Amperometric determination of cyanides by automated preconcentration based on gas diffusion coupled to sequential injection analysis
Αμπερομετρικός προσδιορισμός κυανιούχων ιόντων σε δείγματα πόσιμου νερού με την τεχνική των διαδοχικών εγχύσεων (sequential injection) μετά από προσυγκέντρωση του δείγματος σε κυψελίδα διάχυσης αερίων
Ζάχαρης, Κωνσταντίνος Κλέαρχου
Στην παρούσα εργασία έχει αναπτυχθεί μια απλή και ευαίσθητη μέθοδος για τον προσδιορισμό των κυανούχων ιόντων με την τεχνική των διαδοχικών εγκύσεων.
A simple, sensitive method for determining weak acid dissociable (WAD) cyanides is described. The assay is based on automated gas diffusion of the analyte using sequential
injection analysis coupled to amperometric detection on a silver electrode. The effects of
varying several parameters affecting the analytical procedure (including the flow rates of
the donor and acceptor streams, the concentrations of the reagents and the sample
volumes) were studied. The validity and quality of the method were also assessed, by
examining its linearity, limits of detection and quantitation, precision, selectivity to
potentially interfering substances. Its sensitivity can be enhanced by applying a simple
preconcentration step, the limits of detection were found to be 0.05 – 0.12 μg L-1.
Application of the proposed assay to the analysis of tap, mineral and table water samples
spiked at concentrations ranging from 1 to 10 μg L-1 CN-, yielded satisfactory recoveries
(88 – 112 %).
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