电感耦合等离子体质谱在白酒检验中的应用研究

Application of ICP-MS in Liquor Examination

目的为了准确检验和区分不同的白酒,利用电感耦合等离子质谱法同时定量检测白酒中多种微量元素,根据多个元素含量参数对白酒样品进行分类,以实现对不同白酒的有效区分。方法在优化的ICP-MS检测条件下,用标准溶液建立7Li、39K、51V、63Cu、75As、88Sr、208Pb 7种元素在确定范围内的标准工作曲线。用移液枪取待测白酒样品20m L于烧杯中,加热挥发至一定量后,用光谱纯硝酸消解,超纯水定容,然后用ICP-MS进行检测。利用所建立的标准工作曲线,计算出白酒中这7种元素的含量。结合21种常见白酒中不同元素的含量和ICP-MS方法参数,将不同元素含量划分为不同的区间范围,并根据不同白酒中元素含量对其进行归类编码。结果将每种元素的含量范围划分为4个区间范围,分别记为A、B、C、D,并根据白酒中7Li、39K、51V、63Cu、75As、88Sr、208Pb 7种元素的含量所在的区间范围确定该种白酒的7位编码,通过比对21种常见白酒的编码,可以清晰准确地将这些白酒进行区分。结论本文所采用的ICP-MS方法精密度好、可同时对多种元素进行定量检测,结合白酒中多元素含量分类方法,能够准确区分不同种类的白酒,因此可以广泛地应用于假冒伪劣白酒的检验鉴定。

Objective As the cases about manufacturing and selling fake and shoddy liquor increase, examination and identification of different liquor precisely is becoming an important technical support to crack down on such illegal and criminal activities. Inductively coupled plasma mass spectrometry（ICP-MS） is highly sensitive and has low detection limit（ppb level or even lower） and capability of simultaneous multi-element determination. Therefore, this paper tried to quantitate multi-trace-elements in liquor simultaneously by inductively coupled plasma mass spectrometry, and to establish a method for classifying or even identifying different kinds of liquors according to their multi-element content parameters. Methods Under the optimized condition of ICP-MS, we established the standard working curve of 7Li, 39 K, 51 V, 63 Cu, 75 As, 88 Sr, 208 Pb with their standard solution. For the liquors to be examined, pipetting 20 m L into a beaker and heating and evaporating to certain volume, digesting with nitric acid（spectrum pure）, transferring to the volumetric flask and diluting with ultrapure water to the volume, and then analyzed by ICP-MS. Results The content of each elements in the liquor was calculated by the standard working curve method. The contents of the 7 kinds of element were divided into four ranges, coded as A, B, C, D, respectively. 21 kinds of common liquors was coded according to their 7Li, 39 K, 51 V, 63 Cu, 75 As, 88 Sr, 208 Pb level and the corresponding content ranges. Each of these liquors obtained a seven-letters code, and it was easily to distinguish them from each other accurately according to their seven-letters code. Conclusions The ICP-MS method established in this paper is sensitive, accurate, and capable of simultaneous multi-element determination. Combining ICP-MS quantitation method and multi-element content classifying method, different kinds of liquor could be identified accurately. These methods can be widely used in liquor examination.