Background corrector system

Practical system for flame atomic absorption spectrometry including a deuterium background corrector. 

Operating conditions. AAS device with background corrector, absorption cuvette open (15 cm length, 15 mm diameter) and closed system with crystal windows circulating pump, 2.51 min-1 pressure fusion vessel. Wavelength, 253.7 nm EDL, Hg (5 W) deuterium compensator. 

Sodium (Na), potassium (K), magnesium (Mg), and calcium (Ca), concentrations were measured by atomic absorption spectrophotometry (Perkin Elmer 2380 equipped with deuterium background corrector). Cd, Zr, and Cu concentrations were obtained in a quartz cell, by differential pulse anodic stripping voltammetry (DPASV) with a assy carbon thin-film mercury covered electrode (Tacussel polarographic equipment fitted with a Tacussel EDI type electrode). Pure water was produced by a Milli. Q water purification system (Millipore). Chlorate, sulfate and carbonate were measured using classical methods. 

Figure 6.26 Continuum background corrector in a double-beam AAS system. [From Beaty and Kerber, used with permission of PerkinElmer, Inc. (www.perkinelmer.com).]...

Perkin-Elmer M 2100 atomic absorption spectrometer with deuterium lamp background corrector. Cadmium and lead hollow cathode lamps operated at 4 mA and 7 mA, and 228.8 nm and 283.3 nm wavelength respectively. Spray chamber used without impact system. Acetylene flow-rate 1.0 1 min , air flow-rate 10 1 min (extra-lean flame). Peak height evaluation with a time constant of 0.5 s. FI peaks recorded by a printer or chrrt recorder. 

Perkin-Elmer M 2100 atomic absorption spectrometer with deuterium lamp background corrector and FlAS-200 flow injection system. Cadmium hollow cathode lamp operated at 5 mA and 228.8 nm wavelength. Flame conditions as recommended by manufacturer. 

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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