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Determination of sub-nanomolar concentrations of lead in sea water by adsorptive stripping voltammetry with xylenol orange

✍ Scribed by Qingguo Wu; Graeme E. Batley

Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 596 KB
Volume: 309
Category: Article
ISSN: 0003-2670
DOI: 10.1016/0003-2670(95)00055-5

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✦ Synopsis

Highly sensitive procedures are presented for the determination of sub-nanomolar concentrations of total dissolved lead and labile lead in sea water by adsorptive cathodic stripping voltammetry with ligand competition using xylenol orange (X0). Optimal analytical conditions were found to be an X0 concentration of 1 X 1O-5 M, a pH of 5, and an adsorption potential at -1.2 V vs. Ag/AgCl with stripping from -0.2 V. The limit of detection for a 180 s stirred adsorption time is 6 ng I-', making the method amenable to the determination of lead in open ocean waters.

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