基于矿物元素分析对进口泰国、越南、柬埔寨香米产地的鉴定

目的 探讨泰国、越南、柬埔寨3国香米矿物元素含量差异,并对产地进行鉴别.方法 通过电感耦合等离子体质谱法(inductively coupled plasma mass spectrometry,ICP-MS)测定泰国、越南、柬埔寨3国75份香米中Cr、Ni、Cu、Zn、As、Se、Cd、Hg和Pb 9种矿物元素含量,...

Identification of the origin of imported fragrant rice from Thailand, Vietnam and Cambodia based on the analysis of mineral elements

Objective The purpose of this study was to research the differences of fragrant rice mineral element content from Thailand, Vietnam and Cambodia and to identify the origin of fragrant rice. Methods The 9 elements of Cr, Ni, Cu, Zn, As, Se, Cd, Hg and Pb of 75 samples of aromatic rice from Thailand, Cambodia and Vietnam were determined by inductively coupled plasma-mass spectrometry (ICP-MS). The results were analyzed by difference analysis, correlation analysis, principal component analysis and fisher discrimination. Results Pb was undetected in all samples. The six elements of Ni, Cu, Zn, As, Se and Cd have significant differences among different countries (P<0.05), and Cu has extremely significant differences among the three countries (P<0.01). There was a certain correlation between the six elements, and two principal components were extracted, The cumulative variance contribution rate was 71.334%.It was determined that Cu, Ni and Se were the characteristic factors that caused the difference of mineral elements in fragrant rice from different producing areas. Through Fisher discrimination to establish a traceability model, the analysis results show that the accuracy of discrimination for Vietnam training and verification set is 100%, and the discrimination accuracy for fragrant rice in Thailand and Cambodia training set is above 70% ,and verification set is 80%. Conclusion The fisher discrimination can be used to effectively identify fragrant rice from Cambodia, Thailand and Vietnam.