EXPRESS EVALUATION AND OPTIMIZATION OF DETECTION LIMITS IN ELECTROTHEMAL ATOMIC ABSORPTION SPECTROMETRY
The functional dependence of the photometric error from the photomultiplier voltage for atomic absorption spectrometer ZEEnit-650 produced by Analytik Jena, has been experimentally studied. This was used to develop, on the base of the algorithm, proposed by these authors previously, a fast semi-empirical method for estimating the detection limits in measuring the integrated absorbance. It was shown that this dependence, determined for one instrument, is acceptable to the whole series of ZEEnit instruments. The proposed approach is also applicable to other types of spectrometers. The functional dependence of the photometric error takes into account the design features of spectrometers. Some other parameters, as the baseline offset compensation time, integration time, light intensity, the background absorbance, and amplitude and integral values of the non-selective absorption, it is easy to evaluate by the use one-three determinations of the analytical signal. This is sufficient for the calculation and optimization of the detection limits of any analytes.