Checklist for sample preparation
Checklist for Do’s
- Use a heating mantel or burner with glass beads to avoid bumping.
- Specific gravity – check the temperature during the analysis
- Weight/ml – avoid air bubbles in the tube.
- Polarimeter – Avoid air bubbles in the cell.
- For melting point, powder the substance to fine particles & fill in the capillary which is closed at one end, and make a compact bed by tapping in the capillary, to avoid air gaps in the capillary.
- For tap density: Use a dry cylinder.
- For LOD, sulphated ash, etc. keep cooling time constant.
- In the case of solid IR mix the substance with previously dried KBr & in proportion.
- In the case of liquid IR, avoid contact with an aqueous medium.
Checklist for Do’s and Don’ts
- Don’t heat the solution without a glass bead.
- Don’t use cold & hot material directly for analysis of specific gravity.
- Don’t take a reading if an air bubble is observed
- Don’t take a reading if an air bubble is observed
- Don’t use capillary if a gap is observed for melting points
- Don’t use a we cylinder for tap density analysis.
- Don’t keep the LOD bottle & Crucible for cooling more than 30 minutes.
- Don’t use KBR as such for the preparation of pellets
- Don’t use liquid cells having scratches for analysis