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| Determination of Nickel Content in Crude Oil by ICP-AES and Evaluation of Uncertainty |
| WANG Peng, ZHAO Rong-lin, LING Feng-xiang, WANG Shao-jun |
| Dalian Research Institute of Petroleum and Petrochemicals, SINOPEC, Dalian,Liaoning 116045, China |
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Abstract The content of nickel in crude oil was quantitatively analyzed by inductively coupled plasma emission spectrometry (ICP-AES), and the uncertainty analysis method was established. The contribution of uncertainty component was evaluated from four aspects, and its relative standard uncertainties were calculated respectively. Finally, the synthetic standard uncertainty and expanded uncertainty were obtained. Through analysis and calculation, the expanded uncertainty is 0.20 mg/kg (k=2) when the content of nickel in crude oil is 19.64 mg/kg. The results show that the mainly uncertainty influence factor is introduced by standard curve fitting and standard material itself, followed by solution preparation, while the contribution of sample weighing and measurement repeatability is small.
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Received: 06 December 2019
Published: 23 June 2021
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2021, Vol. 42 
