Determination of Pb Isotopes in Crude Oil by ICP-MS and Application in Identification of Oil Sources
详细信息
- 责任者：Li Jingxi (Marine Ecology Research Center ; First Institute of Oceanography ; State Oceanic Administration ; Qingdao 266061 ; China) ; Li Junfei
- 刊名：Rock and Mineral Analysis
- 出版年：2013
- 卷期：32(4)
- 关键词：原油 ; crude oil ; 铅同位素 ; lead isotopes ; ICP—MS ; inductively coupled plasma mass spectroscopy
- 页码：p.621-626
- 图表：illus., 6 tables, 20 refs.
- 分类号：0900
- issnNo：ISSN0254-5357
- isbnNo：CN11-2131/TD
摘要
Oceanic oil spill incidents occur from time to time making it extremely important to establish a new identification method based on Pb isotope information.This method involves dissolving the crude oil in organic solvent(CH2Cl2),which is a strong polar solvent,and then digesting by microwave with HNO3-H2O2 as the oxidant.The concentration and isotopic compositions of Pb(208Pb/206Pb,208Pb/204Pb and 208Pb/207Pb) were measured under the optimum conditions of Inductively Coupled Plasma-Mass Spectrometry(ICP-MS).The accuracy and precision were also studied.The results show that the method is accurate,with a relative error of less than 5%,and a precision with RSD less than 2%(n=3).The dwell time for different Pb isotopes was also optimized by using Pb standard solution in order to improve the accuracy and get the best integration time.The concentrations of Pb in crude oil from Bohai,Nanhai and other countries was measured,and the concentration range of Pb in all crude oil was 37.99-1213.00 μg/kg demonstrating obvious differences.Meanwhile,the ratios of different Pb isotopic compositions were measured and further processed by cluster analysis by taking 208Pb/207Pb and 208Pb/206Pb as independent variables.It could be seen that the crude oil from different areas can be classified,especially the Nanhai oil.The study could provide some assistance for other identification of oil sources by preliminary screening.
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