Arsonnic and Stibonic Acids derived from QuinoLine, etc. Part I . 433 99. Arsonic and Stibonic A c i d s derived from Quinoline and Acridine. Part I . By (Miss) MARY M. BARNETT, ARCHIBALD H. C. P. GILLIESON, and WILLIAM 0. KERMACK. FOR the preparation of 3-aminoacridone (I, R = NH,) in moderately large quantities the following two methods were found suitable : (1) 4'-Nitrodiphenylamine-2-carboxylic acid (Goldberg, Ber., 1906, 39, 1691) is reduced by ferrous sulphate and ammonia, and the resulting 4'-arninodiphenylamine-2-carboxylic acid heated with 96 yo sulphuric acid at 100" ( U h a n n and Bader, Annalen, 1907, 355, 335). (2) Condensation of o-bromobenzoic acid and P-aminoacetanilide in amyl-alcoholic solution in presence of potassium carbonate and copper powder yields 4'-acetamidodi~henylamine-2-carboxylic acid, from which 3-aminoacridone is readily obtained by treatment with 96% H,SO, at 100". 3-Aminoacridone is converted into acridone-3-arsonic acid (I, R = AsO,H,) by the Bart reaction under appropriate conditions, and into acridone-3-stibonic acid (I, R = SbO,H,) under the conditions described by Morgan and Cook (J., 1930, 743). * Wieland and Wiedersheim do not record a m. p. for this acid; our product did not depress the m. p. of a specimen, m. p. 186", very kindly supplied by Professor Wieland. EDINBURGH.[Received, J a ti uary 2 9 th, 1 93 4 .]

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Hematite ore fractions in the form of circulating slurries of various solids content were analyzed for iron and silicon, their principal metallic constituents, to determine the relationships and factors significant to such analyses. Radioisotopes were used to excite the characteristic radiations which were measured nondispersively. Counts were also taken for the exciting radiations. The measured intensities for Fe Kα and Si Kα were corrected by backscatter and absorption factors derived by the comparison of counts from the slurries to those from water. Regression lines were used to convert all counts to a 40% solid basis. The iron content of the ore fractions was determined with a standard error of less than 2%. The determination of silicon was not satisfactory at low concentrations because all components of the slurries absorb Si Kα strongly.

The factors involved in the correction of experimental results in the X Ray fluorescence analysis of high-temperature alloys are described and discussed. An empirical method for the mathematical correction of such results is detailed and the degree of correction assessed.