Flame-atomic absorption analysis for trace metals after electrochemical preconcentration on a wire filament

✍ Scribed by Walter Lund; Yngvar Thomassen; Per Døvle

• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 589 KB
• Volume: 93
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(77)80006-8

✦ Synopsis

To avoid unspecific light losses in the atomic absorption analysis of trace metals in the presence of a high concentration of salts. electrochemical preeoncentration on a wire filament is employed, prior to flnme atomization. The elements in question are electrolyzed on to a platinum spiral filament which is then heated in an aincetylene flame.

A quartz tube is placed above the filament, to increase the sensitivity of the method.

Qe separation technique is simple and non-destructive; a sample volume of 5-20 ml and an electrolysis time of 2-5 min are recommended.

Because of the relatively low filament temperature, the method is limited to elements which are readily volatilized such as silver, bismuth, cadmium. mercury. lead. selenium, tellurium, thallium and zinc. For most elements, the detection limits are of the same order of magnitude as those of the "Delves cup" technique.