Abstract：The effective energy transfer of eosine Y-safranine T occurred in medium at pH 6.0 in presence of sodium dodecyl benzene sulfonate (SDBS), leading to the fluorescence enhancement of safranine T. The addition of manganese (II) resulted in the fluorescence quenching of safranine T at 577nm. The fluorescence quenching extent showed linear relationship with the content of manganese (II). On the basis of this phenomenon, a new method for determination of trace manganese by energy transfer fluorescence quenching was established. The following optimum conditions of this system were obtained: 0.5mL of 1.0×10-6 mol/L eosine Y solution, 4.0mL of 1.0×10-5 mol/L safranine T solution, 0.3mL of 1.0×10-3 mol/L SDBS solution, heating in thermostatic water bath at 40℃ for 4min. Under the optimized conditions, the mass concentration of manganese (II) in range of 0.4×10-8-6.0×10-8 mol/L showed linear relationship with the fluorescence quenching extent. The detection limit of method was 6.0×10-9 mol/L. The proposed system was applied for determination of manganese in tea and soil samples, and the relative standard deviations (RSD, n=11) were less than 5%, the recoveries were 93.8%-95.6%.
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