Abstract
AbstractSulphur dioxide is sorbed by paper and slowly converted to sulphuric acid; the presence of this severely reduces the useful life of the material. The sorption (‘pick‐up’) of sulphur dioxide has been investigated for a representative range of papers for exposures lasting many months at concentrations approaching those found in polluted urban atmospheres.It was found that the relative humidity does not significantly affect the long‐term pick‐up rate and that this rate remains constant for prolonged exposures, being proportional to the square root of the gas phase sulphur dioxide concentration. Rosin size increases markedly the long‐term rate while certain other paper additives, e.g. Turkey Red Oxide and Anatase, have no such effect.
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