Open AccessIntercomparison of measurements of sulfur dioxide in ambient air by carbonate‐impregnated filters and Teco pulsed‐fluorescence analyzers
Author(s) -
Ferek Ronald J.,
Covert Paul A.,
Luke Winston
Publication year - 1997
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/96jd03587
Subject(s) - sulfur dioxide , environmental science , parts per notation , carbonate , analytical chemistry (journal) , volume (thermodynamics) , filter (signal processing) , sulfur , materials science , environmental chemistry , meteorology , chemistry , inorganic chemistry , physics , metallurgy , organic chemistry , quantum mechanics , computer science , computer vision
In two previous University of Washington field programs, airborne measurements of SO 2 using carbonate‐impregnated filters and a Teco pulsed‐fluorescence analyzer showed excellent agreement over a range of ambient concentrations from 2 to 127 ppbv. As part of the Gas‐Phase Sulfur Intercomparison Experiment (GASIE), ambient air, diluted fivefold to tenfold with zero air, was sampled in the concentration range of 0.02 to 4 ppbv. With the bulk of the measurements in the range of 40 to 230 parts per trillion by volume (pptv), agreement between the two techniques was again very good (regression equation: Teco =1.07(filter)+4.5 pptv, r =0.93). Using careful precleaning, impregnation, storage, and handling techniques for the filter substrates, at sub‐100 pptv concentrations, the filter method is capable of an accuracy of better than ±10% with a ±7 pptv uncertainty (due to blank variability) for 6 m 3 samples. In addition, the Teco model 43S is capable of rather precise measurements of sub‐100 pptv concentrations (approximately ±16 pptv) provided a suitable averaging time is employed (at least 10 min).