对氨基苯磺酸氧化化学发光反应的研究及应用——测定痕量钴

The Chemiluminescence of the Oxidization of p-Aminobenzene Sulfonic Acid and Its Application--Determination of Trace Amounts of Cobalt

研究了对氮基苯磺酸在金属离子钻(Ⅱ)作为催化剂存在下,在碱性溶液中被过氧化氢氧化的化学发光行为,测定了发光光谱,最大发射波长为445 nm.基于钻(Ⅱ)的催化作用建立了分析采量钻的化学发光新方法,其线性范围为5.0×10^(-11)～5.0×10^(-7)g/mL,检出限为0.01ng/mLGo^(2+),具有较好的选择性,通过对化学发光反应产物及有关反应试剂的紫外、红外和荧光光谱的测定研究,提出了氧化发光反应的机理,还对发光猝灭作用进行了讨论。

The present paper contains the reaction of reagent p-aminobenzene sulfonic acid with hydrogen peroxide in the presence of cobalt (Ⅱ) as a catalyst in an alkaline solution to produce chemiluminescence. The chemiluminescence spectrum was recorded with a WP4 optical spectrophotometer, which shows that the maximum emission wavelength is 445 nm. Based on the catalysis of cobalt ions, the chemiluminescent method for the determination of trace .cobalt was established. The concentration range of linear response is 1.0×10-11 g/mL to 5.0×10-7 g/mL, the detection limit is 0. 01 ng/mL Co2+, and the method has a good selectivity. Having determined and studied the UV, IR and fluorescence spectra of the product of the chemiluminescence reaction and some reaction reagents, we discussed the mechanism of this chemiluminescence reaction. In addition, the effect of quenching on the chemiluminescence system was discussed briefly.