BPChAr-a Benzene Polycarboxylic Acid database to describe the molecular characteristics of laboratory-produced charcoal: Implications for soil science and archaeology.

The Average CAS has a positive trend with increasing pyrolysis temperature ( Fig 4 ), with values increasing from approximately 4.3 ± 0.3 in chars produced at 200 °C ( n = 6) to 4.8 ± 0.2 at 400 °C ( n = 26), 5.2 ± 0.1 at 600 °C ( n = 20), and 5.8 ± 0.1 at 1000 °C ( n = 4).

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The remaining BPCA ratios in Fig 4 have a negative trend with increasing pyrolysis temperature.

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