A simple and rapid method for the spectrophotometric determination of hydrogen peroxide using potassium titanium(1V) oxalate is described. The method can be used to measure peroxide concentrations down to about 10 p~hz (0.3mgkg-l) under the most favourable conditions. A variety of cornplexing and reducing agents, and catalysts of peroxide decomposition, known to interfere with the alternative iodide method for peroxide determination, had no effect. K e y w o r d s : H y d r o g e n peroxide determination; spectrophotounetry; titunium(I V )

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Pulse radiolysis of aqueous solutions of formic acid and formate ion in the pH range 0-13 shows (i) that the absorption spectrum of the carboxyl radical is constant between pH 2.5 and 13, but decreases in intensity between pH 2.5 and 0 ; (ii) that the effect of ionic strength on the rate of reaction of the radical with itself is the same at pH 2.7 and 7 and is consistent with the radical having unit negative charge at pH 2.7. The data presented indicate that the pK of the radical is 1.4.

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