Laboratory Evaluation of Sulfur Dioxide Methods and the Influence of Ozone-Oxides of Nitrogen Mixtures.

Field DynamicCalibrationof SO2Recording Instruments

“…Periodic testing merely verifies previously reported results, e.g. Terraglio and Manganelli, 20 that the sample is stable for 72 hr after exposure. Our field experience indicates that the over-all agreement between the four manual samples (two sequences of dual simultaneous impingers) is ±2%.…”

Spectrophotometric determination of atmospheric sulfur dioxide

“…Interferences associated with the present methods for the determination of sulfur dioxide have been reviewed by Thomas (5) and by Mueller et al (6). Several investigators have suggested modifications to eliminate interferences or increase reliability (7)(8)(9)(10)(11)(12). It was decided that an investigation of important parameters and of possible modifications would be of value.…”

Gas Analysis

“…Terraglio (201) has evaluated the spectrophotometric method, iodimetric method, and an acidimetric method for the determination of sulfur dioxide. The acidimetric and spectrophotometric methods gave comparable average recoveries while the iodimetric method recoveries were lower.…”