Journal: Chemie der Erde : Beitrage zur chemischen Mineralogie, Petrographie und Geologie

Article Title: Geochemistry and Cosmochemistry of Potassium Stable Isotopes

doi: 10.1016/j.chemer.2021.125786

Figure Lengend Snippet: Potassium isotope analysis method comparison

Article Snippet: Other standards , Bulk Silicate Earth (BSE) , in-house standard UW-K , NIST SRM 70b NIST SRM 918 NIST SRM 985 , NIST SRM 999c SRM 918b SRM 193 , Merck KGaA Suprapur , GBW(E) 081590 K solution , NIST SRM 3141a K standard solution , , .

Techniques:

Journal: ACS earth & space chemistry

Article Title: High-temperature inter-mineral potassium isotope fractionation: implications for K-Ca-Ar chronology

doi: 10.1021/acsearthspacechem.1c00147

Figure Lengend Snippet: Potassium Isotopic Compositions of Minerals and Bulk Rock Samples.

Article Snippet: Our laboratory in-house bracketing standard is the Suprapur® 99.995% purity potassium nitrate (KNO 3 ) purchased from Merck KGaA in 2014.

Techniques:

Journal: ACS earth & space chemistry

Article Title: High-temperature inter-mineral potassium isotope fractionation: implications for K-Ca-Ar chronology

doi: 10.1021/acsearthspacechem.1c00147

Figure Lengend Snippet: Potassium three-isotope plot for igneous rocks and minerals in this study. The δ41KSRM985 values are converted from the measured δ41K Suprapur values.4,29,34 δ40KSRM985 values are calculated by assuming mass-dependent fractionation law (δ40K SRM985 = 0.5131 × δ41K SRM985). The corresponding 40K/K values are also plotted as dashed lines. The 40K/K value (0.00011672) for NIST-SRM985 (δ40KSRM985 = 0) is from Garner et al.24 A refined 40K/K value (0.00011664) is proposed here as a better representative value for igneous rocks and minerals (except for some plagioclases).

Article Snippet: Our laboratory in-house bracketing standard is the Suprapur® 99.995% purity potassium nitrate (KNO 3 ) purchased from Merck KGaA in 2014.

Techniques: Fractionation