Abstract: A new fluorescent reagent, SPAEC, synthesized in our laboratory, has been used for determination of micro gallium and aluminum at optimal pHfrom 3. 8 or 4. 0 to 5. 5 with λ_ex/λ_exbeing 515/580 or 535(520)/575 nm, respectively. When the two ions coexist, they will behave as a mutual interference. Kalman filter, an important tool of chemometrics, is a first order recursive optimal filter for estimating true signal in the presence of noise and an effective mathematical algorithm in data-processing of analytical chemistry. Kalman filtering spectrofluorimetry was applied to resolution of the overlapping fluorescence peaks of aluminum and gallium chelating with SPAECat pH 4. 5 through some modes covering: (1) all peak scanning filtering, (2) selective scaning filtering and (3) sim-plized scanning filtering. The developed method was used for analysis of Al/Ga(1: 40-14 : 1) mixtures and considerably improved the selectivity of a high sensitive fluorimetric method showing a good prospect for trace analysis.

Key words: Fluorescent reagent SPAEC, Fluorescent chelate, Kalman filtering spectrofluorimetry, Fluorescent analysis of aluminum and gullium, Simultaneous determination of aluminum and gullium