LIB filter apparatus

LIB filter apparatus (VDI 3875, Part 1,1996) This device includes the sampling unit, a rotary pump with an output of about 16m%, a gas meter with thermometer, timer, sample air cooler and silencer. 

PCDDs/PCDFs LIB filter apparatus Small filter apparatus glass fiber filter/PUF GC/MS A... 

For the measurement of PCBs in indoor air, the VDI guideline 2464, Part 1 (1992) is currently in preparation. Sampling can be performed on a glass fiber filter and on PUF plugs by use of the LIB filtering apparatus or a small filter apparatus. Before sampling... 

Glass fiber filter (VDI 3498, Part 1,1998) External diameter 120 mm (LIB apparatus) or 50 mm (small filter apparatus) with a collection efficiency of 99.8 % for particles with an aerodynamic diameter >0.3 //m. The filter must be baked-out at 250-400 °C before use. 

When the reaction is finished, heating of Ila and lib is stopped. Flask IV is removed and stoppered. In its place is attached an empty flask N2 is passed continuously through the apparatus for another 2-3 hours. The contents of flask IV, usually contaminated with some black and red solids, are filtered through neutral alumina. This is done in a well-ventilated hood or, even better, in a glove bag setup in a well-ventilated hood. 

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