ISSN:
1436-5073
Schlagwort(e):
extended range Zeeman AAS
;
calibration by curve fitting
;
regression analysis
;
automatic evaluation
;
microcomputer-software package
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
Notizen:
Abstract The Perkin-Elmer Zeeman/5000 Atomic Absorption Spectrometer is only able to perform a calibration with three single standards or a one-point standard addition. The accuracy and precision of these methods are inappropriate in ETA-AAS, a computer-based data management is essential. A software package for calibration and evaluation was developed using curve fitting by linear regression based on a leastsquares fit when absorbances were transformed by the Baule-Mitscherlich function. The total analytical range could be covered by this method whether peak area or peak height values were fitted. The maximum absorbance levels could be calculated, as well. Absorbance signals were collected and stored by the “HGA-graphics” software (modified by Perkin-Elmer Nederland B. V.). The “Pecowriter” software was used for identifying data and file manipulations. The results of the calibration and evaluation can be stored on disk and/or printed. Calibration curves can be plotted on hardcopy output. The “Limit of Detection” and the “Characteristic Mass” can be calculated. The use of the CALIBRATION program is demonstrated by the calibration curves for the determination of Pb, Cd, As, Se, Cr, Al, Cu and Ni using mostly STPF-conditions. The performance of the method evaluated by the root mean square percent deviation of the fit is equal to the traditional curve-fitting function as well as to rational or quadratic functions. The use of the EVALUATION program is demonstrated by the results of the direct determination of lead in mineral waters.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF01207327
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