metrology for ammonia in ambient air - metnh3.eu · background and need joint research project...

BACKGROUND AND NEED Joint Research Project within the Environment all of the C European Metrology Research Programme (EMRP) Reference gas mixtures – W 1 P • Develop improved traceable reference gas mixtures by static and dynamic gravimetric generation methods at ambient molar fraction levels (0.5 to 500 nmol/mol) under real air and laboratory conditions Ammonia detection by laser based optical standards – W 2 P • evelop and characterise D traceable optical transfer standards • Evaluate the applicability of open path measurement techniques as optical transfer standard Metrological transfer to field applicable P methods – W 3 • Giving guidance for the proper use of certified reference materials and sampling in field measurements • valuate and compare results produced with field E measuring methods, to develop suitable sampling methods in order to promote long-term efficiency monitoring of ammonia reduction measures Scheme of a dynamic reference gas generator based on the permeation method with two dilution steps A) carrier gas inlet, B) pressure regulator, C) mass flow meter, D) mass flow controllers, E) Oven with inserted ammonia permeation element, F) mass flow controller for split flow, G) backpressure regulator, H) overflow outlet, I) reference gas outlet. Measured and fitted CRDS spectra of 100 nmol/mol ammonia and 75 % relative humidity at 22 °C in synthetic air, results from the PTB Ammonia is a major ambient air pollutant Three main NH emission sources and its contribution: 3 Agriculture 93.6 %, waste 2.3 %, road transport 1.8 % and other 2.3 % (EEA*), 2011 European Directive 2001/81/EC regulates ammonia emissions in the member states Understanding ambient air quality including particulate matter and atmospheric impacts on ecosystems Ensure reliable ammonia measurements in analytical technology, uncertainty, quality assurance and quality control procedures SCIENTIFIC AND TECHNICAL OBJECTIVES Safety in technology and chemistry www.bam.de 2015-017 W Website: http://www.metnh3.eu JPR project coordinator: Bernhard Niederhauser (METAS) [email protected] BAM contact person: Carlo Tiebe [email protected] Air quality monitoring station near Waldhof photo by Axel Eggert, Umweltbundesamt Ammonia emission source on the example of animal husbandry. * EEA = European Environment Agency METROLOGY FOR AMMONIA IN AMBIENT AIR

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BACKGROUND AND NEED

Joint Research Project within the Environment all of theCEuropean Metrology Research Programme (EMRP)

Reference gas mixtures – W 1P• Develop improved traceable reference gas

mixtures by static and dynamic gravimetricgeneration methods at ambient molar fractionlevels (0.5 to 500 nmol/mol) under real air andlaboratory conditions

Ammonia detection by laser based opticalstandards – W 2P• evelop and characteriseD traceable optical

transfer standards

• Evaluate the applicability of open path measurementtechniques as optical transfer standard

Metrological transfer to field applicablePmethods – W 3

• Giving guidance for the proper use of certifiedreference materials and sampling in fieldmeasurements

• valuate and compare results produced with fieldEmeasuring methods, to develop suitable samplingmethods in order to promote long-term efficiencymonitoring of ammonia reduction measures

Scheme of a dynamic reference gasgenerator based on the permeationmethod with two dilution steps

A) carrier gas inlet, B) pressure regulator,C) mass flow meter, D) mass flow controllers,E) Oven with inserted ammonia permeationelement, F) mass flow controller for split flow,G) backpressure regulator, H) overflow outlet,I) reference gas outlet.

Measured and fitted CRDS spectraof 100 nmol/mol ammonia and75 % relative humidity at 22 °C insynthetic air, results from the PTB

Ammonia is a major ambient air pollutant

Three main NH emission sources and its contribution:3

Agriculture 93.6 %, waste 2.3 %,road transport 1.8 % and other 2.3 % (EEA*), 2011

European Directive 2001/81/EC regulates ammoniaemissions in the member states

Understanding ambient air quality including particulatematter and atmospheric impacts on ecosystems

Ensure reliable ammonia measurements inanalytical technology, uncertainty, quality assuranceand quality control procedures

SCIENTIFIC AND TECHNICAL OBJECTIVES

Safety in technology and chemistrywww.bam.de2

015-0

17 W

Website: http://www.metnh3.eu