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ISO 4221:1980
M00002995
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ISO 4221:1980 Air quality - Determination of mass concentration of sulphur dioxide in ambient air - Thorin spectrophotometric method
standard by International Organization for Standardization, 11/01/1980
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Applies to the range of 3,5 to 150 g/m3, assuming an air sample volume of 2 m3 and a sample solution volume of 50 ml. For higher concentrations, dilution of the sample may be necessary.