催化动力学光度法测定痕量锰

Catalytic Spectrophotometic Determination of Trace Manganese

在活化剂氨三乙酸存在下，基于锰（Ⅱ）催化高碘酸钾氧化亮绿SF的反应，建立了测定痕量锰（Ⅱ）的催化动力学光度法。在优化的实验条件下，测定锰（Ⅱ）的线性范围为0．6～6．0ng／mL，检出限为6．0×10^-11g／mL，相对标准偏差为2．5％（n=9）。该法灵敏度高，选择性和重现性较好，已用于测定饮用水和葡萄酒试样中的痕量锰。

A new kinetic spect been described. The method rophotometric method for the determination of trace amount of Mn（ Ⅱ ） has is based on a new indicator reaction of Mn calalyzing oxidation of Light Green SF by potassium periodate in the presence of nitrilo triacetic acid as an activator. The reaction is monitored spectrophotometically by measuring the absorbance decrease at 650 nm. The linear range for Mn（Ⅱ） is 0. 6-6 ng/mL, and the detection limit is 6. 0 × 10^- 11 g/mL. The method is of high sensitivity, selectivity and simplicity. The method has been used to determine trace Mn in water and wine samples with satisfactory results, and the RSD is 2.5% （n=-9）.