Determination of lead, manganese, magnesium, zinc and copper in aviation kerosene by flame atomic absorption spectrometry
DENG Dong-li1,2,LI Fen1,XIANG Min-jie1,WU Yi3,DENG Hao4
1.Faculty of Chemical and Pharmaceutical Engineering,Chongqing Industry Polytechnic College, Chongqing 401120,China; 2.College of Resource and Environment,Southwest University, Chongqing 400716,China; 3.Chongqing Shalegas Research Center of State Key Laboratory of Petroleum Resource and Prospecting, Chongqing 400042, China; 4.China National Aviation Fuel Supply Corporation Ltd. Chongqing Branch, Chongqing 401120,China
Abstract：The oil samples were flammable and combustible. As a result, it is easy to loss for low content metal elements in the analysis process. In addition, the direct determination could not be realized in common sampling system. Therefore, the pretreatment process of sample was very important for determination. 100 mL of aviation kerosene was sampled into 500 mL separatory funnel. Then, 2.0 mL of iodine-dimethylbenzene solution and 15 mL of nitric acid (1+9) were added for extraction twice. The extract liquor in two extraction operations was mixed followed by extraction with 10 mL of water. After concentration, the final extract liquor was determined by flame atomic absorption spectrometry (FAAS). Consequently, a determination method of five elements in aviation kerosene including lead, manganese, magnesium, zinc and copper was established. The results showed that the correlation coefficients of calibration curves of five elements above were all higher than 0.999 0. The detection limits of method were between 0.009 μg/mL and 0.256 μg/mL. The aviation kerosene sample was determined according to the experimental method. The results were basically consistent with those obtained by inductively coupled plasma atomic emission spectrometry (ICP-AES). The relative standard deviations (RSD, n＝9) were between 0.86% and 5.4%. The proposed method was applied to the determination of lead, manganese, magnesium, zinc and copper in aviation kerosene samples from four producing areas. The recoveries of standard addition were between 96% and 103%.
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