Applications of dispersion in unsegmented flowing streams to calibration in atomic absorption spectrometry

Atomic absorption spectrometers require calibration because no absolute mathematical relationship exists between the analytical signal and the analyte concentration. The calibration function is complex, depending upon instrument parameters, operating conditions and the chemical nature of the sample matrix. Recalibration is necessary whenever these change. Because existing methods of calibration are tedious and sometimes inaccurate, alternatives are sought. Rapid, automated calibration is particularly attractive. The prospects of achieving it using concentration gradients generated in flowing streams, with microcomputer data processing, were investigated. [Continues.]