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Table 4 Estimation of the collection efficiency of the extraction thimble for calcium carbonate and Gofun (oyster shell) powder

From: Biobased carbon content of resin extracted from polyethylene composite by carbon-14 concentration measurements using accelerator mass spectrometry

Entry

Sample (w/w)

Content of calcium carbonate (wt%)a

1

bHDPE/CaCO3 (75/25)

0.014

2

bHDPE/Gofun (75/25)

0.390b

3

CaCO3

0.012c

4

Gofun

0.024b, c

  1. aMeasurements of calcium carbonate in recovered precipitates and extraction solutions carried out using ICP.
  2. bContent of Gofun powder in the precipitates was calculated on the assumption that Gofun was a pure calcium carbonate.
  3. cContent of calcium carbonate in the extraction solvents was calculated based on sample weight.