1997 Progress Report: Techniques for Standardization, Validation, and Measurement of Targeted Trace Gases Which Participate in Tropospheric Ozone FormationEPA Grant Number: R825261
Title: Techniques for Standardization, Validation, and Measurement of Targeted Trace Gases Which Participate in Tropospheric Ozone Formation
Investigators: Apel, Eric C. , Gilpin, Tim
Current Investigators: Apel, Eric C. , Fried, Alan , Gilpin, Tim , Riemer, Dan
Institution: National Center for Atmospheric Research
EPA Project Officer: Shapiro, Paul
Project Period: January 1, 1997 through December 31, 1999
Project Period Covered by this Report: January 1, 1997 through December 31, 1998
Project Amount: $472,250
RFA: Air Quality (1996) RFA Text | Recipients Lists
Research Category: Air Quality and Air Toxics , Air
Objective:The research objectives covers three distinct areas: (1) the development of necessary standards for target oxygenated volatile organic compounds (OVOCs); (2) the development of accurate analytical methods, including a formaldehyde method, to verify the standards and to lay the groundwork for reliable ambient measurements; and (3) development of a calibration facility whereby university researchers, including PAMS personnel (cartridges), may come to calibrate and test their instruments under simulated ambient conditions.
Progress Summary:Progress has been made towards accomplishing the objectives in the three areas described above. We have developed a technique to make OVOC standards and have made two high pressure cylinders containing compounds in the high ppbv/low ppmv range. We are in the process of analyzing the cylinders over a period of time. A preliminary GC/FID method using established techniques using a DB WAX column is currently being used to monitor concentrations. A new-design manual system and auto GC/FID/MS is being developed and both will come on next year. A modular OVOC permeation tube system is currently under development and will also come on line in the near future. A formaldehyde system based on the Hantzsch reaction is being developed. A separate permeation tube system for formaldehyde is on-line. A 2 meter all-glass manifold has been built at NCAR and set up to deliver a zero air stream containing standards and possible interferent species (Figure 1). A zero air generation system (AADCO 737-12) is located next to the inlet delivering ultra pure air with less than 1 ppm water and ambient levels of CO2. This zero air generator will be used in conjunction with the glass manifold to deliver synthetic air along with standards and possible interferents to help validate our methodology and, in the future, to test other analysis systems for accuracy of the particular method in question. It is possible to run ambient levels of VOC species and interferents of interest. Systems are available to deliver spikes of O3 and, H2O. In the near future we will add NOx and SO2. and NO/NO2 using this manifold. In addition, detection techniques will be brought on-line which continuously monitor the levels of these spikes within the air stream.
Figure 1. Manifold system for diluting standards and testing interferences.
Future Activities:We will continue to progress as specified in our proposal. We will continue to develop the multi-technique approach to generate high quality OVOC standards and validate them with state-of-the-art techniques.
Journal Articles on this Report : 2 Displayed | Download in RIS Format
|Other project views:||All 9 publications||4 publications in selected types||All 4 journal articles|
||Apel EC, Calvert JG, Greenberg JP, Riemer D, Zika R, Kleindienst TE, Lonneman WA, Fung K, Fujita E. Generation and validation of oxygenated volatile organic carbon standards for the 1995 Southern Oxidants Study Nashville Intensive. Journal of Geophysical Research-Atmospheres 1998;103(D17):22281-22294.||
||Apel EC, Calvert JG, Riemer D, Pos W, Zika R, Kleindienst TE, Lonneman WA, Fung K, Fujita E, Shepson PB, Starn TK, Roberts PT. Measurements comparison of oxygenated volatile organic compounds at a rural site during the 1995 SOS Nashville Intensive. Journal of Geophysical Research-Atmospheres 1998;103(D17):22295-22316.||