Abstract
Relative volatilization loss rates for several different chemicals, mostly pesticides, in binary mixtures were determined in a temperature controlled cabinet. In some cases the loss rates were affected by the other chemical in the pair; this occurred with mixtures of liquids and solids and with mixtures of chemicals whose vapour pressures differed by more than a factor of ten. These effects can readily be avoided and the results indicate that the measurement of relative volatilization rates can be used to determine vapour pressures to within a factor of 3 in the range 10 −4 to 0.2 Pa. The loss rates measured for certain chemicals in different experiments were consistent to within 11% suggesting that under the controlled conditions used the reference compound does not need to be present in a mixture and the chemicals could be exposed singly if this were preferable.
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