ScienceAsia 8 (1982): 103-113 |doi: 10.2306/scienceasia1513-1874.1982.08.103

DESIGN AND CONSTRUCTI0N OF A PORTABLE SULPHUR DIOXIDE MONITOR

N. CHAIKUM^a and C. PHIBULSAWASDI^b

ABSTRACT: An investigation has been carried out on the colorimetric determination of sulphur dioxide, employing a starch-iodine-iodide solution. The accuracy and interferences in the determination are assessed. A portable sulphur dioxide monitoring instrument is developed and constructed. Sulphur dioxide measurements have been carried out during a period of two months at several locations in Bangkok.

     It is found that atmospheric sulphur dioxide concentrations ranged from 0.01 to 0.1 ppm in factory areas and from 0.02 to 0.09 ppm in. heavy traffic areas.

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a Department of Chemistry. Mahidol University. Rama 6 Road. Bangkok 4. Thailand and
b Department of Chemistry. Srinakharinwirot University. Soi Prasammitr. Sukhumvit. Bangkok. Thailand

Received 4 January 1981