Abstract
A flow-injection system for multielemental analysis with a mercury(II) preconcentration step using a resin Chelite-S® (Serva Feinbiochemica Heidelberg, Part No. 41709) packed minicolumn by inductively coupled plasma atomic emission spectroscopy is described. A mercury reductive elution procedure with a mixture of SnCl2/HCl was used, which allows use of 6 mol/L HCl solution instead of concentrated hydrochoric acid. The main parameters related to ICP operation, such as radio frequency power (950–1750 W), auxiliary argon flow (0.0–1.5 L/min) and spray chamber nebulizer pressure (15–35 psi), were studied. Optimization of the FIA system was reached by defining the best eluent carrier stream (1.4–2.8 mL/min), Hg° carrier stream (10–40 mL min−1), loading time (0.5–4.0 min), sample flow rate (1.25–10.0 mL/min), temperature of reactor gas–liquid separator (GLS) (25–75°C) and eluent volume (50–350 µL). Throughput is around 30 samples per hour for analytical solutions within the range 50–2500 ng Hg(II)/L. Results from certified material showed good precision (RSD <3%, n = 12) and no statistical difference was observed for real samples analyzed by AAS and by the proposed system.
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