Abstract
A conventional 90° mass spectrometer has been modified to permit the simultaneous collection and measurement, by means of a null method, of the ion currents due to the isotopic species of sulphur dioxide at masses 64 and 66. The design of a magnetic valve system to facilitate the rapid change from one sample to the other is described, as well as an improved ion source and collector assembly. By this method analyses may be carried out more rapidly and it has been found that the results are reproducible to ±0.02% from day to day, this compares with 0.1% precision obtained with single collection methods in this laboratory. The analytical procedure is outlined.
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