电感耦合等离子体质谱（ICP-MS）仪分析回收油脂 与食用植物油中27种元素含量的差异Difference of 27 elements in recycled oils and edible vegetable oils analyzed by inductively coupled plasma mass spectrometer (ICP-MS)

Abstract

利用电感耦合等离子体质谱（ICP-MS）仪对回收油脂与食用植物油中27种元素含量进行分析检测，了解回收油脂与食用植物油中27种元素含量的差异，以此鉴别回收油脂与食用植物油。采集合格食用植物油样品22份，回收油脂样品120份，经微波消解后，进入ICP-MS仪检测27种元素含量，结合偏最小二乘法判别分析进行元素差异分析，找出不同类型回收油脂与食用植物油的特殊差异元素。结果表明：Co、Cu、Fe、Na、Mn在未精炼回收油脂和食用植物油中的含量差异较大，可以作为鉴别未精炼回收油脂和食用植物油的指标元素；Fe、Cd两种元素在精炼回收油脂和食用植物油中的含量差异较大，可用于精炼回收油脂的鉴别；Cr、Cd、Ag、Ca、Pb、Hg、Al含量在不同颜色精炼回收油脂中有明显差异，可以此来指导回收油脂的进一步提炼，并根据其元素含量的高低用于生物原油等再利用。研究结果可为回收油脂与食用植物油的鉴别提供参考。 The 27 elements in recycled oils and edible vegetable oils were analyzed by inductively coupled plasma mass spectrometry (ICP-MS) to determine the differences in the 27 elements contents in recycled oils and edible vegetable oils, and identify recycled oils from normal edible vegetable oils. The samples of 22 qualified edible vegetable oils and 120 recycled oils were collected,and the contents of 27 elements were analyzed by ICP-MS after microwave digestion. The element content difference analysis was carried out using partial least squares discriminant analysis to identify specific elements between different types of recycled oils and edible vegetable oils.The results showed that Co，Cu，Fe，Na and Mn were very different between crude recycled oils and edible vegetable oils，which could be used to identify crude recycled oils. The contents of Fe and Cd were very different in refined recycled oils and edible vegetable oils, which could be used to identify refined recycled oils. The contents of Cr, Cd, Ag, Ca, Pb, Hg and Al were significantly different in refined recycled oils with different color，which could guide the further extraction and refining, and the reuse of crude bio-oil according to the level of its element content.The results could provide a reference for the identification of recycled oils from edible vegetable oils.

Keywords

• 回收油脂；食用植物油；icp-ms；元素；差异
• recycled oils; edible vegetable oils; icp-ms; element; difference