1.3.1. Freezing with dry ice

  • Samples: all.
  • Conditions: freeze instantly; keep frozen throughout transport using blocks of dry ice in a cooler.
  • Transport: restricted transport; dry ice must be replenished ca. every 48 hours.
  • Processing: transfer samples to freezer.
  • Pros: gold standard; fast.
  • Cons: very expensive; complex field operation.