A Method for Determining Trace Elements in Petroleum Using ICP-MS

Abstract

The invention provides a method for measuring trace elements in petroleum by using ICP-MS. In the sample pretreatment, a high-temperature, high-pressure closed digestion tank method is used, which has the advantages of less acid consumption, low background, and simple operation. The gas method greatly reduces the risk of overflowing and bursting tanks. After the steel sleeve is treated with a special acid-proof coating, the risk of sample contamination is greatly reduced. After the pretreatment, the standard solution of each trace element was prepared with nitric acid solution + hydrofluoric acid solution; the prepared standard solution of each trace element was sequentially entered into ICP‑MS to obtain the required standard curve; the blank sample The solution and the sample solution to be tested enter the ICP-MS respectively to obtain the working curve, and the concentration value of each trace element is obtained according to the working curve and the final content is calculated. The detection method provided by the invention is simple and economical, has a wide application range, and has accurate and reliable detection results.

Description

technical field [0001] The invention relates to a method for detecting trace elements in petroleum, in particular to the digestion of petroleum samples by a high-temperature and high-pressure digestion tank method and a method for determining trace elements in petroleum by using ICP-MS. Background technique [0002] At present, there are more than 40 kinds of trace elements found in petroleum, including alkali metals and alkaline earth metal elements such as Na, K, Ca, Mg, Ba; transition elements V, Ni, Fe, Cr, Mo. Other metal elements Cu, Pb, Ti, Co, Zn, Al, Cd, Cr, Mn, Ag, Sn, etc.; non-metal elements Cl, Br, Si, P, As, etc. Statistics on the content of trace elements in petroleum, their existing forms, origins, and different proportions of elements can be used as a reference for the classification of crude oils from different oil sources and origins; It provides a favorable basis for removing metals in the refining process. The existence of certain trace elements in pet...

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Problems solved by technology

However, this patent can only detect rare earth elements in petroleum, and the detection area is limited, so it cannot detect all trace elements in petroleum.

At the same time, in this patent, due to the column separation, the other elements in the sample except rare earth elements are lost to varying degrees, and the samples after column separation have lost the significance of detecting trace elements (except rare earth elements)

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