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The Eu--benzoylacetone (BM)--diphenylguanide(DPG)--Triton X-100 system, which has a strong fluorescence intensity, was studied. It was found that the fluorescence intensity can be greatly enhanced by Gd 3+ . The experiment showed that the fluorescence intensity of the system was a maximum under the following conditions: pH = 8.3 and the concentrations of Gd 3+ , BM and...