【摘要】 研究了以NTA为活化剂,CTMAB增敏,Mn(Ⅱ)催化KIO4-氧化7-(2-硝基-4-甲基苯偶氮)-8-羟基喹啉-5-磺酸(简称7P8Q5S)的反应,建立了催化光度法测定痕量锰的新方法,以509 nm为测定波长,Mn(Ⅱ)在0~3.2×10-9g.mL-1的范围内成线性关系,检出限为3.8×10-11g.mL-1,考察了20多种共存离子的影响,用于测定大米、绿豆、小米和土壤中的锰。更多还原

【Abstract】 A new catalytic spectrophotometric method for the determination of trace amount of Mn（Ⅱ） was developed.The method is based on the oxidation of 7-（2-nitryl-4-methyl phenylazo）-8-hydroxy-qinolin-5-slfonic acid by potassium periodate in the presence of nitrilo triacec acid as an activator and CTMAB as a sensitizer.The wavelengths for the determination was 509 nm.The linear range of determination is 0-3.2×10^-9 g·mL^-1 for Mn（Ⅱ）.The determination limit is 3.8×10^-11 g·mL^-1.The interference of foreign ions was studied.The method can be used for the determination of Mn（Ⅱ） in mung bean,rice,cereal and soil samples.更多还原