| 引用本文： |
-
唐宁莉,李旺明.亚硝酸根-中性红-8-羟基喹啉偶联反应光度法测定亚硝酸根[J].广西科学,2001,8(3):186-188. [点击复制]
- Tang Ningli,Li Wangming.Determination of Nitrite by Spectrophotometry on the Coupled Reaction of Nitrite-Neutral Red-8-hydroxyquinoline[J].Guangxi Sciences,2001,8(3):186-188. [点击复制]
|
|
| 摘要: |
| 研究中性红与亚硝酸根在盐酸介质中重氮化,然后在氨性溶液中与8-羟基喹啉偶联成黄褐色产物的反应。偶联产物的最大吸收波长在560nm,据此建立了一个简单、快捷、选择性较好的测定亚硝酸根的可见分光光度法。该法的摩尔吸光系数ε560=1.32×104L·mol-1·cm-1,测定的线性范围为0~880 μg/L。用于水样、食品、蔬菜样品中亚硝酸根的测定,结果满意。 |
| 关键词: 亚硝酸根 中性红 8-羟基喹啉 分光光度法 |
| DOI： |
| 投稿时间：2001-04-09修订日期：2001-06-06 |
| 基金项目: |
|
| Determination of Nitrite by Spectrophotometry on the Coupled Reaction of Nitrite-Neutral Red-8-hydroxyquinoline |
|
Tang Ningli, Li Wangming
|
| (Dept. of Material Eng., Guilin Institute of Tech., 12 Jianganlu, Guilin, Guangxi, 541004, China) |
| Abstract: |
| A new spectrophotometric method for the determination of nitrite was developed. In acidic solution, nitrite was first diazotized with neutral red, followed by coupling with 8 hydroxyquinoline to produce an azo-compound. This azo-compound has a maximum absorption at 560 nm. Beer's law is obeyed for nitrite in the range of 0 to 880 μg/L. The molar absorptivity is 1.32×104L·mol-1·cm-1.This method was used to determine trace nitrite in water of lake, flour and potato samples with satisfactory results. |
| Key words: nitrite neutral red 8-hydroxyquinoline spectrophotometry |
