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Ultraviolet spectrophotometry of content of petroleum in soil

A determination method and spectrophotometric technology, applied in the measurement of color/spectral characteristics, etc., can solve the problems of different petroleum compositions, different measurement results and actual results, etc.

Inactive Publication Date: 2010-07-14
OCEAN UNIV OF CHINA
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  • Claims
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Problems solved by technology

Theoretically speaking, there are two problems in the traditional UV spectrophotometry: one is that the composition of the so-called standard oil product (No. 15 motor oil and No. 20 heavy diesel oil) and the oil product to be tested is different (the content of polycyclic aromatic hydrocarbons is inconsistent), Therefore, the measurement results are different from the actual results; the second is that the oil is differentiated in the solid phase (soil), that is, the dissolved oil is a low-carbon petroleum hydrocarbon, and the petroleum pollutants remaining in the soil are relatively high-carbon petroleum hydrocarbons, making this Composition of petroleum in both media differs from standard oil

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  • Ultraviolet spectrophotometry of content of petroleum in soil
  • Ultraviolet spectrophotometry of content of petroleum in soil
  • Ultraviolet spectrophotometry of content of petroleum in soil

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] An embodiment of an ultraviolet spectrophotometric method for determining oil content in soil, comprising the steps of:

[0027] ①Preparation of standard oil: Pour excess No. 20 diesel oil produced in the area where the test soil is located (Daqing) into a bucket filled with water, stir it with a wooden stick, and let it stand for 48 hours. Then, put the oil dissolved in water Use petroleum ether to extract in a separatory funnel, pour the water sample into the separatory funnel, add 10 grams of sodium chloride, then take 25 milliliters of petroleum ether to rinse the sampling bottle, pour it into the separatory funnel, and shake it fully for 2 Minutes, and pay attention to deflate, let it stand for stratification, put the lower layer of water sample back into the sampling bottle, put the upper layer of organic phase into the conical flask, then pour the lower l...

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Abstract

The invention provides an ultraviolet spectrophotometry of the content of petroleum in soil. The method comprises the following steps: 1. preparing standard petroleum; 2. preparing purified petroleum ether; 3. weighting 15-25g of fresh soil in a beaker, adding 0.5-0.7ml of hydrochloric acid (1:1) for acidification, mixing, then adding 20-30g of a dry sample of MgSO4.H2O, then performing Soxhlet extraction with chloroform, after reflux, reclaiming chloroform, wherein residue is used as a standby for ultraviolet measurement; 4. weighting 5-10ml of petroleum ether to dissolve the residue, using petroleum ether as reference to place in a quartz cuvette, using a ultraviolet spectrometer to scan within 201-270mm, quantitatively comparing the absorbance of petroleum ether in 256nm of wavelength with that of the standard series of residual petroleum to calculate the content of petroleum; 5. drawing a standard curve; and 6. calculating the petroleum content of soil. The method of the invention avoids the influence of solid-phase differentiation on the measurement result of petroleum so that all the petroleum test data have comparability and the test accuracy is increased.

Description

technical field [0001] The invention relates to a method for analyzing oil content in soil environment, in particular to an ultraviolet spectrophotometric method for measuring oil content in soil. Background technique [0002] Traditionally, crude oil and petroleum products are collectively referred to as petroleum. In terms of material composition, petroleum mainly refers to hydrocarbons composed of alkanes, naphthenes and aromatic hydrocarbons. However, in oil-contaminated soil and water, in addition to petroleum hydrocarbons, it also contains non-hydrocarbon components such as animal and vegetable oils, surfactants, and other organic substances, and under certain conditions, these non-hydrocarbon oils and petroleum hydrocarbons will be organically absorbed together. Solvents are extracted from soil or water, requiring a revision of the theoretical concept of petroleum. Therefore, the "extraction of a certain organic solvent from different oily media" is called petroleum,...

Claims

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Application Information

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IPC IPC(8): G01N21/33
Inventor 郑西来姜鲁青孙娟梁春伍成成
Owner OCEAN UNIV OF CHINA
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