Copper Isotope Materials
Natural samples cover a range of roughly 16 ‰ for δ65Cu with the most positive values found in carbonates and the most negative values in copper chlorides. Most studies of copper isotopic-abundances focus on geochemical topics or, in special cases, on financially driven topics, such as the provenance of minerals.
|NIST SRM 976||elemental Cu||0 ‰*|
|ERM-AE633||Cu(NO3)2 solution||-0.01(6) ‰|
|ERM-AE647||Cu(NO3)2 solution||-0.21(6) ‰|
* Exact value defining the δ65CuSRM976 scale.
Values in parenthesis are expanded (k = 2) uncertainties applicable to the last digits. The values listed in this table are compilation and are not necessarily CIAAW recommendations.