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SHOULD NADP SAMPLE FOR GASEOUS NH3 IN THE GREAT PLAINS ?

SHOULD NADP SAMPLE FOR GASEOUS NH3 IN THE GREAT PLAINS ?. WHAT CAN NADP DO?. WHAT CAN NADP DO?. Nothing Try to get other groups involved to “fill-in” CASTNET coverage. Ogawa Sample. WHAT CAN NADP DO?. A Field Intercomparison of Eight Ammonia Measurement Techniques

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SHOULD NADP SAMPLE FOR GASEOUS NH3 IN THE GREAT PLAINS ?

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  1. SHOULD NADP SAMPLE FOR GASEOUS NH3 IN THE GREAT PLAINS ?

  2. WHAT CAN NADP DO?

  3. WHAT CAN NADP DO? • Nothing • Try to get other groups involved to “fill-in” CASTNET coverage. • Ogawa Sample

  4. WHAT CAN NADP DO? • A Field Intercomparison of Eight Ammonia Measurement Techniques • Winston T. Luke(1), Jack Meisinger(2), Charlotte Schomburg(2), Joseph Scudlark(3), Ronald L. Siefert(4), Randolph K. Larsen*(5), and Irvin K. Heard(6) • - eight active and passive sampling techniques designed to measure ambient gas phase ammonia (NH3) and particulate ammonium (NH4+) • inlets of all the samplers were located within 3 m horizontally and 1 m vertically and at a height of approximately 4 m. • eighteen sampling intervals, ranging in duration from 6 to 23 hours.

  5. WHAT CAN NADP DO? • The techniques: • four active, batch sampling methods (cyclone separator and annular denuder/backup filter collection of NH3 and NH4+ followed by ion chromatography (IC); honeycomb denuder/filter collection of NH3 and NH4+ followed by IC; phosphoric acid solution impinger/IC measurements of total ammonium; and bulk filterpack collection of NH3 and NH4+ followed by IC analysis).

  6. WHAT CAN NADP DO? • Two continuous techniques were also compared: • a mist chamber to collect total ammonium and p-NH+ followed by fluorescence derivitization with a liquid wavecore detector; and • a commercial chemiluminescence detector.

  7. WHAT CAN NADP DO? • Finally, two passive sampling devices for gas-phase NH3 were deployed: • a Willems badge design and • an Ogawa passive sampler.

  8. Run-averaged NH3 concentrations ranged from 0.1 to over 30 µg N/m3. The outputs of the continuous techniques reveal considerable temporal variation in NH3, with concentrations ranging from almost zero (during fog and precipitation events) to over 150 µg N/m3 in transient events. The comparison demonstrated the inherent difficulty in accurately quantifying ambient NH3 near an active NH3 source. Agreement between some of the techniques was quite good. The passive Ogawa and Willems samplers reported concentrations which agreed quite well with annular denuder results (m = 1.17, r2 = 0.968, n = 3). For total NH4+, agreement between the annular. WHAT CAN NADP DO?

  9. WHAT CAN NADP DO?

  10. WHAT CAN NADP DO?

  11. Objective: Start mid-summer 2004 a one year duration trial of passive NH3 sampling at select NTN sites using the Ogawa/Scudlark technique Rationale: -Reference Scudlark, et al 2003. -NTN coverage, -Need to address policy decisions related to potential reductions, effects, regional patterns. -This method is doable at low powered sites with minimal cost and infrastructure requirements. -CAL performing analysis guarantees efficient, repeatable analytical chemistry and reduces uncertainty. -Accent long-term stability of the NADP platform. WHAT CAN NADP DO?

  12. WHAT CAN NADP DO? Outline: Select 15 to 20 NADP/NTN sites which transect north-south and east-west through the NH3 hotspot in the center of the US including existing CASTNET and or IMPROVE sites. Estimated budget: $ 75,000 one man year, $ 75,000 analytical costs blanks active runs QA and set-up $5000 travel and $5000 hardware.

  13. WHAT CAN NADP DO? • Method: Hire 1 new staff (NS) member to accomplish all project phases with the exception of the analytical chemistry. • Ogawa passive sampler 4 pre-assembled shipping/sampling units per site • Preloaded canisters from CAL sent to sites

  14. WHAT CAN NADP DO? Sites load 3" PVC canister onto the west side of the NADP collector -Minimize OP contact with Ogawa media, -OP pops the end off of the PVC tube (which could double as shipping device) -snaps into a stand-off mounted to the leg bolts of the ACM, -re-bags the end cap and it is used to return the Ogawa after exposure One week exposure Removal Every Tuesday Morning by NTN volunteer OPS

  15. WHAT CAN NADP DO? Ship to CAL in NTN mailers if possible Receipt and check-in follow CAL SOPS’s JP receives and NS takes from there Entry into autolab (sticky label on PVC exterior) Hooded un-mount of Ogawa Disassembly Removal of used media Cleaning Re-assembly of new media DI eluent then FIA and IC Run through ICP

  16. WHAT CAN NADP DO? Data analysis: -pair with wet data/emissions -CASTNET/IMPROVE/others (site list needs to accommodate) -report to funder -meeting presentation

  17. WHAT CAN NADP DO?

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