June 2021 – Knowing what is inside!
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June 2021 – Knowing what is inside!

Particle measurement technology is often not just about counting the particles, but also about determining the chemical composition of the aerosol.

Usually, in the first step, the quantity, mass and size distribution of the collected particles are determined. The next step is to analyze and identify the components.

The fact that there are pollutants in the air in many places is undisputed, whether in industrial areas or in the usual urban environment. In the meantime, however, the focus is no longer just on proving whether and how many fine and ultra-fine particles are present. The additional goal is to identify them precisely in order to determine their origin, assess their potential risks and be able to take appropriate measures.

In the following we would like to introduce you to three of our measuring instruments that enable you to examine the composition of the collected samples.

Xact® 625i Ambient Metal Monitor from Cooper Environmental:
The Xact® 625i is suitable for measuring heavy metals and over 60 other elements in the ambient air. Thanks to the powerful X-ray fluorescence method (EDXRF) and time-resolved measurement (every 15 min in ng / m³), ​​the measuring device continuously provides information on the metal content in the PM fraction with detection limits that, depending on the element, are comparable to laboratory analyzes.
The ADAPT data analysis software, which evaluates the results almost in real time and shows them graphically on the touchscreen display, is particularly impressive. Various parameters such as meteorological correlations or the wind direction of the inflowing particles can be visually displayed in a matter of minutes and thus enable first conclusions to be drawn about the origin of the substances, which is an important tool for assessing emissions, especially in the vicinity of industrial plants.

Dekati® ELPI®+:
The electric low-pressure impactors of the ELPI®+ series collect particles and measure their size distribution and number concentration on 14 impactor stages in real time (up to 10 Hz). Thanks to the “modular system”, the ELPI®+ can be converted to individual measuring tasks. There are three main options:

  1. ELPI®+: Particle size range from 6 nm – 10 µm; Size distribution in 14 size classes
  2. High Resolution ELPI®+: Up to 500 size classes via software update
  3. High Temperature ELPI®+: With an extra heating module, direct measurement of gases up to 180 °C

Afterwards there is the possibility of a chemical and electromicroscopic analysis of the samples classified in the cascade stages. In addition, the ELPI®+ can be used for measurements of the particle charge size distribution as well as for traditional gravimetric impactor measurements.

Aethalometer® model AE33 from Magee Scientific / Aerosol:
The Aethalometer® model AE33 is used globally for the optical measurement of soot or black carbon. Several thousand Aethalometers® have been installed worldwide, in more than 70 countries on all seven continents.
The patented DualSpot™ technology counters the “filter loading effect” and thus enables use under dynamically changing environmental conditions. The Aethalometer® provides continuously corrected black carbon measurement data in real time without the need for post-processing. The parameters derived from this analysis also provide additional information about the aerosol composition and aging processes.


Are you interested in our measuring devices or have further questions? Contact us!

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