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研究了三聚氰胺(MA)及其胺化衍生物在不同浓度酸碱溶液中的荧光性能,探索了MA及其衍生物与金属离子作用前后三维荧光光谱的变化规律。结果显示:酸性溶液中MA的荧光强度高于胺化衍生物,而碱性溶液中MA的荧光强度低于胺化衍生物;随着盐酸浓度加大,其荧光峰向长波方向移动,且荧光强度逐渐减小;随着氢氧化钠浓度增加,MA荧光强度逐渐减小,胺化衍生物在氢氧化钠浓度为0.001mol/L时荧光强度最小,浓度为0.01mol/L时达到最大。加入Ni~(2+)、Co~(2+)、Mn~(2+)、Ca~(2+)等金属离子后,MA及其胺化衍生物无响应;但加入Cu~(2+)和Pb~(2+)后,其荧光强度随着金属离子浓度的增大而减弱直至不再变化。并通过摩尔比法求得MA及其衍生物与Cu~(2+)和Pb~(2+)的结合比。
The fluorescence properties of melamine (MA) and its amination derivatives were studied in different concentrations of acid and alkali solutions. The changes of three-dimensional fluorescence spectra of MA and its derivatives before and after the interaction with MA and metal ions were investigated. The results showed that the fluorescence intensity of MA in acidic solution was higher than that of the aminated derivative, while the fluorescence intensity of MA in alkaline solution was lower than that of the aminated derivative. As the concentration of hydrochloric acid increased, the fluorescence peak of MA shifted to long-wave direction, The intensity of MA decreased gradually with the increase of sodium hydroxide concentration. The intensity of MA fluorescence decreased when the concentration of sodium hydroxide was 0.001 mol / L and reached the maximum at the concentration of 0.01 mol / L. After the addition of metal ions such as Ni 2+, Co 2+, Mn 2+, Ca 2+, the MA and its amination derivatives did not respond. However, adding Cu 2+ ) And Pb ~ (2+), its fluorescence intensity decreases with the increase of metal ion concentration until it no longer changes. The molar ratios of MA and its derivatives to Cu 2+ and Pb 2+ were determined by molar ratio method.