In-stack filter

Source sampling of particulates requites isokinetic removal of a composite sample from the stack or vent effluent to determine representative emission rates. Samples are coUected either extractively or using an in-stack filter EPA Method 5 is representative of extractive sampling, EPA Method 17 of in-stack filtration. Other means of source sampling have been used, but they have been largely supplanted by EPA methods. Continuous in-stack monitors of opacity utilize attenuation of radiation across the effluent. Opacity measurements are affected by the particle size, shape, size distribution, refractive index, and the wavelength of the radiation (25,26). 

In-stack filters A filter positioned in the discharge stack to remove pollutants before the waste gases are discharged to outdoors. 

Air samples from stack emissions collected through an in-stack filter to remove particulates and ammonium salts, and then bubled through 0.1 N H2SO4... 

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See also in sourсe #XX -- [ ]

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