Citation: FU Liang, SHI Shu-Yun. Determination of Phosphorus and Silicon in Edible Vegetable Oil by Inductively Coupled Plasma-Tandem Mass Spectrometry[J]. Chinese Journal of Analytical Chemistry, ;2017, 45(8): 1222-1226. doi: 10.11895/j.issn.0253-3820.170220 shu

Determination of Phosphorus and Silicon in Edible Vegetable Oil by Inductively Coupled Plasma-Tandem Mass Spectrometry

FU Liang ^1,2, ,
SHI Shu-Yun ¹

1.
School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;2 College of Chemistry and Chemical Engineering, Yangtze Normal University, Fuling 408100, China

Received Date: 3 April 2017
Revised Date: 3 May 2017

Fund Project: This work was supported by the National Natural Science Foundation of China (No.21005089)

An analytical method was developed for determination of P and Si in edible vegetable oil using inductively coupled plasma-tandem mass spectrometry (ICP-MS/MS). The microwave-assisted acid digestion of vegetable oil using HNO₃ + H₂O₂ was carried out in closed vessels. The mass spectral interferences were eliminated by O₂ mass shift when promoting reaction with O₂ inside the collision reaction cell (CRC), and the monitoring of P as ³¹P¹⁶O⁺ product ion significantly improved the accuracy of the analysis. H₂ was added into the CRC for H₂ on-mass reaction. The interferences were eliminated by the quadrupole analyzer to accurately identify ²⁸Si⁺. The effects of the flow rate of O₂ and H₂ in ORS3 on the signal intensities and BECs of ³¹P¹⁶O⁺ and ²⁸Si⁺ were investigated. The optimum O₂ and H₂ flow rate was determined. Under the optimized conditions, the limits of detection were 0.043 and 0.66 μg/L for ³¹P¹⁶O⁺ and ²⁸Si⁺, respectively. The accuracy of the analytical method was assessed by the analysis of the standard reference materials lubricant oil (SRM 1848) from the National Institute of Standard and Technology. No significant differences were observed between the certified values and measured values. This method was used to analyze 5 kinds of edible vegetable oils (rapeseed oil, sunflower oil, peanut oil, corn oil and soybean oil) from different regions of China, and it was found that the content of P was the highest in peanut oil, and Si showed the highest content in soybean oil.
- Edible vegetable oil,
- Inductively coupled plasma-tandem mass spectrometry,
- Silicon,
- Phosphorus
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