source sampling system Articles
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Effects of a zeolite SCR system on comprehensive emissions from a heavy-duty diesel engine
The effects of a zeolite urea-selective catalytic reduction (SCR) aftertreatment system on a comprehensive spectrum of chemical species from diesel engine emissions were investigated in this study. Representative samples were collected with a newly developed source dilution sampling system after an aging process designed to simulate atmospheric dilution and cooling conditions. Samples were ...
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Field measurements within a quarter of a city including a street canyon to produce a validation data set
Air pollutants and meteorological parameters were measured continuously by in situ instruments, path-averaging techniques (up to three DOAS systems), and SODAR inside a street canyon and in the surrounding area of 1 km x 1 km (Gottinger Strasse in Hanover, Germany) from 2001 until 2003 which are available in the data bank ValiData for validation of microscale models. During three IOPs tracer ...
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Hard to Find Configurations Part 2
Welcome back to the continuation on the “Hard To Find Filters”. Part 2 In the last post I covered the first 2 points of the ideal filer. In this post I will detail points 3, 4 and 5 Point 3 … be pure, down to nanograms, of the substance that you are measuring. Ideally, the filter used to capture particles in air or liquid for analysis, should contain zero of the substance ...
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Occurrence of
Aeromonas spp. in a random sample of drinking water distribution systems in the USAAeromonads are aquatic bacteria found in drinking water supplies worldwide. Some species, such as Aeromonas hydrophila, can cause disease in humans. For this survey, 293 United States public water systems were selected using random sampling, stratified by water source and system type. Water samples were collected during one year from three sites (six samples per site) in each system. Temperature, ...
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Metaldehyde still on the radar for UK water companies
The UK government’s ban on the sale of metaldehyde-containing slug pellets, introduced this summer, was in place for just a month when it was overturned by a High Court decision on 31 July 2019. This means that the substance will remain on the radar for water companies and environmental groups – for the moment at least. The Defra ban on substance came into force on 30 June, with the ...
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Overview of Rotating Disc Electrode (RDE) Optical Emission Spectroscopy for In-Service Oil Analysis
Introduction The basis of modern oil analysis is the use of optical emission spectroscopy (OES) to measure the ppm (parts per million) levels of wear metals, contaminants and additives in oil samples. Whatever else an oil lab may measure, a multi-elemental analysis is the core of in-service oil analysis. This paper gives an overview of Rotating Disc Electrode Elemental Spectroscopy and its use ...
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