The use of naphthalene derivatives in inorganic analysis : Part IV. The nitronaphthylamines as fluorimetric reagents for stannous tin

Thirteen of the theoretically possible fourteen nitronaphthylamines have been tested and found to be of use as fluorimetric reagents for stannous tin. The presence of strong hydrochloric acid in the reagent solution is necessary for maximum sensitivity of test. This indicates that the nitronaphthylamines are not as versatile as their corresponding nitroaminonaphthalene monosulphonic acids as reagents for tin. Present evidence confirms the original postulate that the species responsible for the fluorescence is the excited state of the naphthylammonium ion.