Sec. 18.3] TREATMENT OF T1SSUEF0R RECOVERY OF RADIOISOTOPES 449 



peroxide, or perchloric acid have been successfully applied in wet-ashing 

 procedures and are to be preferred whenever the introduction of excess 

 sulfuric acid or sulfates is disadvantageous. 



Extensive work has been carried out by Smith [5] and by Kahane [6] on 

 the use of perchloric acid for the digestion of organic material. The former 

 author's publication includes a review of the literature through 1940 and a 

 compilation of some of the more important procedures employing this 

 reagent in conjunction with sulfuric and with nitric acid. 



REFERENCES FOR CHAP. 18 



1. Hawk, P. B., B. L. Oser, and W. H. Summerson: "Practical Physiological Chemistry," 

 12th ed., p. 987, The Blakiston Company, Philadelphia, 1947. 



2. Hawk, P. B., B. L. Oser, and W. H. Summerson: "Practical Physiological Chemistry," 

 12th ed., p. 451, The Blakiston Company, Philadelphia, 1947. 



3. "Methods of Analysis," 6th ed., p. 237, Association of Official Agricultural Chemists, 

 Washington, D. C, 1945. 



4. "Methods of Analysis," 6th ed., p. 238, Association of Official Agricultural Chemists, 

 Washington, D. C, 1945. 



5. Smith, G. F.: "Mixed Perchloric, Sulfuric and Phosphoric Acids and Their Application 

 in Analysis," 2d ed., G. Frederick Smith Chemical Co., Columbus, Ohio, 1942. 



6. Kahane, E.: "L'Action de l'acide perchlorique sur les matieres organiques," Vols. 

 I and II," Herman et Cie, Paris, 1934. 



