Abstract
This paper presents the application of the tubular detector based on silver solid amalgam (TD-AgSA) for electrochemical determinations of reducible inorganic (Cd2+, Zn2+) and organic (4-nitrophenol) compounds under flow injection analysis conditions. The newly developed TD-AgSA is simple, robust and inexpensive.
The limits of detections of Zn2+, Cd2+ and 4-nitrophenol are 1.4x10-6, 7.0x10-7, and 5.0x10-7 mol.dm-3, respectively (i.e. 0.09, 0.08 and 0.07 ppm). The obtained results proved the long-term stability of the detector (RSD of the determination of Zn2+, Cd2+, and 4-nitrophenol were 0.8, 0.9 and 0.8% (n=10; cZn=7.7x10-5 mol.dm-3, cCd=4.5x10-5 mol.dm-3 and c4-NPh=3.6x10-5 mol.dm-3), respectively and its applicability for cathodic measurements in aqueous solutions at potentials up to -2 V.