Citation:

Sickles, J.E. AND W. McClenny. FIELD COMPARISON OF METHODS FOR THE MEASUREMENT OF CONTRIBUTORS TO ACIDIC DRY DEPOSITION. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-90/363 (NTIS PB91163774), 1990.

Description:

A field study was conducted to compare methods for sampling and analysis of atmospheric constituents that are important contributors to acidic dry deposition. hree multicomponent samplers were used: the Canadian filter pack (FP), the annular denuder system (ADS), and the transition flow reactor (TFR). unable diode laser absorption spectrometer (TDLAS) provided continuous reference measurements of NO2 and HNO3. itrogen dioxide was also monitored with continuous luminol-based chemiluminescence monitors and with passive sampling devices (PSDs). he study was designed to provide a database for statistical comparison of the various methods with emphasis on the multicomponent samplers under consideration for use in a national dry deposition network. he study was conducted at the ry deposition station in Research Triangle Park, NC between 29 September and 12 October, 1986. aily averaging and/or sampling times were employed for the 13-day study; weekly samples were also collected, but results from these samples are not compared in this paper. ifferent measurements of ambient concentrations of the following constituents are compared: total particulate and gaseous NO3, HNO3, NO2, total particulate NH4, NH3, total particulate SO4, and SO2.

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