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. Author manuscript; available in PMC: 2021 Jul 26.
Published in final edited form as: Geochim Cosmochim Acta. 2021 Mar 10;301:70–90. doi: 10.1016/j.gca.2021.03.004

Table 2.

Cr purification procedure used in this study.

Column 1: AG1-X8, 200–400 mesh anion resin, 1 mL
Step Reagent Volume (mL)
Condition Resin 3 M HNO3 10
Condition Resin MQ H2O 18
Condition Resin 6 M HCl 12
Condition Resin 6 M HCl 6
Load Sample 6 M HCl 1
Elute Cr 6 M HCl 4
Elute Fe 0.5 M HCl 8
Elute Zn 3 M HNO3 6
Column 2: AG50W-X8, 200–400 mesh cation resin, 1 mL
Step Reagent Volume (mL)
Condition Resin 6 M HCl 16
Condition Resin MQ H2O 32
Load Sample 1 M HCl 2.4
Elute Cr 1 M HCl 4.6
Strip Column 6 M HCl 8
Column 3: AG50W-X8, 200–400 mesh cation resin, 0.3 mL
Step Reagent Volume (mL)
Condition Resin 6 M HCl 9
Condition Resin MQ H2O 12
Load Sample 0.5 M HNO3 3
Elute Na, Ti, V 0.5 M HNO3 1
Elute Na, Ti, V 0.5 M HF 3
Elute Na, Ti, V 1 M HCl 5
Elute Cr 6 M HCl 5
Fe removal: AG1-X8 20–50 mesh anion resin, ~10 beads
Step Reagent Volume (mL)
Fe Removal 10 M HCl 0.100