Furnace controlled programmes Atomization

Modern graphite furnace atomizers have a separate power supply and programmer that control the electrical power, the temperature program, the gas flow, and some spectrometer functions. For example, the spectrometer can be programmed to read , that is, collect absorbance data, only when the furnace reaches the atomization temperature. This saves data storage space and data processing time. 

As stated above, the sample dispensed into the furnace is subjected to a multi-step temperature programme. When the temperature is increased to the point where sample atomization or vaporization occurs, measurements are made directly or after transporting the vapour to the ICP torch or MS instrument. The variables under operator control in this situation are as follows ... 

Two principal advantages of the probe atomization are (i) Improved control of the vapour temperature the atoms experience (ii) Rapid heating of the atomization surface to the volatilization temperature of the analyte and matrix. A comparison of typical furnace programmes for wall/platform atomization and probe atomization is given in Table 8. The probe is not in... 

The FID collector assembly was modified to connect, via Swage-lok fittings, to a small bore (0.027-inch i.d.), heated, programmable, stainless steel transfer tube, manufacured by Chemical Data Systems, Inc., Oxford, Pa. 19363. The GC injection ports, FID detector, and transfer tube were maintained at lOO C for all experiments conducted. The total column effluent from the GC was conducted through the transfer tube to the detector, a Perkin-Elmer model 360 atomic absorption spectrophotometer fitted with a deuterium background corrector and a HGA-2100 graphite furnace atomizer employing a temperature dial control power supply. 

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