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Ambient Particulate Sulfate and Nitrate Monitors: Performance Summary

Explore the performance of R&P 8400S and 8400N monitors during PMTACS-NY field campaigns and routine measurements. Discover operational issues, measurement results, and comparisons with semi-continuous instruments.

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Ambient Particulate Sulfate and Nitrate Monitors: Performance Summary

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  1. R&P 8400S and 8400N Ambient Particulate Sulfate and Nitrate Monitors: Performance during PMTACS-NY Intensive Field Campaigns and Routine Measurements(Poster Summary) Olga Hogrefe1, Oliver V. Rattigan, James J. Schwab1, Frank Drewnick1, Kevin Rhoads1,3, Kenneth L. Demerjian11 -Atmospheric Sciences Research Center, U-Albany, Albany, NY;2 - Division of Air Resources, New York State Department of Environmental Conservation, Albany, NY; 3 – Siena College, Loudonville, NY Prepared for EMEP Workshop on Particulate Matter Measurement & Modeling April 20-23, 2004, New Orleans, LA

  2. Poster Overview • Introduction: PMTACS-NY intensive sampling campaigns and NYSDEC routine SO4 and NO3 measurements; • R&P 8400N/8400S design, main features and operational problems; • 8400S (SO4) and 8400N (NO3) measurements results: time series, diurnal patterns, monthly variations of mass concentrations, comparisons with 24-hr filters and other semi-continuous instruments, measuring SO4 and NO3 • Summary and acknowledgements

  3. 8400S and 8400N Operational Problems • Short (few days) lifetime NiChrome flash strips; • Decreasing efficiency of molybdenum converter of 8400N NOx analyzer. • Non-linear aqueous calibration at higher injected amounts of SO4 (>180 ng) and NO3 (>60 ng). • Ambient T/RH probe sometimes fails (especially in rainy weather). • Short (1-2 weeks) life time of Platinum flash strips • High (>0.5 mg/m3) and irregular dynamic blanks – QC2004 • High cost of some spare parts and consumables • Most problems associated with 8400N/8400S operation were or can be resolved.

  4. Mass Concentration Time Series (Intensive Studies)

  5. WfM IS52, Bronx Mass Concentration Variations (Routine Measurements) Average Diurnal Patterns (IS52, Bronx, NY) Monthly Variations of SO4 and NO3 Mass Concentrations

  6. Comparisons with Other Semi-Continuous Instruments and 24-hr Filters • Recovery – linear regression slope with intercept set to 0; • Instruments used for comparisons: Aerosol Mass Spectrometer (AMS), Particle-Into-Liquid-Sampler with Ion Chromatographs (PILS-IC), 24-hr TEOM ACCU filters and 24-hr STN filters. • 8400S measurements agree with AMS, PILS-IC and filter-based measurements within 12% or less. • Discrepancy between 8400N and AMS/PILS-IC is 10-40%. Compared to filters, 8400N under-measures nitrate by 30-40%.

  7. Questions • What have we (can we) learned about the PM problems from continuous measurements? • What are the advantages of continuous measurements? • Should continuous measurements replace time-integrated measurements; if so, over what timescale? Are continuous measurements ready for prime time? • How is confidence in the values created in lieu of standards?

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