Abstract
An automatic on-line flow injection dilution system for flame atomic absorption spectrometry was developed based on the injection of low- and submicroliter sample volumes and their dispersion in a mixing coil. Precise control of volumes was possible using computer-controlled stepper motor-driven peristaltic pumps and small-bore Neoprene pump tubes. A more than 1000-fold dilution with a precision of better than 2% (rsd) (n=15) was achieved using a sample volume of 0.7 μL and a mixing coil of 160-cm length and 1.3-mm i.d. Precision improved to 0.5-0.6% (rsd) when sampling times longer than 2 s were used. Sampling frequencies of 60-100/h, even for the highest dilutions, made the system highly compatible with routine application
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