A comparison of filter,denuder, and real-time chemiluminescence techniques for nitric acid determination in ambient air |
| |
| Institution: | 1. Department of Physics, K. N. Toosi University of Technology, 15875-4416 Tehran, Iran;2. Laser and Plasma Research Institute, Shahid Beheshti University, G. C, 1983963113, Evin, Tehran, Iran;1. Indian Institute of Tropical Meteorology, Pune, India;2. European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra, Italy;3. Lancaster Environment Centre, Lancaster University, Lancaster, UK;1. School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA;2. Air Force Research Laboratory, Wright–Patterson AFB, OH 45433, USA |
| |
| Abstract: | Measurements of gas-phase nitric acid were made by four separate techniques during a 7-day summertime period at a near-coastal site on Long Island, NY. Results from methods intercomparison data for HNO3, and their relationship to particulate NO3− and other odd N and oxidant species show the following: (a) high-volume filter pack HNO3 concentrations are well correlated with diffusion denuder difference (DD) results, except for small absolute losses with the former; (b) daytime real-time two-channel chemiluminescence HNO3 levels correlated well with DD results, but were higher during night-time periods; (c) results by a new Al2(SO4)3 denuder/thermal evolution technique were not in agreement with other techniques. Based on HNO3 and paniculate NO3 results reported herein, it appears that negative errors in HNO3filter-sampling techniques resulting from HNO3 loss by sorption generally exceed positive errors NH4NO3 volatilization at this site. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
