碘化物-罗丹明B体系荧光猝灭反应测定痕量亚硝酸根

Determination of Trace Nitrite Based on Fluorescence Quenching With I--Rhodamine B System

拟定了一个荧光猝灭法测定痕量亚硝酸根的新方法。在盐酸介质中，亚硝酸根氧化 碘化钾的反应，其反应产物Ｉ３－使罗丹明Ｂ荧光猝灭。方法的检出限为３．６μｇ／Ｌ；测定范围为 １０～１２０μｇ／Ｌ。方法简便快速、选择性好，用于自来水，矿泉水及合成样品中亚硝酸根的测定， 结果满意。

A new fluorimetric method for the determination of trace amounts of nitrite is pro- posed. The method is based on the fluorescence quenching of rhodamine B by the reaction product of nitrite and potassium iodide. The detection limit is 3. 6 μg/L. The linear range of determination is 10-120 μg/L. This method is simple, rapid and with good selectivity. It has been applied to the determination of trace nitrite in natural and mineral water with satisfactory results.