荷移光度法测定烟草中烟碱的含量

荷移光度法测定烟草中烟碱的含量

黄薇

山东枣庄师范专科学校化学系，枣庄 277160

收稿日期:2003-10-28 修回日期:1900-01-01 出版日期:2004-04-26 发布日期:2004-04-26
通讯作者: 黄薇

Determination of nicotine tobacco by charge-transferred spectral method

HUANG Wei

Department of Chemistry, Zaozhuang Teachers' College, Zaozhuang 277160, China

Received:2003-10-28 Revised:1900-01-01 Online:2004-04-26 Published:2004-04-26
Contact: HUANG Wei

摘要/Abstract

摘要： 研究了7，7，8，8-四氰基对二次甲基苯醌(TCNQ)与烟碱的荷移反应，确定了反应条件. TCNQ与烟碱形成络合物的反应在743 nm和842 nm处有较强光吸收, 表观摩尔吸光系数分别是4.84×10³ L· mol^－１·cm^－１和8.82 ×10³ L· mol^－１·cm^－１. 在乙醇介质中，烟碱的浓度在3～35 mg/L与吸光度关系符合朗伯-比尔定律；该方法重现性好、灵敏度高、操作简单，用于测定烟草中烟碱含量，精密度好，相对标准偏差为1.4%(n=9)，烟碱的回收率为98%～103%，结果令人满意.

关键词: 烟碱, 7，7，8，8-四氰基对二次甲基苯醌, 荷移反应, 分光光度法

Abstract: Based on the study of the reaction between 7,7,8,8-tetracyanoquino-dimethane(TCNQ) and nicotine in tobacco, a new method for determining nicotine in tobacco under optimized condition is proposed in this paper. Through the pr oposed method, the following results are obtained. The apparent molar absorptiv ity of the CT complexes at 743 nm is 4.84×10³ L·mol^－１ ·cm^－１, and the apparent molar absorptivity of the CT complexes at 842 nm is 8.82×10³ L·mol ^－１·cm^－１. In the prese nce of ethanol, Beer's law is obeyed in the range of 3~35 mg/L for nicotine. The relative standard deviation is 1.4%(n=9). The recovery is 98%～103%. The proposed method has been proved to be asimple, sensitive and reprodu cible method for the determination of the nicotine in ethanol with satisfactory results.

Key words: nicotine, 7,7,8,8-tetracyanoquinodimethane, charge transfer reaction, spectrophoto-metric method

中图分类号:

O657.3

黄薇. 荷移光度法测定烟草中烟碱的含量[J]. J4, 2004, 42(02): 287-289.

HUANG Wei. Determination of nicotine tobacco by charge-transferred spectral method[J]. J4, 2004, 42(02): 287-289.

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