原子发射光谱法间接测定烟碱的研究

本文提出了测定烟碱的间接原子发射光谱分析新方法。根据在盐酸介质中，烟碱被质子化后能与雷氏铵盐定量形成难溶化合物的性质，将沉淀溶解后，用原子发射光谱法测定铬来间接测定烟碱的含是。实验中研究了沉淀反应的最佳酸度、雷氏铵盐用量及放置时间等条件，选择了最佳的沉淀溶解剂，考查了共存离子的影响及方法的回收率和精密度。用本法测定了烟叶和香烟样品中的烟碱的含量，结果与光度法比较一致。方法的相对标准偏差为３．１６％

Studies on the Indirect Determination ofNicotine by Atomic Emission Spectometry

A new procedure for the determinationof nicotine in tobacco or cigarette by indirectAES has been developed,In strongly acidicmidium,nicotine reacts with ammonium rei-neckate to give a precipitate at room temper-ature,then the precipitate is centrifuged,dis-solved in acetone,the organic substance isignited and the residue is dissolved in water,transferred quantitatively to a 25mL volu-metric flask and filled to volume.Finally theChromium in the aqueous solution is mea-sured by AES.The percent content of nico-tine in samples is calculated indirectly. Theaverage recovery is 96.7%(n=7, RSD=3.16%),The proposed method has beenused to determine nicotine in tobacco andcigarette. The results are in agreement withthose by spectrophotometric method.