Pumpless sampler for acquisition of benzene and methylbenzene in air

Abstract

A pumpless sampler mainly comprises a polytetrafluoro plastic housing, aluminium covers, a polytetrafluoro hydrophobic filter membrane, fibrous circular active carbon plates, polyurethane foam and a collar clamp. The specific composition is as follows: the two carbon plates are parallel to the cross section of a polytetrafluoroethylene plastic tubing and arranged at two ends and are isolated and fixed through the polyurethane foam between the carbon plates; and the two tubing ends are covered with the polytetrafluoro hydrophobic filter membrane, which is fixed and clamped with the aluminium cover. The sampler has the following advantages: the bidirectional transparent housing structure is beneficial to enhance the sampling efficiency and can achieve a satisfying effect in the aspects of adsorption flux and sample stability, and an adsorbent based on active carbon can effectively monitor most harmful gases in the environment. The sampler has very huge potential in the aspects of miniaturization and portability, has a wide application prospect in many fields such as occupational health, environment monitoring and the like, and especially is of great significance for personal sampling in the field of occupational health.

Description

technical field [0001] The invention relates to a pumpless sampler for collecting benzene and toluene in the air, in particular to a columnar pumpless sampler. Background technique [0002] At present, the field of occupational disease prevention and control in my country is facing a severe situation. The high incidence of occupational diseases and the serious harm affect the economic development and social stability. In order to effectively prevent the occurrence of occupational diseases and protect the health of workers who are the main body of occupational disease hazards, systematic detection and evaluation of occupational hazard factors is essential. In my country, in the field of occupational health, time-weighted average allowable concentrations, short-time exposure allowable concentrations, and maximum allowable concentrations are used to determine the impact of harmful factors in the workplace on the health of workers. The former requires a longer sampling time, and...

AI Technical Summary

Problems solved by technology

The direct sampling method has high requirements on the shape and preservation of the sample, so the scope of application is narrow; the pump sampling method is widely used, and the results are accurate. Satisfactory results can be obtained for short-term fixed-point sampling, but the air sampling pump needs to be carried when sampling. There are also certain requirements for the flow rate, electricity, and explosion-proof performance of the sampling pump; the non-pump sampling method is an emerging method in recent years. The design of the pump-free sampler is generally small and light, and it will not affect the work of workers when worn. , especially suitable for long-term individual sampling, and has unique advantages in calculating the time-weighted average allowable concentration

The popularity of pumpless samplers has significantly promoted the level of occupational health testing, but there are also many restrictive factors, especially the need for further research and demonstration on diffusion coefficient, sampling efficiency, etc., so as to obtain reliable results

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