for the Reynolds number of Re = 4000, the daily exergy output rate varies inversely with the mass flow rate per unit area, while the exergy ...


    By Inderscience Publishers

  • Industrial Hygiene: Quality Assurance In Air Sampling and Analysis

    Industrial hygiene is the recognition, evaluation, and control of chemical, physical, biological, and ergonomic stresses in the workplace. Of the stresses listed, chemical stresses in the form of air contaminants are the most common. Air contaminants, their PELs and TLVs, and how to sample for them, is Industrial Hygiene 101 for most industrial hygienists. However, as simple as sampling and ...


  • Ambient Air Quality Analysis of Toxic Gases and Priority

    The EPA regional offices who continuously monitor ambient air quality have determined that combustion by-products and automobile exhaust make up the largest source of air pollution throughout the U.S., with more severe conditions existing overseas. Despite concerns about the conditions outdoors, air quality in the workplace and home environment receive even more attention. The EPA’s list of ...


    By Buck Scientific Inc

  • Air pollution modelling, sensitivity analysis and parallel implementation

    A new approach for Sensitivity Analysis (SA) in the field of air pollution modelling is proposed and applied to the Unified Danish Eulerian Model (UNI-DEM), a large-scale air pollution model. The SA requires numerous model experiments with different values of the studied parameters. By simultaneous variation of these parameters we produce a set of multidimensional discrete functions. These huge ...


    By Inderscience Publishers

  • Implementing QALYs in the Analysis of Air Pollution Regulations

    In recent years, there has been growing interest in cost-effectiveness analysis for environmental regulations using quality-adjusted life years as the measure of effectiveness. This paper explores the implications of the QALY approach for measuring the impacts of air pollution regulations, with an example using the U.S. Environmental Protection Agency’s Heavy Duty Engine/Diesel Fuel regulations. ...


    By Springer

  • 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

  • Energy and exergy analysis of a double–pass thermoelectric solar air collector

    Analysis of energy and exergy has been performed for a double–pass thermoelectric (TE) solar air collector. The incident solar radiation heats up the absorber plate so that a temperature difference is created between the thermoelectric modules that generate a direct current. Only a small part of the absorbed solar radiation is converted to electricity, while the rest increases the ...


    By Inderscience Publishers

  • Sensitivity analysis of indoor air exergy with environment reference state in China

    This paper analyses the exergy of air in the building affected by the reference state, considering parameters of temperature and humidity of air. Taking TMY data of 25 typical cities in different building thermal climate zones of China and considering the chemical and physical exergy of air, the exergy of air in the building influenced by the dynamic and static reference state is comparatively ...


    By Inderscience Publishers

  • Steady versus dynamic exergy analysis: the case of an air source heat pump

    Exergy analysis is often performed statically, for given system conditions and reference state. Dynamic exergy analyses, considering the variation of system operation and ambient conditions, would obviously be more time consuming. Therefore comparing the results of the two approaches helps understand when the dynamic methodology should be preferred. In this paper the yearly behaviour of a ...


    By Inderscience Publishers

  • One-step analysis of bubble-particle capture interaction in dissolved-air flotation

    The capture of particles by air microbubbles in dissolved air flotation has been analysed using a one-step (holistic) approach, which numerically solved the motion equation (with the inclusion of microhydrodynamic resistance functions and surface forces) for both the bubble-particle collision and attachment interactions. Model predictions with the inclusion of non-DLVO attractive surface force ...


    By Inderscience Publishers

  • Evaluating Guidelines for Air Sampling Methods Utilizing Chromatographic Analysis

    The following evaluation guidelines were developed to provide chemists of the Methods Development Team with a uniform and practical means for evaluating sampling and analytical methods that utilize chromatographic techniques. The guidelines define sampling and analytical parameters, specify required laboratory tests, statistical calculations, and criteria for acceptance, and provide a detailed ...

  • Polyurethane Foam as an Effective Adsorbent for Pesticides in Air (GC Analysis)

    Polyurethane foam (PUF) is a lightweight, easy-to-use material for sampling pesticides in air. Low back pressure allows sampling times and representative samples. A PUF filter cartridge designed to attach to the front of an ORBO-1000 PUF sampling cartridge traps aerosols and particulate matter, is easily and conveniently assembled, and can be removed from the ORBO-1000 cartridge and capped ...


    By Sigma-Aldrich Co., LLC

  • Statistical analysis of urban air-pollution data in the Athens basin area, Greece

    Air pollutant concentrations recorded in the Athens basin area by a network of stations are analysed and examined to estimate the typical behaviour of the air pollutants, especially with regard to daily, weekly and annual periodicities and meteorological dependencies. Also, an attempt is made to predict daily and monthly concentrations by utilising a statistically based model, that is, a multiple ...


    By Inderscience Publishers

  • Daily air pollution time series analysis of Isfahan City

    Different time series analysis of daily air pollution of Isfahan city were performed in this study. Descriptive analysis showed different long-term variation of daily air pollution. High persistence in daily air pollution time series were identified using autocorrelation function except for SO2 which seemed to be short memory. Standardized air pollution index (SAPI) time series were also ...

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