Fluorimetry determination of trace Ce3+ with EDTP

The use of ethylenediaminetetrakis(methylphosphonic) acid (EDTP) in the flu orimetry determination of trace amounts of Ce3+ ions is described. The fluo rescence intensity of Ce3+ was greatly enhanced when an 1:1 complex with ED TP in solution of pH 7-8 formed. The apparent excitation and emission wavel ength used were 313 and 397 nm, respectively. The fluorescence intensity va ried linearly with the concentration of Ce3+ in the range of 1 x 10(-8)-1 x 10(-4) mol 1(-1). The quenching effects of coexist ions (other rare earth ions, Fe3+ and some inorganic anions) were studied. This technique has uniq ue advantage in eliminating disturb of coexist. (C) 2000 Elsevier Science B .V. All rights reserved.