Catalysis-fluorescence Determination of Trace Nitrite Based on the Oxidation of Acridine Orange by Potassium Bromate
BAO Suo-yan1 ，LIU Wei-jie1, 2，HU Han-fang1
1. College of Chemistry and Environment Science, Hebei University，Baoding 071002，China 2. Department of Chemistry，Handan Normal College，Handan 056004，China
Abstract：Acridine orange can be oxidized with discoloring and fluorescence quenching by potassium bromate in phosphoric acid medium, but the reaction rate is very low. The presence of trace nitrite can catalyze this reaction to improve the sensitivity of it apparently and to make the net fluorescence value of the system decrease greatly. Based on the above investigation, a new catalysis-fluorescence determination method of trace nitrite has been proposed. The method described is very sensitive and selective. The catalysis reaction is under the conditions of λeｘ/λem＝446/505 nm, 55 ℃ and 10 min for the reaction time. The method permits the existence of more than 20 common foreign ions. There isn’t interference by the same quantity of Fe3+, Br- and I-. The detection limit is 0.012 ng·mL-1. The linear range of determination is 0.05-5 ng·mL-1. The method has been used for the determination of trace nitrite in water and soil samples with satisfactory results.
鲍所言1，刘卫洁1，2，胡汉芳1 . 催化荧光法测定痕量亚硝酸根[J]. 光谱学与光谱分析, 2004, 24(03): 342-344.
BAO Suo-yan1 ，LIU Wei-jie1, 2，HU Han-fang1 . Catalysis-fluorescence Determination of Trace Nitrite Based on the Oxidation of Acridine Orange by Potassium Bromate . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2004, 24(03): 342-344.
[1] LIU Xi-dong，LIU Shao-pu(刘希东，刘绍璞). Chinese J. of Anal. Chem.(分析化学), 1998, 26(4): 491. [2] BAO Suo-yan et al(鲍所言等). Chinese J. of Anal. Chem.(分析化学)，1995, 23(2): 191. [3] YAN Jin et al(严 进等). Physical Testing and Chemical Analysis, Part B: Chemical Analysis(理化检验-化学分册)，2000, 36(11): 504. [4] ZHENG Zhao-sheng et al(郑肇生等). Chinese J. of Anal. Chem.(分析化学), 1992, 20(1): 91. [5] CHEN Lan-hua，CHEN De-quan(陈兰化，陈德权). Chinese J. of Anal. Chem.(分析化学), 1996, 24(7): 790.
