| Colorimetric Determination of Monovalent Copper
1n Copper Ruby Glass by Complexing
with 2, 2 -Biquinoline |
S. SEN SARMA
Pages : 205-208
DOI : 10.1080/0371750X.1981.10822550 |
| Abstract |
| 2, 2-biquinoline forms a very sensitive coloured cationic complex
with monovalent copper and is used for determination of trace
amount of copper. So far, no use have been made of this reagent for
direct estimation of monovalent copper in cuprous compounds or
materials containing monovalent copper due to instability in acid
solution. In the present investigation, attempts have been made to
utilize this reagent in the direct estimation of monovalent copper in
copper-ruby silicate glass. The existing method has been modified to
carry out the estimation in 50% aqueous isopropyl alcohol to shorten
the time to arrest the oxidation of monovalent copper to bivalent
state. Glass samples were dissolved in hydrochloric and hydrofluoric
acid in presence of the reagent and the optical density of colour
developed at a pH about 5 was measured at a wavelength of 545 nm.
Experiments were carried out to determine the monovalent copper in
actual copper glasses melted with and without tin. The results showed
that major part of the copper in copper-ruby silicate glasses is present
in cuprous state. |
| Full text : Subscribe to Download Full Text |
| [Go Back] |
|
