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%LOI = 100 x (weight change during ignition)/ (fresh sample weight).
Note: By convention, weight lost during ignition is recorded as a positive LOI value; whereas weight gained is recorded as a negative LOI value. Report the results to 2 decimal places.
Uploading LOI Data To LIMS
Open the Excel File 'LOI Spreadsheet Upload Template' in Local Disk > DATA (Figure 46). Put your LOI information into the spreadsheet following the example format. Fill in the Text ID, Analysis, Replicate, Crucible number, and all weights and units including the %LOI.
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Copy and paste your spreadsheet into that uploader. Click the 'Edit' button and 'Validate Sheet'. This checks and highlights any errors that need to be fixed. When the spreadsheet comes up clean, click 'Lims' and 'Upload'. The sheet will turn green when the measurements are successfully uploaded. The data is now in LIMS under Chemistry > ICP-AES Solids >Expanded LOI.
Cleaning the Quartz Crucibles
- Wash the crucibles with DI water and a small piece of a scouring pad (no soap).
- Rinse several times with DI water.
- Place crucibles in a 10% HNO3 bath for 12 hr.
- Rinse 3 times with DI water after the acid bath.
- Dry the crucibles in the oven at a maximum temperature of 60°C.
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