Brown (1) recently reported that swelling bentonites fluoresce under ultra violet light when moistened with a water solution of zinc uranyl acetate, but that non-swelling bentonites fluoresce only slightly, or not at all. He explained the cause of fluorescence as due probably to the dehydrating powers of clay involving free energy levels of the order chemisorption. He also stated that the sodium ion might play a considerable, but undetermined part in the effect. The writers have found that the sodium ion (exchangeable base) is the dominant cause.

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