电感耦合等离子体质谱法测定食用植物油中的磷和硅

发布时间：2018-10-19 18:57

【摘要】：建立了电感耦合等离子体串联质谱(ICP-MS/MS)准确测定食用植物油中的P和Si的方法。以HNO_3+H_2O_2混合酸经密闭微波消解系统处理植物油样品,向碰撞反应池(CRC)中分别通入O_2和H_2,P与O_2反应,利用O_2质量转移,通过测定子离子~(31)P~(16)O~+测定P,而Si不与H_2发生反应,利用H_2原位质量反应消除质谱干扰,显著改善了分析结果的准确度。分别考察了不同O_2和H_2流速对~(31)P~(16)O~+和~(28)Si~+信号强度和背景等效浓度(BEC)的影响,确定了最佳O_2和H_2流速。在优化的条件下,测得~(31)P~(16)O~+和~(28)Si~+的检出限分别为0.043和0.66μg/L。采用本方法分析美国国家标准与技术研究院提供的标准参考物质润滑油(SRM 1848),结果表明,测定值与验证值无显著性差异。采用本方法分析来自中国不同产地的5种植物油(分别为油菜籽油、葵花籽油、花生油、玉米油和大豆油),结果表明,5种植物油中花生油的P含量最高,大豆油的Si含量最高。
[Abstract]:An accurate method for the determination of P and Si in edible vegetable oil by inductively coupled plasma tandem mass spectrometry (ICP-MS/MS) was established. The plant oil samples were treated with HNO_3 H_2O_2 mixed acid by a closed microwave digestion system, and then reacted with O _ 2 and O _ 2 respectively into the (CRC) of the collision reaction tank. The mass transfer of O _ 2 was used to determine the P ~ (31) P ~ (16) O ~, but the Si did not react with H _ (2). The H-2 in situ mass reaction was used to eliminate the mass interference and the accuracy of the analytical results was improved significantly. The effects of different O _ S _ 2 and H _ S _ 2 flow rates on the signal intensity and background equivalent concentration (BEC) of ~ (31) P ~ (16) O ~ and ~ (28) Si~ were investigated, respectively, and the optimum flow rates of O _ S _ 2 and H _ 2 were determined. Under the optimized conditions, the detection limits of ~ (31) P ~ (16) O ~ and ~ (28) Si~ were 0.043 and 0.66 渭 g / L, respectively. This method is used to analyze the standard reference material lubricating oil (SRM 1848) provided by the National Institute of National Standards and Technology. The results show that there is no significant difference between the measured value and the verification value. Five kinds of vegetable oils (rapeseed oil, sunflower oil, peanut oil, corn oil and soybean oil) from different producing areas in China were analyzed by this method. The results showed that the P content of peanut oil was the highest and the Si content of soybean oil was the highest.
【作者单位】：中南大学化学化工学院;长江师范学院化学化工学院;
【基金】：国家自然科学基金(No.21005089) 重庆市科委前沿与应用基础研究项目(No.cstc2015jcyj A10038) 重庆市教委重点科研项目(No.KJ1601224) 教育部"春晖计划"项目(No.Z2015142)资助~~
【分类号】：O657.63;TS225.1

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