电感耦合等离子体质谱法同时测定白酒中18种金属元素

Simultaneous determination of 18 kinds of mental elements in Chinese baijiu by inductively coupled plasma mass spectrometry

中文关键词:  白酒  离线内标  金属元素  电感耦合等离子体质谱法

英文关键词:Chinese baijiu  offline internal standard solution  metal elements  inductively coupled plasma mass spectrometry

中文摘要:

      目的 建立电感耦合等离子体质谱法同时测定白酒中Al、Ti、V、Cr、Mn、Fe、Co、Ni、Cu、As、Se、Zn、Mo、Tl、Sb、Cd、Ba、Pb 18种金属元素的分析方法。方法 样品白酒经水浴蒸干稀酸溶解法处理后, 采用离线引入内标, 在电感耦合等离子体质谱仪动能歧视消除模式(kinetic energy discrimination, KED)下测定18种金属元素的含量。结果 18种金属元素在一定浓度范围内线性关系良好, 相关系数均大于0.9995, 检出限为0.02~1.2 ng/mL, 回收率为98.6%～103.1%, 相对标准偏差小于3.68%。对桂林市66份散装白酒进行检测, 各元素限量基本符合生活饮用水卫生标准。结论 该方法具有灵敏快速、定量准确的特点, 适用于白酒产品的质量控制和检测分析。

英文摘要:

      Objective To establish a method for the determination of 18 kinds of metal elements Al, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, As, Se, Zn, Mo, Tl, Sb, Cd, Ba, Pb in Chinese baijiu by inductively coupled plasma mass spectrometry(ICP-MS). Methods After the sample liquor was processed by water bath evaporation and dilute acid dissolution, the internal standard was introduced offline, and the content of 18 metal elements was determined by ICP-MS in kinetic energy discrimination (KED) mode. Results The linear relationship of 18 metal elements in a certain concentration range was good, and the correlation coefficients were all greater than 0.9995. The limits of detection were 0.02–1.2 ng/mL, the recoveries were 98.6%–103.1%, and the relative standard deviations were less than 3.68%. The inspection of 66 bulk liquors in Guilin city, the limit of each element basically met the sanitary standard of drinking water. Conclusion This method is sensitive, rapid, quantitative and accurate, and is suitable for the quality control and detection of liquor products.