Checklist for sample preparation

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
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