1 / 28

SCOS97-NARSTO VOC Measurements Quality Assurance Issues

This document discusses the quality assurance issues related to VOC measurements during the SCOS97-NARSTO project, including performance audits, speciated hydrocarbons, carbonyl compounds, and other VOC comparisons.

dleach
Download Presentation

SCOS97-NARSTO VOC Measurements Quality Assurance Issues

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. SCOS97-NARSTO VOC MeasurementsQuality Assurance Issues Eric Fujita Division of Atmospheric Sciences Desert Research Institute University and Community College System of Nevada Reno, Nevada SCOS97-NARSTO Data Analysis Conference Diamond Bar, CA February 13-15, 2001

  2. PAMS VOC Measurements During SCOS97-NARSTO

  3. Supplemental VOC Measurements During SCOS97-NARSTO

  4. Supplemental VOC Measurements During SCOS97-NARSTO (continued)

  5. VOC Measurement Audits and Comparisons Speciated Hydrocarbons • Participants: ARB, EPA, BRC, DRI, SDAPCD, SCAQMD, VCAPCD, BAAQMD, and AAC • Three sets of collocated ambient samples - morning sample from Los Angeles, afternoon sample from Azusa and late afternoon sample from Santa Monica. Carbonyl Compounds • Performance audit involving sampling from a standard mixture of carbonyl compounds prepared in 33-liter tank by DRI. Participants - AtmAA, AAC, SCAQMD, VCAPCD, and SDAPCD • Field comparison at Azusa on September 23 and 24. Participants - DRI, AtmAA, AAC, SCAQMD, VCAPCD, and ManTech. Other VOC Comparisons • Biogenic compounds: Adsorbent tubes (UCR) with collocated canister samples (DRI and BRC) at Riverside. • Halogenated compounds: Continuous GC/ECD (DGA) with canister samples (DRI - Zielinska and Schorran) at Azusa.

  6. SCOS97-NARSTO Quality AssuranceHydrocarbon Performance Audits • Participants • Coordination, data compilation and analysis (Eric Fujita, DRI and Mike Miguel, ARB) • DRI 12-port manifold canister sampling system (Larry Sheetz, DRI) • Collection of ambient samples (Pat Harrington, ARB) • Participating laboratories: ARB, U.S. EPA, Biopheric Research Corporation, Desert Research Institute, SDAPCD, SCAQMD, VCAPCD,BAAQMD, ManTech Environmental Technology, Atmospheric Analytical Consultants. • Audit Samples • Los Angeles N. Main (morning sample): AAC, ARB, BAAQMD, BRC, DRI, EPA, SCAQMD, SDAPCD, VCAPCD, ARB (duplicate), DRI (duplicate), EPA (duplicate). • Azusa (afternoon sample): AAC, ARB, BAAQMD, BRC, DRI, EPA, SCAQMD, SDAPCD, VCAPCD, ARB (duplicate), DRI (duplicate), EPA (duplicate). • Santa Monica (evening sample): BRC, DRI, EPA, SDAPCD, VCAPCD.

  7. SCOS97-NARSTO Hydrocarbon Audit Los Angeles N. Main Ambient Sample – Functional Type and Totals

  8. SCOS97-NARSTO Hydrocarbon Audit Azusa Ambient Sample – Functional Type and Totals

  9. SCOS97-NARSTO Hydrocarbon Audit Santa Monica Ambient Sample – Functional Type and Totals

  10. SCOS97-NARSTO Hydrocarbon AuditAzusa Ambient Sample Outlier – Average above 1 ppbC with Lab/DRI ratio < 0.7 or >1.3 Outliers excluded from regressions.

  11. SCOS97-NARSTO Hydrocarbon AuditLos Angeles, N. Main Ambient Sample Outlier – Average above 1 ppbC with Lab/DRI ratio < 0.7 or >1.3 Outliers excluded from regressions.

  12. SCOS97-NARSTO Hydrocarbon AuditAzusa Ambient Sample Outlier – Average above 1 ppbC with Lab/DRI ratio < 0.7 or >1.3 Outliers excluded from regressions.

  13. SCOS97-NARSTO Quality AssurancePerformance Audits for Sampling and Analysis of Carbonyl Compounds • Participants • Coordination, data compilation and analyis (Eric Fujita, DRI and Randy Pasek, ARB) • Preparation and analysis of carbonyl standard (Greg Harshfield, DRI) • Audit equipment (Larry Sheetz, DRI) • Participating laboratories: SDAPCD, SCAQMD, VCAPCD, Atmospheric Assessment Associates (AtmAA), Atmospheric Analytical Consultants (AAC). • Audit Sampling • Standard mixture of four carbonyl compounds in 33 liter tank prepared by DRI. • Standard mixture in 6-liter transfer canister and gas standard delivery system sent to participants • Sample from standard mixture with ~ 200:1 dilution.

  14. Gas Standard Delivery SystemPerformance Audits of Carbonyl Compound Measurements Consists of a mass flow controller, a 6-liter stainless steel gas standard transfer canister, and a 3-way valve and tee assembly. The flow controller is preset to provide a flow of 5.0 ml per minute. Prior to shipment of the system, fittings and stainless steel sampling lines are cleaned with deionized water and baked at 170oC for 24 hours.

  15. SCOS97-NARSTO Carbonyl Audit SCAQMD and SDAPCD

  16. SCOS97-NARSTO Carbonyl Audit Atmospheric Assessment Associates (AtmAA)

  17. SCOS97-NARSTO Carbonyl Audit Atmospheric Analytical Consultants (AAC)

  18. SCOS97-NARSTO Carbonyl Audit Ventura County APCD

  19. SCOS97-NARSTO Quality AssuranceMeasurement Comparison of Halogenated Compounds Ventura County APCD

  20. SCOS97-NARSTO Quality AssuranceMeasurement Comparison of Isoprene

More Related