【摘要】 研究发现在pH 5.2的邻苯二甲酸氢钾一氢氧化钠缓冲溶液中,Mn（Ⅱ）对过氧化氢氧化3-（4′-氯基苯基）-5-（2′-羧基偶氮）若丹宁的反应具有强烈的催化作用,并导致荧光强度的增加。据此建立了催化动力学荧光光度法测定痕量锰的方法,荧光强度的增加（ΔF）与Mn（Ⅱ）的质量浓度在0.014mg·L^-1以内呈线性关系,其线性回归方程为ΔF=-4.47+1038.75C,相关系数为0.9886,检出限为1.78×10^-6g·L^-1。用于自来水和污水样品中痕量锰的测定,测得结果与原子吸收光谱法（AAS）的结果相符。分析结果的相对标准偏差（n=6）均小于2.5%,用标准加入法测得的回收率在95.6%～103.4%之间。更多还原

【Abstract】 A catalytic kinetic fluorophotometric method for determination of trace amounts of manganese（Ⅱ） was proposed based on the catalytic effect of Mn（Ⅱ）on oxidation of the reagent mentioned in the title by H₂O₂ in a phthalate buffer medium of pH 5.2.The resulting increase in intensity of fluorescence（△F）was measured at the wavelengths(λ_ex/λ_em)308 nm/404 nm.Linear relationship between values of△F and concentration of Mn（Ⅱ）was obtained in the range within 0.014 mg·L^-1as shown by the linear regression equation△F=-4.47+1 038.75 C, where C is the concn.of Mn（Ⅱ）in 10 mL of solution（r=0.988 6）.Detection limit of the method was found to be 1.78×10^-6g·L^-1.The proposed method was applied to analysis of samples of tap water and sewage,giving results in consistency with the results obtained by AAS.Values of RSD’s（n=6）calculated from the analytical results were less than 2.5%.Test for recovery was made by standard addition method,and the results obtained were in the range of 95.6%-103.4%.更多还原