Determination method for dispersity of dust in air of working field

Abstract

The invention relates to a determination method for the dispersity of dust in air of a working field. The determination method comprises the following steps: preparation of a dust suspension solution according to GBZ/T192.3-2007 and ocular lens micrometer calibration; preparation of a dust sample, namely inflating the uniformly-mixed dust suspension solution into a counting tank of a blood counting plate; standing and depositing dust grains at the bottom of the counting tank; dispersity determination, namely taking off an objective lens micrometer and putting the blood counting plate into which the dust sample is dropped on an objective table; finding out the dust grains by using a low-power lens; observing with magnifying power by a calibration ocular lens micrometer; selecting four corners of a large square cell at the center of the counting tank and five middle square cells at the center of the counting tank; sequentially determining the size of each dust grain by using the objective lens micrometer; measuring a long diameter when meeting a long diameter amount and measuring a short diameter when meeting a short diameter amount; and recording by groups and calculating the percentage. According to the determination method, a blood counting plate method is used for determining the dispersity of the dust so as to effectively avoid the error caused by human factors of smearing and measuring links in a previous method, and guarantee the accuracy of a determination result.

Description

technical field [0001] The invention relates to a method for measuring the degree of dispersion of dust, in particular to a method for measuring the degree of dispersion of 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 degree of dust hazards depend on the characteristics of dust, and the degree of dust dispersion is one of the important characteristics of dust. [0003] Dust dispersion refers to the degree of distribution of dust particles of different sizes in the air, expressed in terms of quantity and mass percentage. Currently, th...

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Problems solved by technology

[0015] 2. It is difficult to unify the position of the smear where the microscope field of view is selected for measurement

[0017] 3. There is no reference object under the microscope, it is easy to miss and repeat the measurement

[0018] Because there are many dust particles in the field of view of the microscope, the size is different, and there is no reference object, it is easy to cause visual fatigue, so it is easy to miss and repeat the measurement

[0019] To sum up, this method has too many human influence factors, and the resulting error is difficult to control, resulting in different results even if the same sample is made by different people, and even the results made by the same person twice are very different.

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