Pretreatment method for determination of aromatic hydrocarbon substances in oil-gas geochemical prospecting sample in sulfur-containing area
A technology for oil and gas and samples, applied in the field of experimental testing, can solve problems such as unusable chemical reactions, and achieve the effect of eliminating ultraviolet fluorescence pollution and maintaining uniformity
Inactive Publication Date: 2020-04-17
XIAN CENT OF GEOLOGICAL SURVEY CGS
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[0009] Due to the chemical and physical properties of elemental sulfur, there are many chemical reactions with elemental sulfur, but the detection method in this field uses n-hexane as a solvent, with a boiling point of 67°C, and violent chemical reactions cannot be used
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[0029] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0030] The application principle of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0031] figure 1 It is a pretreatment method for the determination of aromatic hydrocarbons in oil and gas geochemical exploration samples in sulfur-bearing areas provided by the embodiments of the present invention, including:
[0032] S101: Purification of copper powder: Both analytically pure and chromatographically pure copper powders available in the market can be used. The test found that the effect of analytically pure copper powder is better than that of chromatographically pu...
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The invention belongs to the field of experimental testing, and discloses a pretreatment method for determination of aromatic hydrocarbon substances in an oil-gas geochemical prospecting sample in a sulfur-containing area. The pretreatment method comprises the steps of purifying copper powder before use; taking a supernatant obtained by utilizing a national standard method, putting into a colorimetric tube, adding the purified copper powder, shaking up and oscillating, and standing; adding the purified copper powder again, shaking up and oscillating, and standing; and adopting centrifugal filtration or organic filter membrane filtration to eliminate adhesion of the copper powder to a cuvette. According to the invention, sulfur in a saturated elemental sulfur n-hexane solution can be completely removed through secondary sulfur removal of the copper powder, other ultraviolet and fluorescence pollution is not introduced, and the determination of the aromatic hydrocarbon substances is notaffected; the measured data is objective, that is, the obtained ultraviolet and fluorescence data can truly reflect the content of the aromatic hydrocarbon substances in an investigation area by eliminating interfering substance elemental sulfur; and the method is convenient to popularize, low in cost, easy to operate and convenient to popularize, and supplements the current national standard.
Description
technical field [0001] The invention belongs to the field of experimental testing, and in particular relates to a pretreatment method for the determination of aromatic hydrocarbons in oil and gas geochemical exploration samples in sulfur-bearing areas. Background technique [0002] Aromatic hydrocarbons in oil and gas earth samples are currently determined by fluorescence spectrophotometer and ultraviolet spectrophotometer according to the provisions of "Measurement Methods for Oil and Gas Geochemical Exploration Samples" (GB / T 29173-2012). [0003] The national standard stipulates the pretreatment method of the sample: Weigh 20.0g of the sample with a particle size of 0.176mm, place it in a 60mL Erlenmeyer flask with a stopper, add 30mL of petroleum ether, shake well, and shake it in a shaker for 20min. Stand for more than 12h, then shake for 20min, let stand for 1h, and clarify. The supernatant was transferred to a 20mL stoppered test tube, and 0.5g of anhydrous sodium su...
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IPC IPC(8): G01N1/34G01N21/64G01N21/33
CPCG01N1/34G01N21/643G01N21/33G01N2021/6432
Inventor 李忠煜周宁超李艳广程秀花
Owner XIAN CENT OF GEOLOGICAL SURVEY CGS