Monitoring Toxic Gases in the Atmosphere for Hygiene and by William Thain

By William Thain

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Extra info for Monitoring Toxic Gases in the Atmosphere for Hygiene and Pollution Control: Pergamon International Library of Science, Technology, Engineering and Social Studies

Sample text

1, 2, 3, 4 ) . Manufacturers list over 200 different tubes for the detection of gases in various concentrations and mixtures, and these are continually being added to as new requirements arise and tubes are developed to meet them. The operations involved in the use of indicator tubes are very simple. The sealed ends are broken off the glass tube to allow the sample gas to come in contact with the detecting reagent. One end of the tube is inserted into a holder in which it makes an air-tight seal.

The holder is attached to a pumping device and, on operation of this device, a specified volume of the sample is drawn through the indicator tube. The concentration of the substance to which the tube is sensitive is then determined by one of two procedures according to the construction of the indicator tube. In one system the entire length of the reagent changes colour by an amount which depends on the concentration of the substance to which it is sensitive. This concentration can then be determined by matching the colour which is generated with a set of standard colours which are provided with the indicator tube.

Changes due to filter blocking can most easily be observed by measurement of the pressure of the sample gas after it has passed through the filter. However, the presence of dust within the sampling system, whether on filters or deposited inside sampling lines, can affect the composition of the sample and so give rise to errors. For example, dust has a very large surface area and it can act as a base for reaction or adsorption of some of the components of the sample. This is most likely to occur with dusts which are chemically active or which are composed of particles of carbon, especially if they contain traces of oil.

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