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The ferrous thiocyanate colorimetric method is applicable to the determination of active oxygen in commercial synthetic rubbers if the reagent is made up in a mixed solvent comprising absolute ethanol and chloroform. Antioxidants 'used in commercial synthetics do not affect the results.

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Notes 627 excess of water is zero. The Gibbsian surface excess will be proportional to the difference between the area under the concentration curve and the area of the rectangle --0-s. For this case it is easy to see that, even though there is a surface layer of solute (positive adsorption at the interface), the Gibbsian surface excess may be positive, zero or negative depending on the concentrations in the double layer region below the interface. It is also plausible that changes in the bulk concentration will change the concentrations in this region, and thus change the surface excess, even though only slight changes occur in the outer ionic layer. Thus the apparent paradox of a surface deficiency and yet a surface tension less than that of water is readily understandable.