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Record number: 1, Textual support number: 1 CONT

Flame Photometric Methods. When SO₂ is burned in a hydrogen flame, the resulting electronically excited sulphur molecules emit light at 394 m wavelength which can be measured on a spectrophotometer. Several devices such as the Meloy FPD use this technique to measure SO₂. Time response of these systems is fast ... and reliable, and thus these devices are becoming more commonly used in APM surveys. The device is a moderately expensive point monitor but can be used in a mobile mode.  1, fiche 1, Anglais, - flame%20photometric%20method

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