atmospheric testing Articles

  • A Test Reference Year (TRY) approach to gas dispersion in the atmosphere

    For environmental analysis such as the dispersion of pollutants in the atmosphere, it is essential to have meteorological data that are relevant for a long period. In this paper, we explore the possibility of using an environmental Test Reference Year (TRY), i.e., a set of real, contemporaneous and hourly meteorological variables, 'extracted' from a hourly series of at least 10 years, for ...


    By Inderscience Publishers

  • The Boulder Atmospheric Observatory

    Abstract The Boulder Atmospheric Observatory (BAO) is a unique research facility for studying the planetary boundary layer and for testing and calibrating atmospheric sensors. The facility includes a 300 m tower instrumented with fast- and slow-response sensors, a variety of remote sensing systems, and a real-time processing and display capability that greatly reduces analysis time for ...

  • Read about Confined Space in Construction and Atmospheric Testing Right Here!

    In 1993, 29 CFR 1910.146 went into effect as the first federal legislation governing entry into permit-required confined spaces in general industry. Because some industries, such as the construction industry, were covered by specific Occupational Safety and Health Administration (OSHA) safety regulations, they were exempt from the confined space entry requirements of the general industry rule. ...


    By Argus-Hazco

  • The new IONICON APi-TOF presented at EGU and ASMS 2018

    Atmospheric Pressure Interface for the Modular ioniTOF Platform The ioniTOF is our modular and flexible, entry-level to high-resolution Time-of-Flight platform, featuring custom interfaces and high-performance IONICON hexapole ION-GUIDEs. All our renowned PTR-TOFMS series products are exclusively based on the ioniTOF. Now we took this concept one step further and developed an Atmospheric ...


    By Ionicon Analytik Ges.m.b.H.

  • Testing modified atmosphere packaging of gluten free bakery products - Case Study

    Gluten free bakery packaging tested using Systech Illinois gas analysis equipment Ultrapharm’s quality control laboratory use the Gaspace Advance, oxygen and carbon dioxide headspace analyser to monitor their modified atmosphere packs at regular intervals. Ultrapharm Ltd started their gluten free bakery business in 1993, manufacturing a small product line to coeliac’s in the UK. ...


    By Systech Instruments Ltd

  • Development and first tests of a data assimilation algorithm in a Lagrangian puff atmospheric dispersion model

    The development of a Data Assimilation algorithm based on variational approach that allows estimation of source emission rate in Lagrangian particle/puff Atmospheric Dispersion Models for non-stationary (wind and source) conditions is presented. The one-dimensional tests including constant and variable in time source emission rate and wind velocity showed that methodology can be extended to take ...


    By Inderscience Publishers

  • Evaluation of new generation atmospheric dispersion models

    The paper considers the regulatory view of evaluating dispersion models. There is no proscription for regulatory studies in the UK, so differences between dispersion calculations from different models and versions of models are then as important as their absolute veracity. An example shows variations in calculated concentration due to variations between two different versions of a model and two ...


    By Inderscience Publishers

  • High-Purity DNPH Standards for Monitoring of Atmospheric Carbonyls

    Analysts monitoring for atmospheric carbonyls follow prescribed methods published by the US Environmental Protection Agency, the California Air Resource Board, and the American Society for Testing and Materials (ASTM®). These methods call for trapping carbonyls on an adsorbent coated with dinitrophenylhydrazine (DNPH). Sigma Aldrich offers more than fifty 2,4-DNPH carbonyl derivative ...


    By MilliporeSigma

  • Validation of atmospheric dispersion models using ETEX data

    Two models frequently used to simulate the dispersion of pollutants in the atmosphere have been compared. This is necessary because only a well-tested and well-calibrated simulation model can be a good representation of the reality of the dispersion of pollutants. The models evaluated (HYSPLIT_4 with its four variants and MEDIA) were run using as input parameters the same meteorological dataset ...


    By Inderscience Publishers

  • Simulations of atmospheric dispersion in an urban stable boundary layer

    The results of numerical simulations of tracer dispersion in an urban stable boundary layer are presented. Both Gaussian approximation and fourth order closure are considered and a Gram-Charlier probability density function is used in our Lagrangian stochastic model. Different parameterisations for the boundary-layer height and different values of kurtosis are tested. The model is based on the ...


    By Inderscience Publishers

  • Assessment of particulates in the urban atmosphere of Sao Carlos, Brazil

    A survey on the concentration of particulate matter in the urban atmosphere was carried out in the city of Sao Carlos, Brazil. Five sites were selected for data collection one in the city centre (high concentration of people and automotive vehicles), three in industrial areas, and one at the interface with the countryside. The particle size distribution and mass concentration, temperature, ...


    By Inderscience Publishers

  • A Lagrangian particle model with chemical reactions: application in real atmosphere

    In this work, a Lagrangian particle model able to account for simple chemical reactions between NO and O3 has been improved to consider the photolysis of NO2. A system of chemical equations is numerically solved on a Eulerian grid, while the particle trajectories are moved in a Lagrangian frame. The ...


    By Inderscience Publishers

  • Modified atmosphere packaging of pre-packed meat - Case Study

    The Use of Systech Illinois' Gaspace Headspace Gas Analysers in the Pre-Packed Meat Industry Our Gaspace headspace gas analysers play a key role in quality assurance for Tulip International's Modified Atmosphere Packaging of pre-packed meat. Tulip International's cooked meats division is one of the largest producers of pre-packed bacon in the UK. Some of the output is vacuum ...


    By Systech Instruments Ltd

  • Statistical evaluation of centreline concentration estimates by atmospheric dispersion models

    Within the American Society for Testing and Materials (ASTM), a standard practice (Z6849Z1) is being developed to provide an objective statistical procedure for comparing air quality simulation modelling results with tracer field data. The practice is limited to steady state, local-scale transport from isolated point sources in simple terrain. Evaluation data having similar external conditions ...


    By Inderscience Publishers

  • Staff spotlight: atmospheric chemist addresses California air quality issues

    With over a decade of experience addressing West Coast air quality issues, Dr. Charles Lee, Managing Consultant in Trinity’s Irvine, California office, is a valuable resource on air quality, greenhouse gas (GHG), and risk related issues such as permitting requirements, air quality monitoring, source testing, auditing, GHG verifications, and health risk assessments. Dr. Lee is particularly ...


    By Trinity Consultants

  • Modified atmosphere packaging of dried fruit and fruit snacks - Case Study

    Systech Illinois’ oxygen headspace gas analyzer helps Whitworths maintain the quality of a million packs of dried fruit every week.  In the UK, Whitworths produces around a million packs of dried fruit and fruit snacks each week using modified atmosphere packaging (MAP) to ensure long product shelf life. Sample packs are tested every hour using a Systech headspace gas analyzer ...


    By Systech Instruments Ltd

  • The Atmospheric Dispersion Modelling System (ADMS): comparisons with data from the Kincaid experiment

    In order to test the ability of a model its results must be compared with experimental data; hence validation work is an essential part of the development of any model. This paper presents the results of a validation study of the UK Atmospheric Dispersion Modelling System (UK-ADMS) version 1.06, a short-range dispersion model, against the results of the Kincaid field experiment. Predictions of ...


    By Inderscience Publishers

  • Incineration Industry: Scrubber on Sludge Incinerator Reduces Atmospheric Emissions Case Study

    Aberdeen Sewage Treatment Plant in Aberdeen, Washington started up their new Electric Infrared Incinerator in May, 1981. The sewage sludge incinerator, product of Shirco, Inc., needed a pollution control device in order to meet state, local and federal requirements for atmospheric emissions, according to the emissions test on the unit performed January, 1982. Chosen was a Model 24×24- ...


    By CR Clean Air Group, LLC

  • Genotoxicity evaluation of atmospheric environments of subway stations in Seoul using Tradescantia micronucleus assay

    Airborne pollutants in subway facilities can be harmful to passengers. This study was done to examine whether the suspended particulates have clastogenic effects on the biological systems. Total suspended particulates were collected from subway stations in Seoul. Aqueous extracts from the particulates were tested with the Tradescantia micronucleus assay. All the plant cuttings exposed to the ...


    By Inderscience Publishers

  • A Nordic harmonisation effort concerning atmospheric dispersion modelling for real-time accident situations

    Neighbouring countries have often chosen different atmospheric dispersion prognosis models for use in emergency situations. This may result in differences in the predictions, which in turn can lead to the authorities adopting different countermeasures. In a Nordic project within the Nordic Nuclear Safety Research Programme (NKS), a Nordic harmonisation and comparison effort was initiated in the ...


    By Inderscience Publishers

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