Campaign

EUPHORE Chamber B Valencia, EUPHORE (CEAM Foundation), 2011.06.23 - 2011.07.06

Program:

The scenario of this campaign has comprised a set of experiments simulating typical urban and semi-rural conditions. In this regard, the following topics were proposed to be addressed:

  1. Intercomparison of techniques. A study of interferences will be conducted, investigating the impacts that the presence of potential interferants (i.e. seed aerosol, water vapour, NOx, short chain carbonyls and ozone) in the sample matrix, has on measurement. In addition, an experiment will be conducted in which diesel soot will be introduced as seed aerosols and GLY and MGLY will be added directly to the chamber or produced in-situ by reaction of OH with acetylene or propyne, respectively. The gas and aerosol phase evolution/composition will be monitored simultaneously.
  2. Sources of a-dicarbonyl compounds - photooxidation of isoprene. The primary and secondary yields of GLY and MGLY and other co-products such as methyl vinyl ketone and methacrolein will be determined under different experimental conditions (isoprene/NOx=134-380 ppt/5-60 ppb, relative humidity = 0, 25, 50%) in order to evaluate whether isoprene photooxidation is an important source of dicarbonyls under typical urban and semi-rural conditions.

The following instruments were installed and used during this campaign apart from other instrumentation already in place in EUPHORE:

Table 1. List of the instruments that will be used during intercomparison
Instrument Participant Species
ATOFMS (Aerosol Time of Flight Mass Spectrometry) Dr Maria Teresa Baeza and Dr Andrew Rickard, University of Leeds, UK On line analysis of size and composition of aerosols
Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (FT-ICR-MS), liquid chromatography-ion trap mass spectrometry (LC-MSn) Dr Jacqueline Hamilton, University of York, UK Off line analysis of aerosol composition
Blue LED-CE-DOAS instrument Prof Rainer Volkamer, University of Colorado, US GLY, MGLY in gas phase
Real time chemical ionization MS system (CIRTOFMS) Prof Paul Monks, University of Leicester, UK GLY, MGLY, MACR + MVK in gas phase
Long-path DOAS CEAM, Spain GLY/MGLY in gas phase
SPME technique is used with GC and GC/MS CEAM, Spain GLY /MGLY in gas phase
Fourier Transform Infrarred (FTIR) CEAM, Spain GLY/MGLY in gas phase
Gas Chromatography-(GC-PAN) CEAM, Spain MGLY
Broadband cavity enhanced absorption spectroscopy (BBCEAS technique) Prof , Steve Ball, University of Leicester, UK GLY in gas phase
Laser induced phosphorescence (LIP) Prof Frank Keutsch, University of Wisconsin, US GLY and MGLY in gas phase

The experiments described in Table 2 were carried out during this campaign:

Table 2. List of experiments carried out during alfa-dicarbonyl intercomparison campaign
Date Name of the experiment Objective Brief description of the experiment
24/06/2011 GLY intercomparison open 1 GLY freshly synthetysed were introduced in the chamber in high concentration (~40 ppb) and all the instruments started to measure, several dilutions were done until reach the range of tens of ppt
27/06/2011 MGLY intercomparison open 1 MGLY freshly synthetysed were introduced in the chamber in high concentration (~25 ppb) and all the instruments started to measure, several dilutions were done until reach the range of hundred ppt
28/06/2011 O3 + o-xylene. Open 1,2 GLY and MGLY were generated in situ and in the presence of O3. Cross interference GLY and MGLY. Interference of O3. Check of time resolution of different instruments.
29/06/2011 Isoprene. NOx control. Blind 2 Formation of GLY, MGLY and other producst like methylvinylketone was monitored when isoprene was added in the presence of a controlled amount of NOx. In this experiment the NOx control failed.
30/06/2011 O3+C2H2. Blind 1,2 Formation of GLY and MGLY from this reaction was monitored in the presence of high concentrations of ozone.
01/07/2011 Ambient air. Blind 1 Ambient air was introduced in the chamber
04/07/2011 Isoprene. NOx control. Blind 2 A repetition of the experiment carried out on 29/06/2011 but this time with a good control of NOx.
05/07/2011 GLY intercomparison. Blind 1 A repetition of the experiment carried oun on 24/06/2011 but this time it was a blind experiment. NO2 was added to check the effect of this interferant.
06/07/2011 MGLY intercomparison. Blind 1 A repetition of the experiment carried oun on 27/06/2011 but this time it was a blind experiment. NO2 was added to check the effect of this interferant.
Objectives: 1. Intercomparison of techniques; 2. Sources of a-dicarbonyl compounds - photooxidation of isoprene
NOTE: Open were experiments where different participants share their data while blind experiments where those where not sharing of data happened.

The first 3 experiments were set up as informal intercomparison and the rest of the experiments will be part of the formal intercomparison. In any case, it was agreed that, for a better dissemination of data, the results would be introduced in the EUROCHAMP database, therefore the data would be provided in text format (EDF).

Set up:

You can see some photographs.

Organizers:

Local organizers:

Experts committee:

Technical support (campaign preparation):

Technical support (during experiments):

EUPHORE staff

Referee:

Modelling:

Participants:

Instrument Institution Person
Blue LED-CE-DOAS instrument University of Colorado Volkamer, Rainer
Thalman, Ryan
BBCEAS Univ. Leicester Ball, Stephen
Daniels, Mark
DOAS CEAM Foundation Ródenas, Mila
CIRTOFMS University of Leicester Goodall, Iain
LIP University of Winsconsin Keutsch, Frank
Henry, Samuel
FTIR CEAM Foundation Ródenas, Mila
SPME technique is used with GC and GC/MS CEAM Foundation Sánchez, Pilar

Complementary instrumentation:

Instrument Institution Person
ATOFMS University of Leeds Baeza Romero, Maria Teresa
Peppe, Salvatore
FT-ICR-MS and LC-MSn University of York Hamilton, Jacqueline
Finessi, Emanuela
HCHO CEAM Foundation Muñoz, Amalia
SMPS CEAM Foundation Borrás, Esther
DNPH cartridges - LC/MS CEAM Foundation Vera, Teresa
O3 Monitor CEAM Foundation Vázquez, Mónica
NO/NO2 Monitor
J(NO2) Monitor
CO Monitor
SO2 Monitor
Metcon 2-PI Spectroradiometer Spectral Radiometry University of Leicester Goodall, Iain
Rickard, Andrew
TEOM University of Leeds Peppe, Salvatore

Supported by

EUROCHAMP2 logo EUROCHAMP

CEAM logo CEAM Foundation, supported by Generalitat Valenciana