A pretreatment method for oil in carbon residue for detection

Abstract

The invention belongs to the field of chemical detection, and specifically relates to a pretreatment method for oil in carbon residues for detection. After mixing the carbon residues and carbon tetrachloride, they are pressure-filtered from a solid-phase extraction column or a solid-phase extraction membrane. A carbon tetrachloride solution in which oil is dissolved is obtained. This pretreatment method overcomes the difficult problem of separation between small-density substances such as carbon residue and organic solvents such as carbon tetrachloride, ensures effective separation between carbon residue and the carbon tetrachloride solution that is dissolved with oil, and avoids carbon residue on the carbon tetrachloride solution. The influence of subsequent oil content determination; at the same time, the solid-phase extraction column and solid-phase extraction membrane itself will not affect the oil and carbon tetrachloride, and can enrich and purify the oil in carbon tetrachloride to improve the carbon residue The accuracy and reliability of the oil content test results.

Description

technical field [0001] The invention belongs to the field of chemical detection, and in particular relates to a pretreatment method for oil in carbon residues for detection. Background technique [0002] With the development of environmental protection, more and more enterprises pay attention to the utilization of waste. Some industrial waste and domestic waste are treated with multi-stage large-scale industrial equipment to obtain carbon residue. If the detected value of the carbon residue is within the emission standard limit If it is within the limit, it can be discharged or used for secondary utilization such as making handicrafts and returning to farmland. Oil, one of the components of carbon residue, is a difficult pollutant to clean up. [0003] In order to conveniently and accurately detect the oil in the carbon residue, refer to the determination method in HJ 637-2012 "Determination of Water Quality Petroleum and Animal Oil", and choose carbon tetrachloride as the ...

AI Technical Summary

Problems solved by technology

[0003] In order to conveniently and accurately detect the oil in the carbon residue, refer to the determination method in HJ 637-2012 "Determination of Water Quality Petroleum and Animal Oil", and choose carbon tetrachloride as the extraction reagent. However, the carbon residue has a small density and is very easy to float or Suspended in carbon tetrachloride, and it is difficult to separate from carbon tetrachloride, which affects the accuracy of oil content detection

In order to remove carbon residue, filter paper or absorbent cotton is currently used for filtration, but the filtration speed of filter paper or absorbent cotton is slow, which may also affect the accurate detection of oil content

On the one hand, the filtration speed of filter paper or absorbent cotton is slow, which may cause the volatilization of oil and carbon tetrachloride, and prolong the contact time between filter paper or absorbent cotton and oil and carbon tetrachloride, affecting the accurate detection of oil content; On the one hand, the filter paper is easily damaged, and the absorbent cotton will also leak, which is difficult to meet the separation and purification requirements, or repeated operations to meet the separation and purification requirements also affect the accurate detection of oil content

[0004] Therefore, in order to overcome the problem that the oil content in the carbon residue cannot be measured accurately due to the difficulty of separating the small density substances such as carbon residue and organic extractants such as carbon tetrachloride, it is very important to provide a new pretreatment method for the oil content in the carbon residue. It is necessary that the method does not affect oil and organic solvent (carbon tetrachloride) (such as adsorption, chemical reaction), and can quickly separate carbon residue from oil and organic solvent (carbon tetrachloride) Improve the accuracy and reliability of oil content determination in carbon residue