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A new sensitive chemical actinometer - II. Potassium ferrioxalate as a standard chemical actinometer
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1956
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Earlier studies of potassium ferrioxalate photolysis in acidified solutions have been extended, providing a detailed investigation of its use as a chemical actinometer. Quantum efficiencies of potassium ferrioxalate were measured at twelve wavelengths (254–578 nm) under varying temperature, light intensity, and photolyte composition, with independent validation against uranyl oxalate and a calibrated thermopile, and detailed operating instructions were supplied. The study concludes that potassium ferrioxalate is a highly valuable chemical actinometer and recommends its use over uranyl oxalate for many applications.
The earlier experiments with potassium ferrioxalate have been extended and a detailed study has been made of the photolysis of the acidified solutions previously recommended for chemical actinometry (Parker 1953). Accurate values of quantum efficiency have been determined at twelve wavelengths between 254 and 578 m μ , and the effect of temperature, light intensity and of photolyte composition have been investigated. At some wavelengths independent values of quantum efficiency have been obtained by comparison with uranyl oxalate and by direct comparison with a calibrated thermopile. The results indicate that potassium ferrioxalate provides a very valuable new chemical actinometer, and its use is recommended in place of uranyl oxalate for many purposes. Full working details for the use of the actinometer are provided.