The determination of aluminium in seawater and freshwater by cathodic stripping voltammetry

✍ Scribed by Constant M.G. van den Berg; Kevin Murphy; John P. Riley

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 612 KB
• Volume: 188
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/s0003-2670(00)86041-9

✦ Synopsis

Dissolved aluminium in seawater and freshwater is determined by cathodic stripping voltammetry (c.s.v.) preceded by adsorptive collection of complex ions with 1,2dihydroxyanthraquinone-3-sulphonic acid (DASA) on the hanging mercury drop electrode. Complexation of aluminium by DASA is rapid and no waiting period or heating of the sample is required. Optimal conditions are a DASA concentration of lo-' M, a solution pH of 7.1-7.3 and an adsorption potential of -0.9 V, the c.s.v scan is done in the differential-pulse mode. The limit of detection is 1 nM alumimum for an adsorption time of 45 s. The total time needed, includmg 5-min deaeration and a standard addition, is 10-15 min per sample. No serious interferences were found; U.V. irradiation IS recommended for samples containing high levels of organic materials.