NO_2^--I^-体系双波长紫外分光光度法测定痕量亚硝酸根  

Determination of Trace Amounts of Nitrite by Two-Wavelength Ultraviolet-Spectrophotometry with NO_2^--I^- System

作　　者：李建国[1] 史丽颖[1] 陆宗钰[1] 

机构地区：[1]苏州大学化学化工系,江苏省苏州市215006

出　　处：《光谱实验室》2002年第1期134-136,共3页Chinese Journal of Spectroscopy Laboratory

摘　　要：在稀盐酸介质中 ,亚硝酸根氧化碘化钾的反应产物 I-3 在 2 88nm和 35 2 nm处有两个强吸收峰。基于此建立了双波长紫外分光光度法测定痕量 NO-2 的新方法。该法简便、快速、选择性好 ,线性范围为 0— 0 .4μg/ m L,检出限为 3.4× 10 -9g/ m L。用于河水、井水、矿泉水中亚硝酸根的测定 。A new two wavelength ultraviolet spectrophotometric method for the determination of trace amount of nitrite was developed. It is based on the ultraviolet absorption of the reaction product of nitrite and potassium iodide. The linear range of determination is 0-0.4μg/mL,and the detection limit is 3.4 ×10 -9 g/mL.This method is simple,rapid and selective. It has been applied to the determination of trace nitrite in natural and mineral water with satisfactory results.

关 键 词：亚硝酸根 双波长紫外光度法 碘化钾 水 测定 痕量分析 

分 类 号：O661.1[理学—分析化学] O661[理学—化学]