A pyrometric feedback system covering the entire temperature program for electrothermal atomization-atomic absorption spectrometry
1984; Elsevier BV; Volume: 39; Issue: 2-3 Linguagem: Inglês
10.1016/0584-8547(84)80047-6
ISSN1873-3565
AutoresRobert Herber, H.J. Pieters, A.M. Roelofsen, W. van Deijck,
Tópico(s)Analytical Chemistry and Chromatography
ResumoA new pyrometric temperature feedback control system1 for ETA-AAS is introduced which controls the entire temperature range needed for analysis. The system consists of a single infrared sensitive detector and independent feedback control circuitry for the three separate heating stages of a Varian CRA 63 or CRA 90 power supply to which it was added. The temperature region covered by the system encompassed from 300 to 3300 K. The precision of the temperature control amounts to ±20 K at 330 K., ±5 K at 700 K and ±2 K at 2300 K. In order to test the performance of the system, lead in blood and cadmium in urine were determined. Substantial improvements as compared to the conventional system were obtained with respect to optimization of the temperature program, precision and sensitivity.
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