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• Text ID: e.g., WDGE11258831 (Note: capital letter matters)
• Analysis: LOI
• Replicate: 1 (usually) leave blank, unless true replication (not just reanalyzing) of a sample, then begin replicate numbering with '0', then '1', then '2'.
• crucible_number: Crucible ID (e.g., A, B, F...)
• crucible_preignition_mass: crucible mass only (small inner crucible) (component unit: grams)
• crucible_and_preignition_sample_mass: inner crucible with fresh sample before ignition (component unit: grams)
• crucible_and_postignition_sample_mass: inner crucible with ignited sample after ignition (component unit: grams)
• loi_percent: LOI in % (component unit: none; the value is already a percentage)
• reference_mass: sample mass (calculated difference) (component unit: grams)
• comment: specify temperature and time used for LOI (e.g., 950 deg C for 4 hours; used during Exp 391)

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1. Wash the crucibles with DI water and a small piece of a scouring pad (no soap).
2. Rinse several times with DI water.
3. Place crucibles in a 10% HNO₃ bath for 12 hr. If in urgent need, the quartz crucibles can be soaked a minimum of 2 hours, but extra flux blanks will need to be made and added to batches that use these crucibles.
4. Rinse the quartz crucibles 3 times with DI water after the acid bath. For the ceramic crucibles, rinse 3 times with DI and then soak them in a large beaker of DI water for 4-6 hours to dilute the acid absorbed by the crucibles.
5. Dry the either type of crucibles in the oven at a maximum temperature of 60°C. For the ceramic crucibles, heat them to 800°C in the muffle furnace for 2 hours and allow to cool to room temperature before removing.

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