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743nm和842nm处有较强光吸收,表观摩尔吸光系数分别是4.84×103L·mol-1·cm-1和8.82×103L·mol-1·cm-1.在乙醇介质中,烟碱的浓度在3～35mg/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.
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 proposed method, the following results are obtained. The apparent molar absorptivity of the CT complexes at 743 nm is 4.84×(10~3) L·mol^(-1)·cm^(-1), and the apparent molar absorptivity of the CT complexes at 842 nm is 8.82×(10~3) L·mol^(-1)·cm^(-1). In the presence 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 a simple, sensitive and reproducible method for the determination of the nicotine in ethanol with satisfactory results.
出处
《吉林大学学报（理学版）》
CAS
CSCD
北大核心
2004年第2期287-289,共3页
Journal of Jilin University:Science Edition
基金
山东省教育厅自然科学基金(批准号:03C53).
