Abstract
Three new reagents, viz 5-nitro-1-aminonaphthalene-2-sulphonic acid,4-nitro-1-aminonaphthalene-5-sulphonic acid and 4-nitro-1-aminonaphthalene-6-sulponic acid, have been found to be of use as fluorimetric spot tests on filter paper for stannous tin. The orientation of the sulphonic acid group does not appear to appreciably affect the sensitivity of the test, approximately one microgram of stannous tin being capable of detection by all isomers
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