Determination of sulfur dioxide by ultraviolet absorption spectrometry

Reversible absorption of SO2 by amino acid aqueous solutions

“…As mentioned earlier (Section 3.5), SO 2 dissolves in water and ionized partly to form bisulfite ion. The two peaks observed at 276 nm and 204 nm in spectra 4 are assigned to SO 2 and HSO 3 − [26,27], respectively. The absorption peak of SO 2 at 276 nm is also observed in the ultraviolet spectra of the ␤-Ala solution saturated with SO 2 (spectra 2) confirming that small portion of the SO 2 indeed simply dissolves physically in the ␤-Ala solution, as noted in Section 3.4.…”

Determination of phosphorus, sulfur and the halogens using high-temperature molecular absorption spectrometry in flames and furnaces—A review

“…The first attempts to determine sulfur by MAS date back to the early 1970s, when Syty [80] and Winkler and Syty [81] investigated the molecular absorption bands of SO 2 . These investigations were carried out using kind of a chemical vapor generation at room temperature in a reaction flask and MAS of a cold gas.…”

Simple spectrophotometry method for the determination of sulfur dioxide in an alcohol-thionyl chloride reaction

“…A C C E P T E D ACCEPTED MANUSCRIPT There are many reports for the analyses of sulfur dioxide, including ion chromatography (IC) [4], fluorescence [5], gas chromatography-mass spectrometry (GC-MS) [6], colorimetric [7], ultraviolet (UV) spectrophotometry [8], and inductively coupled plasma-atomic emission spectrometry (ICP-AES). However, each method has some limitations.…”

“…Colorimetric method [7] typically involves lengthy sample treatment such as color development, and is not preferred for in-process control, which requires a fast analysis. The UV spectrophotometry method described by A. Syty [8] cleverly utilizes strong acid to release sulfur dioxide from an absorbing solution, and transfer it to a flow-through absorption cell using a carrier gas for the measurement of UV absorbance at 215 nm. Unfortunately, sulfur dioxide has very good solubility in NMP, the solvent that was used for the chlorination reaction even in the presence of about 1 M hydrochloric acid, the by-product of chlorination reaction.…”