我们在实际测定工作中发现,除作业环境、排风、采样点的风向等影响测定结果外,还发现工人面罩内外的空气中二氧化锰浓度有显著差异。为了解进入工人体内的空气中二氧化锰浓度,自制了耳机式头戴空气采样器,同时测定工人鼻孔处面罩内外空气中二氧化锰浓度。焊工作业时多取蹲位,将自制耳机式采样器戴在头上,两个采样头正好位于工人鼻孔两侧,分别在面 We found in the actual measurement, in addition to the operating environment, exhaust, the wind direction of the sampling point and other effects of the measurement results, but also found that the workers inside and outside the mask of manganese dioxide concentrations were significantly different. To understand the concentration of manganese dioxide in the air entering the worker’s body, a head mounted air sampler was made and the concentration of manganese dioxide in the air inside and outside the mask at the nostril was measured. Welder job more take squatting, the homemade headphone-type sampler worn on the head, the two sampling head is located on both sides of the worker nostrils, respectively, in the face