Carbon-coated annular denuders and ion chromatographic measurements for the determination of nitrogen-containing species (NO2 and NOy) in remote atmospheres

Nitrate postdeposition processes in Svalbard surface snow

“…The flux measurements revealed both emissions and deposition fluxes of all the investigated compounds (NO, NO 2 , HNO 3 − , and p‐NO 3 − , Figures and ) and where the mean NO and NO 2 concentrations were in agreement with other measurements in the coastal Arctic boundary layer during the same time of year [ Allegrini et al ., ; Beine et al ., , ; Amoroso et al ., ; Sander and Bottenheim , ]. Although the calculated daily NO and NO 2 fluxes (Figure ) are in the lower region of what has earlier been reported for Ny‐Ålesund by Amoroso et al .…”

The origin of sea salt in snow on Arctic sea ice and in coastal regions

“…quality control/assurance procedures (Allegrini et al, 1999;Perrino et al, 2001). The lower detection limits (L.O.D.)…”

Occurrence of gas phase ammonia in the area of Beijing (China)

“…Annular denuder techniques are considered to be able to overcome these critical sources of error. In general, such systems are designed with a vertically positioned denuder tube to eliminate the sedimentation of particles (Possanzini et al, 1983;Allegrini et al, 1987Allegrini et al, , 1999Febo et al, 1989;Perrino et al, 1990). This sampling technique is able to accurately determine gaseous ammonia and particulate ammonium without disturbing the partition existing in the atmosphere at the time of the sampling and without mutual interferent (Perrino et al, 1999(Perrino et al, , 2002.…”

“…Problems occurred on 9 February between 10:00 and 12:00 in the morning and on 19 August between 22:00 and 00:00, thus data from these events were not considered. The annular denuder sampling method and the analytical procedures were described in several past works (Possanzini et al, 1983;Allegrini et al, 1987Allegrini et al, , 1999Febo et al, 1989;Perrino et al, 1990Perrino et al, , 2001aBeine et al, 2001;Ianniello et al, 2002). After collection, the denuders and filters were extracted and samples were analyzed within 24-h by using Ion Chromatography (IC) (Dionex DX 120 connected with autosampler DX AS50 for anions and DX ICS90 connected with autosampler DX AS40 for cations).…”