Method for measuring trace elements in petroleum by using ICP-MS

Abstract

The invention provides a method for measuring trace elements in petroleum by using ICP-MS. A high-temperature and high-pressure closed digestion tank method is used in sample pretreatment. The methodfor measuring the trace elements in the petroleum by using the ICP-MS has the advantages of low acid content, low background, simple operation and the like. The risks of tank-overflow and tank-explosion are greatly reduced through a thermal exhaust method. Special acid-proof coating treatment is carried out on a steel sleeve, and the risk of contaminating a sample is greatly reduced. After the pretreatment, an nitric acid solution and a hydrofluoric acid solution are used for preparing standard solutions of the each trace element; the prepared standard solutions of the each trace element are put into the ICP-MS in sequence to obtain a required standard curve; and a blank sample solution and a sample solution to be detected are separately put into the ICP-MS to obtain a working curve, and aconcentration value of the each trace element is obtained and the final content is calculated according to the working curve. The detection method is simple and economical, and has a wide applicationrange, and the detection result is accurate and reliable.

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...

AI Technical Summary

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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