Method for measuring content of humic acid in oil-containing sludge in oilfield
A determination method and humic acid technology, applied in the preparation of test samples, color/spectral characteristic measurement, etc., can solve the problems of cumbersome procedures, poor homogeneity, complicated operation, etc., and achieve broad application prospects and short test time , the effect of easy operation
Active Publication Date: 2017-08-15
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
The structure of oily sludge in oil fields is complex, oil, water, and sand are wrapped together, and there are also some oily colloids, waxes, asphaltene, and residual chemicals. The sludge has complex composition, high viscosity, agglomerates, different sizes, and poor homogeneity , leading to large differences between test samples
[0008] 2) The principle of measuring total carbon in the national standard method is not applicable to oily sludge in oilfields
Oilfield oily sludge contains a large amount of petroleum organic substances. If the petroleum substances are not removed before the measurement, the authenticity of the humic acid content measurement results will be seriously affected.
[0009] 3) The experimental process of the national standard method is complex, cumbersome, time-consuming and inefficient
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[0028] The present invention will be further described below in conjunction with specific embodiments.
[0029] 1. Reagent preparation
[0030] 1) 0.05mol / L sodium hydroxide solution: Weigh 2.0g of sodium hydroxide and dissolve in water, dilute to 1L;
[0031] 2) Sodium hydroxide (0.1mol / L)-sodium pyrophosphate (0.1mol / L) mixed extract (pH=13): Weigh 4.0g sodium hydroxide and 44.6g sodium pyrophosphate (with 10 crystal water) Soluble in water, dilute to 1L;
[0032] 3) 500μg / mL humic acid standard solution: Accurately weigh 0.2500g sodium humate (analytical pure) and dissolve it in 200mL-300mL0.05mol / L sodium hydroxide solution, and dilute to 500.0mL volumetric flask;
[0033] 4) Blank reference solution: 10.00mL 5mol / L sodium hydroxide solution;
[0034] 5) 10μg / mL, 20μg / mL, 30μg / mL, 40μg / mL, 50μg / mL humic acid standard solution: accurately pipette 200μl, 400μl, 600μl, 800μl, 1000μl sodium humate with an adjustable volume pipette Put the standard solution in a 10.00mL vo...
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Abstract
The invention discloses a method for measuring the content of humic acid in oil-containing sludge in oilfield in the sludge treatment field. The method comprises the following steps: 1, preparing a sludge sample; 2, preparing a solution to be measured; 3, drawing a standard curve: preparing multiple sodium humate standard solutions in volumetric flasks, adding a sodium hydroxide solution to scale lines, sequentially carrying out wavelength scanning on the solutions in the volumetric flasks by using an ultraviolet spectrophotometer in the order of the concentrations of the solutions in order to obtain maximum absorbance values corresponding to maximum absorption peaks, recording the maximum absorbance values, drawing the standard curve, and calculating a linear equation; and 4, measuring the concentration of the sample: diluting the solution to be measured, placing the diluted solution to be measured in the ultraviolet spectrophotometer, detecting the absorbance of the solution to be measured, and calculating the content of the humic acid by using the linear equation in step 3. The method adopting ultraviolet spectrophotometry has the advantages of short time, simplicity in operation, and high precision, and can be used in the measurement of the humic acid in the oil-containing sludge in the oilfield.
Description
technical field [0001] The invention relates to a method for measuring sludge components, in particular to a method for measuring humic acid content in oilfield sludge. Background technique [0002] Humic acid is the main component of humic substances. It is an organic acid, which includes black humic acid, brown humic acid and fulvic acid, and is generally used as an important indicator for evaluating soil fertility. Oilfield oily sludge is a kind of industrial solid waste, and the determination of humic acid content is of great significance to the resource utilization of oily sludge after harmless treatment. [0003] After retrieval, no patents or literature reports related to oilfield oily sludge humic acid determination methods have been found. The current national standard method: "Determination of Soil Humus Composition Sodium Pyrophosphate-Sodium Hydroxide Extraction Potassium Dichromate Oxidation Capacity Method" ( NY / T1867-2010), "Determination of Soil Organic Mat...
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IPC IPC(8): G01N21/33G01N1/28
Inventor 林刚郭鹏庄建全纪艳娟罗江涛王赪胤
Owner CHINA PETROLEUM & CHEM CORP
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