Method for measuring total dust number concentration in air of workplace

Abstract

The invention relates to a method for measuring total dust number concentration in air of a workplace. The method comprises steps as follows: collection of a dust sample: the dust sample is collected according to GBZ159-2004; preparation of a suspension liquid: a vinylidene chloride filter membrane which collects dust is placed in a small beaker, 4 ml of butyl acetate is accurately added, the mixture is uniformly mixed, and the dust suspension liquid is prepared; preparation of a dust sample: a clean blood cell counting board and cover glass are well placed, the dust suspension liquid sufficiently and uniformly mixed is sucked by a disposable dropper and added into a counting chamber for standing for 2-3 minutes, and dust particles naturally settle at the bottom of the counting chamber; and measurement of number concentration: the blood cell counting board where the dust sample is dropped is placed on an objective table of a microscope, all dust particles in four corners of a large grid at the center and five middle grids in the middle are counted by a high-power lens, and the total dust number concentration is calculated. The total dust number concentration is measured with a blood cell counting board method, and the method is scientific, advanced, simple and convenient to operate, controllable in error and capable of guaranteeing the accuracy of results.

Description

technical field [0001] The invention relates to a method for measuring the number concentration of total dust, in particular to a method for measuring the number concentration of total dust in the air of a workplace. Background technique [0002] Dust refers to solid particles with a small diameter, which can float in the air for a long time. It is the most common occupational hazard in the workplace. When the dust reaches a certain concentration, there is still a hidden danger of dust explosion, which seriously endangers the health of workers, destroys productivity resources, and brings huge economic losses to the country and people's lives and property. The nature and extent of the dust hazard depends on the concentration and characteristics of the dust. [0003] Dust concentration refers to the quality or quantity of dust contained in a unit volume of air. The higher the dust concentration, the more serious the harm to the human body. It can be seen that the dust concen...

AI Technical Summary

Problems solved by technology

It can be seen that only using the mass concentration to evaluate the dust operation environment and dust prevention measures is not enough to fully and truly reflect the actual situation, so it is very necessary to introduce the number concentration of dust, but there is no measurement method for the number concentration in my country's health standards. Practical work brings a lot of inconvenience

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