The Use of Detectors and Test Kits in Industrial Hygiene Investigations

摘要

The streamlining of conventional air sampling equipment to facilitate sample collection and thereby aid industrial hygiene investigations has been accompanied by a noted increase in the output of detectors and test kits. Although detectors and test kits embrace a broad category of sampling devices, the basic instrument discussed here consists of two parts: (a) the sampler, or mechanical device for drawing the air to be tested through the detecting or collecting medium and (b) the detecting or collecting medium. The principal types of samplers are (1) electrical pumps, (2) metal hand pumps, (3) gas aspirating devices, (4) rubber bulbs or bellows and (5) glass syringes. All of these devices are usually calibrated in advance and are intended to be used in a manner that will cause a known volume of air to pass through the detecting medium. The most widely used types of detecting or collecting mediums consist of (1) prepared solutions (2) special papers or filters impregnated with selected reagents in advance or at the sampling site and (3) solid granules such as silica gel, diatomaceous earth or alumina impregnated with selected reagents.