Mercury Isotope Materials
Natural isotopic variations of mercury isotopes encompass a δ202/198Hg range of about ±4 ‰. Triggered by the rapid development in multi-collector ICP-MS, mercury-isotope studies have increased significantly within the last decade. Mercury-isotope research is carried out in many disciplines, and a major part involves investigating isotopic fractionation in the biogeochemical mercury cycle. Within this research, mass-independent isotopic fractionation of mercury has been observed. Differentiation between mass-dependent and mass-independent isotopic fractionation of mercury isotopes requires higher precision than usual, therefore, mercury isotopic reference materials supporting measurement uncertainties in the sub-permil range are required.
|NRC NIMS-1||solution||0 ‰ *|
|NIST SRM 3133||solution||0 ‰ **|
|NIST SRM 2225||elemental Hg||+4.6(1.3) ‰|
|NIST SRM 1641d||solution||+0.03(10) ‰|
* Exact value defining the δ202/198HgNIMS1 scale.
** See the Assessment of international reference materials for isotope-ratio analysis for more details.
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.