New method for the spectrophotometric determination of ultramicro amounts of copper.
A deep yellow colour is formed by the reaction with phenol and chloramine-T in the presence of copper, and this reaction is used for the photometric determination of copper. An aqueous solution of copper and the reagents at pH 11.5-11.6 is heated. The molar absorptivity at 410 mmu, is 2.32 x 10(6). The method has been used satisfactorily to determine ultram amounts of copper in high-purity silicon.
Kakita
Y
Y
Research Institute for Iron, Steel and Other Metals, Tohoku University, Sendai, Japan.
Namiki
M
M
Gotô
H
H