Method for determining oil mist in workshop air by non-dispersive infrared process

Abstract

The invention provides a method for determining oil mist in workshop air by a non-dispersive infrared process, which comprises the following steps: collecting oil mist in workshop air, transferring the collected sample into a color comparison tube, adding a solvent incapable of absorbing infrared radiation to carry out extraction, determining the extracting solution by a non-dispersive infrared process, recording the absorbance at the wavelength of 3.400 mu m in the infrared spectrum, and acquiring the content of oil mist according to an external standard method. The method provided by the invention has the advantages of high accuracy, high speed, small interference and high sensitivity, and the precision and accuracy are respectively less than 5%, thereby satisfying the demands of people for detection work and research. The invention fills up the blank of the method for determining oil mist in workshop air by a non-dispersive infrared process.

Description

technical field

[0001] The invention relates to a non-dispersive infrared method for measuring oil mist in workshop air, in particular to a non-dispersive infrared method for measuring oil mist in workshop air. Background technique

[0002] Lubricating oil is an important raw material used in industries such as mechanical processing, heat treatment and transportation. Its main components are hydrocarbons, and usually contain a small amount of polycyclic aromatic hydrocarbons and heterocyclic compounds. It exists in the state of oil mist in the air of the workshop . With the development of industrial modernization, the environment of oil mist in the air of workshops is increasing, and the health hazards of oil mist to employees have become increasingly prominent. However, my country has not yet established a standard detection method for oil mist in workshop air. Therefore, it is imminent to study the detection method of oil mist in workshop air.

[0003] At present, the de...

Examples

Embodiment 1

[0018] Example 1, Determination of oil mist in the air of a machining workshop of a mold factory

[0019] Step 1: Collect the oil mist in the 60L workshop air with a glass fiber filter membrane, the first filter membrane is 3 μm, and the second filter membrane has a pore size of 0.4 μm;

[0020] Step 2: Transfer the collected sample into a colorimetric tube, add 10ml of tetrachlorethylene that has passed through a magnesium silicate chromatography column, and extract for 5 minutes;

[0021] Step 3: After extraction, the solution is measured by non-dispersive infrared method, and the absorbance at 3.4 μm wavelength is A 3.4 is the ordinate y, and the concentration of the oil mist is the abscissa x, the measured standard curve equation is y = 0.0162x + 0.0053, and the correlation coefficient R 2 =0.9998, according to spectrum A 3.4 =0.2520, the concentration of oil mist in the solvent is 15.23mg / L, that is, the concentration of oil mist in the workshop air is 2.54mg / m 3 .

...

Embodiment 2

[0025] Example 2, Determination of oil mist in the air of a cold rolling workshop of a stainless steel enterprise

[0026] Step 1: Collect the oil mist in the 60L workshop air with a mixed fiber filter membrane, the first filter membrane is 5 μm, and the second filter membrane has a pore size of 0.4 μm;

[0027] Step 2: Transfer the collected sample into a colorimetric tube, add 10ml of tetrachlorethylene that has passed through a magnesium silicate chromatography column, and extract for 5 minutes;

[0028] Step 3: After extraction, the solution is measured by non-dispersive infrared method, and the absorbance at 3.4 μm wavelength is A 3.4 is the ordinate y, and the concentration of oil mist c is the abscissa x, the measured standard curve equation is y = 0.0074x-0.001, and the correlation coefficient R 2 =0.9998, according to spectrum A 3.4 =0.0914, the concentration of oil mist in the solvent is 12.48mg / L, that is, the concentration of oil mist in the workshop air is 2.08...

technical field

[0001] The invention relates to a non-dispersive infrared method for measuring oil mist in workshop air, in particular to a non-dispersive infrared method for measuring oil mist in workshop air. Background technique

[0002] Lubricating oil is an important raw material used in industries such as mechanical processing, heat treatment and transportation. Its main components are hydrocarbons, and usually contain a small amount of polycyclic aromatic hydrocarbons and heterocyclic compounds. It exists in the state of oil mist in the air of the workshop . With the development of industrial modernization, the environment of oil mist in the air of workshops is increasing, and the health hazards of oil mist to employees have become increasingly prominent. However, my country has not yet established a standard detection method for oil mist in workshop air. Therefore, it is imminent to study the detection method of oil mist in workshop air.

[0003] At present, the de...

Examples

Embodiment 1

[0018] Example 1, Determination of oil mist in the air of a machining workshop of a mold factory

[0019] Step 1: Collect the oil mist in the 60L workshop air with a glass fiber filter membrane, the first filter membrane is 3 μm, and the second filter membrane has a pore size of 0.4 μm;

[0020] Step 2: Transfer the collected sample into a colorimetric tube, add 10ml of tetrachlorethylene that has passed through a magnesium silicate chromatography column, and extract for 5 minutes;

[0021] Step 3: After extraction, the solution is measured by non-dispersive infrared method, and the absorbance at 3.4 μm wavelength is A 3.4 is the ordinate y, and the concentration of the oil mist is the abscissa x, the measured standard curve equation is y = 0.0162x + 0.0053, and the correlation coefficient R 2 =0.9998, according to spectrum A 3.4 =0.2520, the concentration of oil mist in the solvent is 15.23mg / L, that is, the concentration of oil mist in the workshop air is 2.54mg / m 3 .

...

Embodiment 2

[0025] Example 2, Determination of oil mist in the air of a cold rolling workshop of a stainless steel enterprise

[0026] Step 1: Collect the oil mist in the 60L workshop air with a mixed fiber filter membrane, the first filter membrane is 5 μm, and the second filter membrane has a pore size of 0.4 μm;

[0027] Step 2: Transfer the collected sample into a colorimetric tube, add 10ml of tetrachlorethylene that has passed through a magnesium silicate chromatography column, and extract for 5 minutes;

[0028] Step 3: After extraction, the solution is measured by non-dispersive infrared method, and the absorbance at 3.4 μm wavelength is A 3.4 is the ordinate y, and the concentration of oil mist c is the abscissa x, the measured standard curve equation is y = 0.0074x-0.001, and the correlation coefficient R 2 =0.9998, according to spectrum A 3.4 =0.0914, the concentration of oil mist in the solvent is 12.48mg / L, that is, the concentration of oil mist in the workshop air is 2.08...