[Comparison of limited weight values and the sensitivity of analytical methods used for the detection of toxic atmospheric agents in working places].

This research has been carried out in order to estimate minimum sampling periods for the substances detailed in the VLP table given by the Italian Occupational Medicine Service and the Industrial Hygiene Group. These data take the following points into consideration: 1) sensitivity of the analytical method; 2) value and condition of sample at fulfilment of sampling periods; 3) sampling speed; 4) VLP, with special reference to ceiling value for very short exposure. As to dust the minimum period required is about 1 minute for numeric sampling, and 35 minutes for gravimetric sampling. 85% from the above-mentioned substances can be sampled at minimum periods which range from 1 to 5 minutes.