【摘要】 采用溶胶-凝胶法制得平均粒径约10nm的SnO2粒子。将该纳米SnO2粒子加入碱性鲁米诺-O2化学发光体系,体系的化学发光强度明显增强,这种增敏作用与纳米SnO2的加入量以及体系中溶解氧的质量浓度有关,基于此得出了纳米SnO2存在下溶解氧质量浓度与鲁米诺化学发光强度之间的线性关系,可用于溶解氧测定,检出限达0.3mg/L,该纳米增敏化学发光体系有望用于进一步提高基于鲁米诺化学发光测定方法的灵敏度。文中还应用紫外-可见光谱和荧光光谱研究了这种增敏作用的机理,并应用该体系考察了水果的抗氧化能力。更多还原

【Abstract】 Nano-SnO2 particles were synthesized by the sol-gel method and characterized by transmission electron microscope(TEM).The average size of nano-SnO2 particle was about 10 nm.Experimental results showed that the chemiluminescence intensity of alkaline luminol-O2 system was increased greatly in the presence of these nano-SnO2 particles.The enhancement of chemiluminescence intensity was depending on the content of nano-SnO2 and dissolved oxygen.Based on this characteristic,a novel method was thus developed for the determination of the dissolved oxygen.A good linear relationship(r=0.999 6)was observed over the concentration of dissolved oxygen with a detection limit of 0.3 mg/L.The method was applied in the evaluation of the anti-oxidation abilities of some fruits.The mechanism of the enhanced chemiluminescence intensity of the system was also studied by the UV-Vis and fluorescence spectra.更多还原