A spectrophotometric method for the determination of copper ions and its application to the co-precipitation of copper in the crystallization of sodium.
The molar absorptivity of the cyanide complexes [Cu(CN)(3)](2-) and [Cu(CN)(4)](3-), at their isosbestic wavelength (235 nm) is 1.13 x 10(3) l.mole(-1)mm.(-1) and can be used for the quantitative determination of micro-amounts of copper in the ppm range. The determination of 1-10 mug of Cu(2+) per g of NaCl, or 0.25-2.5 mug ml , is described in detail. The co-precipitation of copper with NaCl crystallizing from aqueous solutions has been studied by this method.
Glasner
A
A
Department of Inorganic and Analytical Chemistry, The Hebrew University of Jerusalem, Jerusalem, Israel.
Sarig
S
S
Weiss
D
D
Zidon
M
M