Analysis of Trace Inorganic Elements in Castor Oil by Inductively Coupled Plasma Mass Spectrometry
LI Tan-ping1, XIE Hua-lin2*, NIE Xi-du1
1. Department of Material and Chemical Engineering, Hunan Institute of Technology, Hengyang 421002, China 2. College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing 408100, China
Abstract:A method for the determination of Na, Mg, Si, P, K, Ca, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Se, Sr, Mo, Cd, Hg and Pb in castor oil after direct dilution with ethanol by inductively coupled plasma mass spectrometry (ICP-MS) was established. The sample was diluted by ethanol before ICP-MS determination. The condensation and deposition of high concentrations of carbon in mass cone interface and ion lens, which will decrease the sensitivity of element analysis, were avoided effectively by introducing O2 to plasma. The mass spectral interferences were eliminated by octopole reaction system (ORS). The matrix effects were calibrated to using Sc, Ge, Rh and Ir as internal standard elements. Au standard solution, which could form amalgam alloy with Hg, was dropped to eliminate the memory effect of Hg. The results show that the correlation coefficient for analyte is no less than 0.999 5, the detection limits is in the range of 0.06~20.1 ng·L-1, the recovery is in the range of 990.4%~110.2%, and the RSD is less than 4.8%. This method was very fast, simple and accurate to simultaneously analyze multi-elements in castor oil.
Key words:Castor oil;Inductively coupled plasma mass spectrometry;Elements;Ethanol
李坦平1,谢华林2*,聂西度1 . 蓖麻油中无机元素的质谱分析 [J]. 光谱学与光谱分析, 2015, 35(10): 2882-2885.
LI Tan-ping1, XIE Hua-lin2*, NIE Xi-du1 . Analysis of Trace Inorganic Elements in Castor Oil by Inductively Coupled Plasma Mass Spectrometry . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2015, 35(10): 2882-2885.
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