Luftforurensing-kontinuerlig monitorering av aerosoler og gasser i luft

Ambient air quality is critical for our health and the environment.

MARGA is a fully autonomous sampling and measurement system that continuously measures the water-soluble gas and aerosol components that have a direct effect on air quality. These results can then be used to study the formation of aerosols from their precursor gases and how their concentration and composition vary with diurnal and seasonal cycles.

MARGA Monitor for Aerosols and Gases in Ambient Air from Metrohm Process Analytics

Key features of the MARGA

  • Single software controls sampling and analysis and displays full diagnostic information
  • Simultaneous measurement of water-soluble gas and aerosol components by a dual ion chromatograph
  • Time resolution of 1 hour, with full results available 1 hour after sample collection
  • Unattended operation for up to 2 weeks based on 10 L absorbent solution
  • Measurement with internal standard which eliminates the need for calibration

MARGA systems (2)

2060 MARGA R – Air monitoring for research campaigns

A402060120C
The Monitor for AeRosols and Gases in Ambient air (MARGA) uses ion chromatography to monitor air quality by measuring the concentration of water-soluble gases and aerosols in air containing different sizes of particulate matter. Air is drawn in to the instrument by a vacuum pump at a constant flow rate. Before entering the instrument, the maximum size of particulate matter (PM) can be limited by utilizing a size-selective inlet (e.g. PM 1.0, PM 2.5 or PM 10). The water-soluble gases are absorbed in a Wet Rotating Denuder (WRD) device and then the water-soluble ions in the aerosols are extracted in a Steam-Jet Aerosol Collector (SJAC).A dual-channel ion chromatograph (IC) quantifies anions and cations in aerosols and water-soluble gases simultaneously with high accuracies to reach detection limits as low as 0.001 µg/m3.The analyzer’s performance can be remotely observed by using a direct internet connection to make adjustments when necessary and to access stored results. The 2060 MARGA R version is ideal for research campaigns: the IC can be used as a standalone lab instrument for other projects when not in use for 24/7 air quality monitoring.Data collection with a time resolution of 1h to study e.g. diurnal variation or trajectory models for pollution events.Remote control or touch screen to easily access results, trend graphs, and more.Gases measured: Hydrochloric Acid (HCl), Nitric acid (HNO3), Nitrous acid (HONO), Sulfur dioxide (SO2), Ammonia (NH3)Aerosol ions measured: Chloride (Cl-), Nitrate (NO3-), Sulfate (SO42-), Ammonium (NH4+), Potassium (K+), Calcium (Ca2+), Magnesium (Mg2+)

2060 MARGA M – Continuous air monitoring

A402060110C
The Monitor for AeRosols and Gases in Ambient air (MARGA) uses ion chromatography to monitor air quality by measuring the concentration of water-soluble gases and aerosols in air containing different sizes of particulate matter. Air is drawn in to the instrument by a vacuum pump at a constant flow rate. Before entering the instrument, the maximum size of particulate matter (PM) can be limited by utilizing a size-selective inlet (e.g. PM 1.0, PM 2.5 or PM 10). The water-soluble gases are absorbed in a Wet Rotating Denuder (WRD) device and then the water-soluble ions in the aerosols are extracted in a Steam-Jet Aerosol Collector (SJAC).A dual-channel ion chromatograph (IC) quantifies anions and cations in aerosols and water-soluble gases simultaneously with high accuracies to reach detection limits as low as 0.001 µg/m3.The analyzer’s performance can be remotely observed by using a direct internet connection to make adjustments when necessary and to access stored results. The 2060 MARGA M version is ideal for 24/7 continuous monitoring at a permanent site.Data collection with a time resolution of 1h to study e.g. diurnal variation or trajectory models for pollution events.Remote control or touch screen to easily access results, trend graphs, and more.Gases measured: Hydrochloric Acid (HCl), Nitric acid (HNO3), Nitrous acid (HONO), Sulfur dioxide (SO2), Ammonia (NH3)Aerosol ions measured: Chloride (Cl-), Nitrate (NO3-), Sulfate (SO42-), Ammonium (NH4+), Potassium (K+), Calcium (Ca2+), Magnesium (Mg2+)

Advanced air sampling system for water-soluble gases and aerosols

First, air is drawn in to the sampling unit by a vacuum pump. Before the air sample enters the instrument, the maximum size of particulate matter (PM) can be selected by placing a size selective inlet (e.g., PM10 or PM2.5).

The water-soluble gases are absorbed in a Wet Rotating Denuder device, and then the water-soluble ions in the aerosols are extracted in a Steam-Jet Aerosol Collector.


Optimal accuracy achieved by using Metrohm Dosinos

You can rely on superior dosing repeatability and accuracy, as the 2060 MARGA is equipped with Metrohm Dosinos to ensure precise sample handling. Metrohm Dosinos have a resolution of 10,000 increments across the entire piston stroke and thus enable extremely precise dosing.

Each hour, two separate dosing units collect either the gas or aerosol sample simultaneously.

The third Dosino is used for transferring each sample to the online ion chromatograph.

Completely autonomous and unattended operation 24/7

A dual-channel ion chromatograph, based on Metrohm’s 940 Professional IC Vario series, automatically analyzes the ions from the collected gas and aerosol samples. An internal standard is added during the measurement for self-calibration and an instant performance check of the IC column.

Low reagent consumption enables unattended operation of either 1 week (1.0 m3/h) or 2 weeks (0.5 m3/h)*

*Estimate based on the consumption of 10 L absorbent solution.

Dedicated software to record and display all data remotely

The 2060 MARGA is operated by Metrohm Process Analytics’ 2060 software in combination with Metrohm’s MagIC Net software. This intuitive, easy-to-use software records all data with validation indicators for each result so that you can trust and report with confidence.

The 2060 MARGA is designed for monitoring in remote locations but never far from home – using a direct internet connection. Therefore, its performance can be remotely measured, adjustments can be made, and results can be downloaded at any time.

Worldwide acceptance of ETV verified MARGA

MARGA was developed by Metrohm Process Analytics in cooperation with the Energy research Centre of the Netherlands (ECN) and the U.S. EPA. Furthermore, it has been verified by the U.S. EPA Environmental Technology Verification Program (ETV).

MARGA – air monitoring around the globe

After the commercial launch in 2006, the MARGA has been used worldwide at >100 locations contributing data to many environmental monitoring programs and studies.
Sites of installed MARGA systems for aerosol and gas monitoring in ambient air

Nedlastning

MARGA excels by its capability of automated data acquisition as well as calculating and storing of results.
Fei Li, researcher at the aerosol ingredient laboratory, Institute of Tropical and Marine Meteorology, Guangzhou