Slot burner diagram

Cutaway diagram to show the profile of a single-slot burner with raised edges. 

A schematic diagram of a typical LEI spectrometer is shown in Fig. 11. The bulk of LEI spectrometry and all of the detection limits reported in Fig. 2 have been accomplished using a premixed burner. In a premixed burner, the aspirated sample is mixed with the fuel and oxidant prior to combustion. A 10-cm slot burner head for acetylene-air has been used predominantly for LEI spectrometry 29 35) but results for a 5-cm... 

The burners used in flame spectroscopy are most often premixed, laminar flow burners. Figure 28-11 is a diagram of a typical commercial laminar-flow burner for atomic absorption spectroscopy that employs a concentric tube nebulizer. The aerosol flows into a spray chamber, where it encounters a series of baffles that remove all but the finest droplets. As a result, most of the sample collects in the bottom of the spray chamber, where it is drained to a waste container. Typical solution flow rates are 2 to 5 mL/min. The sample spray is also mixed with fuel and oxidant gas in the spray chamber. The aerosol, oxidant, and fuel are then burned in a slotted burner, which provides a flame that is usually 5 or 10 cm in length. 

Figure 11.11 Schematic diagram of the slot-burner used in flame atomic absorption spectroscopy.

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