Air quality — Determination of mass concentration of sulphur dioxide in ambient air — Thorin spectrophotometric method
空气质素——环境空气中二氧化硫质量浓度的测定——钍试剂分光光度法
Applies to the range of 3,5 to 150 micrograms per cubic metre, 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.