Dx100 ion chromatograph

The sorption of SO₂ takes place in 0.3% H₂O₂ solution. Sulfur dioxide was oxidized to sulfate ion, which was determined by ion chromatography using DX100 ion chromatograph (Dionex, USA) with AO4S column. Daily concentrations of SO₂ absorbed in the glass scrubber were calculated (Svanberg et al. 1998 (link)).
Nitrogen dioxide absorbed on the sintered glass was reduced to nitrite ion in an aqueous-glycol medium containing iodide and arsenate ions. After exposure, the sintered glass was washed with water, and the nitrite ion concentration was determined by spectrophotometry (Specol 11) at a wavelength of 540 nm. Then, the daily concentration of NO₂ absorbed by the sintered glass was calculated (Svanberg et al. 1998 (link)).

Air-dried and sieved (2 mm mesh) soil samples were shaken in water for 1 h (1:10, w:v) using a 358S shaker (Elan, Warsaw, Poland). A DX-100 ion chromatograph (Dionex, Sunnyvale, CA, USA) was used to determine the N-NH₄, and the ICS-1100 ion chromatograph (Dionex, USA) was used to determine the N-NO₂ and N-NO₃.