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Method for determination of concentration of mineral oil mist in workshop air

A workshop air and measurement method technology, applied in the direction of measuring device, color/spectral characteristic measurement, material analysis through optical means, etc., can solve the problems of weighing error, tediousness, incomplete gasification, etc., and achieve easy operation and high sensitivity High and low cost effect

Inactive Publication Date: 2013-01-02
浙江中一检测研究院股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ultraviolet spectrophotometry has the advantages of simple operation, rapidity, and low cost. However, because actual samples generally have color, when using ultraviolet spectrophotometry to measure, the chromaticity of the sample will interfere with the determination of absorbance; polarized light method requires weighing method To calibrate the detection system, this method has high accuracy, but it is cumbersome, time-consuming, and requires strict operating conditions, so it is not easy to master; the weighing method may cause the fibers of the filter membrane or filter cartridge to fall off during the sampling and testing operation, which may cause weighing Error; the mineral oil mist in the workshop air may contain components with high boiling points, so the use of gas chromatography will lead to incomplete gasification of the inlet, there will be residues, and the detection limit is relatively high

Method used

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  • Method for determination of concentration of mineral oil mist in workshop air
  • Method for determination of concentration of mineral oil mist in workshop air
  • Method for determination of concentration of mineral oil mist in workshop air

Examples

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Effect test

Embodiment 1

[0035] Example 1, Determination of Mineral Oil Mist Concentration in the Air of a Grinding Workshop of a Metal Processing Enterprise in a City

[0036] (1) The collection, transportation and storage of samples: ①Ultrafine glass fiber filter membranes are all cleaned with CCl before sampling 4 Soak for 24 hours, take it out, dry it at 60°C, and calcinate it in a muffle furnace at 200°C for 2 hours; 3. After sampling, take off the ultra-fine glass fiber filter and fold it in half, put it in a plastic bag and bring it back to the laboratory for testing, and record the temperature, air pressure and humidity at the sampling point at the same time; 4. Simultaneously collect blank control Sample, that is, the sample with the ultrafine glass fiber filter membrane installed is entrained to the sampling point, except that the air sample is not collected, the rest of the operation is the same as the sample;

[0037] (2) The analysis part of the sample: put the sampled filter membrane in...

Embodiment 2

[0059] Embodiment 2, determination of mineral oil mist concentration in the air of a certain stainless steel enterprise

[0060] (1) The collection, transportation and storage of samples: ①Ultrafine glass fiber filter membranes are all cleaned with CCl before sampling 4 Soak for 24 hours, take it out, dry it at 60°C, and calcinate in a muffle furnace at 200°C for 2 hours; 3. After sampling, take off the ultra-fine glass fiber filter membrane and fold it in half, put it in a plastic bag and bring it back to the laboratory for testing, and record the temperature, air pressure and humidity at the sampling point at the same time; 4. Simultaneously collect blank control Sample, that is, the sample with the ultrafine glass fiber filter membrane installed is entrained to the sampling point, except that the air sample is not collected, the rest of the operation is the same as the sample;

[0061] (2) The analysis part of the sample: put the sampled filter membrane into a 10mL stoppe...

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Abstract

The invention provides a method for determination of a concentration of mineral oil mist in workshop air. The method comprises the following steps of collecting an oil mist sample form air by an ultrafine glass fiber membrane, carrying out extraction by 10mL of CCl4, directly carrying out detection by an infrared spectrophotometer by scanning in a range of 2700 to 3200cm<-1> to obtain the maximum absorption peak as a sample measurement wave number, and subtracting the absorbance at the wavelength of 3200cm<-1> from the absorbance of the maximum absorption peak to quantify a concentration of mineral oil mist in the oil mist sample. The method is accurate and fast, produces a small interference, has high sensitivity, precision less than 10%, accuracy less than 10% and a detection limit of 2.0 microgrammes per milliliter, and satisfies detection and research requirements. The method provided by the invention fills in the blank of infrared spectrophotometry-based determination of mineral oil mist in workshop air.

Description

technical field [0001] The invention relates to a method for measuring the concentration of mineral oil mist in workshop air, in particular to a method for measuring the concentration of mineral oil mist in workshop air by infrared spectrophotometry. Background technique [0002] Mineral oil is an important raw material widely used in industries such as mechanical processing, heat treatment and transportation. Its main component is hydrocarbon, and usually contains a small amount of polycyclic aromatic hydrocarbons and heterocyclic compounds. It exists in the state of oil mist in the workshop air. Studies have shown that oil mist can enter the alveoli through breathing, causing coughing, swelling of lung tissue, headache, nausea, coma, and even death; in addition, oil mist can irritate exposed skin and cause redness and swelling. Early scholars pointed out that metal processing lubricants and their oil mist have a tendency to cause cancer, among which skin cancer, respirator...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/35G01N21/3577
Inventor 姚科伟何莲屠伟斌贺玲敏王雪刘丽
Owner 浙江中一检测研究院股份有限公司
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