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A reação fluorescente do glioxal-bis-(2-hidroxianil) (GBHA) com cádmio foi estudada. A partir dessa reação quelante, um método espectrofluorimétrico direto, sensível e rápido, para determinação de traços de cádmio com GBHA, foi desenvolvido. As condições reacionais para o sistema fluorescente de cádmio com GBHA foram estabelecidas. O íon cádmio pode formar um quelato estável com GBHA, à razão de 1:3 no intervalo de pH, entre 12,0 e 13,0. Para o quelato de cádmio, os comprimentos de onda máximos de excitação e emissão são 227,4 nm e 320,0 nm, respectivamente. A intensidade fluorescente do quelato de cádmio permanece estável entre 20 e 150 min. Sob condições experimentais ótimas, a intensidade fluorescente é uma função linear da concentração de cádmio, no intervalo entre 1,0 e 10,0 ng mL -1 e o limite de detecção é 0,65 ng mL -1 de cádmio. A influência de íons interferentes foi estudada. O método foi aplicado com sucesso na determinação de cádmio em águas de descarte. The fluorescent reaction of the reagent glyoxal-bis-(2-hydroxyanil) (GBHA) with cadmium was studied. Based on this chelation reaction, a sensitive, rapid, direct spectrofluorimetric method for the determination of trace cadmium with GBHA has been developed. The reaction conditions for the fluorescence system of cadmium with GBHA were established. The cadmium ion can form a stable chelate with GBHA, having a ratio of 1:3 in the 12.0 -13.0 pH range. The maximum excitation and emission wavelengths are 227.4 nm and 320.0 nm for the cadmium chelate, respectively. The fluorescence intensity of the cadmium chelate remains stable from 20 to 150 min. Under the optimal experimental conditions the fluorescence intensity is a linear function of concentration in the range 1.0-10.0 ng mL -1 of cadmium and the detection limit is 0.65 ng mL -1 of cadmium. Interferences of foreign ions were studied. The method has been successfully applied to the determination of cadmium in the sewage.

The application of glyoxal-bis-(2-hydroxyanil) to the determination of trace amounts of cadmium by spectrofluorimetry