本文研究了荧光新试剂水杨醛异烟酰腙与镓的荧光反应,用紫外光谱法测定了试剂离解常数。在此荧光体系中,荧光配合物λ_(ex)=395nm、λ_(em)=480nm。在pH3.8、60％(V/V)乙醇介质中,测定的线性范围为0～1.0 μg/10mL,方法灵敏度为4×10~(-4)ppm。用荧光法测定了配合物的组成比及表观稳定常数。建立了镓的新荧光光度法,将其用于地质样品分析,精密度和准确度良好。 In this paper, the fluorescence reaction of salicylaldehyde isonicotinylhydrazone with gallium was studied. The dissociation constant of the reagent was determined by UV spectrophotometry. In this fluorescence system, the fluorescence complex λ_ (ex) = 395nm, λ_ (em) = 480nm. The linearity range was 0-1.0 μg / 10 mL in the medium of pH 3.8, 60% (V / V) ethanol and the sensitivity was 4 × 10 -4 ppm. The composition ratio and apparent stability constant of the complex were determined by fluorescence method. A new fluorescence spectrophotometry for gallium has been established, which is used for geological sample analysis with good precision and accuracy.