The heterometric micro-determination of copper with quinaldic acid in the presence of foreign metals

✍ Scribed by M. Bobtelsky; B. Graus

• Publisher: Elsevier Science
• Year: 1954
• Tongue: English
• Weight: 447 KB
• Volume: 11
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/s0003-2670(00)87728-4

✦ Synopsis

The determination of copper with quinaldic acid has been investigated by various workers'. Most of the studies concern the gravimetric determination of copper in the presence of zinc, cadmium or iron. Because the metal quinaldate precipitates very slowly at room temperature, the gravimetric determination is carried out at a higher temperature. The determination of copper has also been studied by the amperometric method. This paper deals with the heteromctric determination of copper quinaldate at room temperature. Approximately z mg of copper in a volume of IO the use of an aqueous solution ; the initial precipitation occurs instantiy, either in the absence or in the presence of foreign metals or complexing agents; the determination is possible in almost all cases; bivalent or trivalent metals may be present in large excesses; the presence of iron dots not interfere if a complexing agent is used (in contrast to oxine). The maximum density values increase in special cases (iron or magnesium), making the determination more sensitive. Only in the presence of large excesses of zinc is the determination limited. EXPERIMENTAL The same apparatus and technique were used as in previous investigations2. The chemicals used were all either analytical reagents or chemically pure. The References p. 259.