David Oram University of East Anglia, UK Relevant areas of expertise • GC-MS measurements of halocarbons (primarily canister sampling) – Cape Grim, Mace Head – CARIBIC – Research aircraft (BAe-146) • Also GC-ECD.
Download ReportTranscript David Oram University of East Anglia, UK Relevant areas of expertise • GC-MS measurements of halocarbons (primarily canister sampling) – Cape Grim, Mace Head – CARIBIC – Research aircraft (BAe-146) • Also GC-ECD.
David Oram University of East Anglia, UK Relevant areas of expertise • GC-MS measurements of halocarbons (primarily canister sampling) – Cape Grim, Mace Head – CARIBIC – Research aircraft (BAe-146) • Also GC-ECD and GC-FID experience • PTR-MS measurements of selected VOC and OVOCs – Weybourne Observatory (semi-continuous since late 2002) – Research aircraft (BAe-146) – Acetone, methanol, aromatics, isoprene, terpenes + others WEYBOURNE Atmospheric Observatory – Established 1992/3 (West Beckham 1989-91) – UEA NMHC record for 1989-1995 (canisters, GC-FID) – UEA took part in AMOHA, NOMHICE – Partner in EU HANSA network – Semi-continuous PTR-MS data since late 2002 – New VOC instrument planned for 2006 – Full-time manager (B. Bandy) – Supported by NERC-UFAM Current Instrumentation at WAO • • • • • • • • • • • NO/NO2/NOy (Annox, Teco 42S) Ozone SO2 CO H2 HCHO CN PTRMS WAO Met: AWS LAN/Data Network Remote Access Not continuous • • • H2O2 PAN Canister sampling New Instrumentation (2006) • • • • CO2 Vertical sounder/profiler GC ECD/FID (CH4 and N2O) GC FID/FID (VOC/oVOC) Acetone at Weybourne (ppb) January May - June October Toluene at Weybourne (ppb) January May - June October Questions/Comments • • What was outcome of previous (1995) VOC meeting ? How have measurements/technology improved since 1995 ? – NOMHICE, AMOHA, (others ?) – Summary of recommendations Proposed compounds • Need GC-MS (or ECD?) for halocarbons • CH3CN by FID ? • How to measure CH2O ? Standards • • Do world standards exist for TCE/PCE, CH3CN, oxygenates ? Are gas phase OVOC standards currently good enough ? Canister sampling • Which compounds are stable? – • Oxygenates, terpenes ? Which surface is best? – SS, silcosteel, glass (humidity effects) – Further testing may be required Safety and legality • Canisters/cylinders used for sampling and standards need to conform to latest regulations. – Transportable pressurised containers – US DOT or EU pi mark not globally accepted ?