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Table 1 Peak assignments related to the chromatograms in Fig. 4 and the description of the compounds identified in the archaeological residue samples

From: Identification of the proto-inkstone by organic residue analysis: a case study from the Changle Cemetery in China

Sample Peak Retention time/min Composition Main m/z valuesa Compound
Sample I S1 20.67 C14H10 76, 89, 152, 178 Phenanthrene
  S2 28.45 C16H10 101, 202 Fluoranthene
  C16:0 28.58 C16H32O2 73, 117, 313b Palmitic acid
  S3 29.91 C16H10 101, 202 Pyrene
  C18:0 34.17 C18H36O2 73, 117, 341b Stearic acid
  S4 38.64 C18H12 114, 228 Benz[a]anthracene
  S5 47.55 C20H12 126, 252 Benzo[k]fluoranthene
  Sito 59.36 C29H50O 73, 129, 357, 396b β-Sitosterol
Sample II S1 20.67 C14H10 76, 89, 152, 178 Phenanthrene
  C14:0 22.81 C14H28O2 73, 117, 285b Tetradecanoic acid
  S2 28.48 C16H10 101, 122, 202 Fluoranthene
  C16:0 28.57 C16H32O2 73, 117, 313b Palmitic acid
  S3 29.90 C16H10 101, 174, 202 Pyrene
  Ret 32.93 C18H18 189, 204, 219, 234 Retene
  C18:0 34.17 C18H36O2 73, 117, 341b Stearic acid
  PMA 35.61 C20H30O2 73, 121, 257, 359b Pimaric acid
  DHA 37.88 C20H28O2 73, 239, 357, 372b Dehydroabietic acid
  S4 38.91 C18H12 114, 228 Benz[a]anthracene
  S4 39.17 C18H12 114, 228 Triphenylene
  S5 46.52 C20H12 126, 252 Benzo[a]pyrene
  S5 47.54 C20H12 126, 252 Benzo[k]fluoranthene
  S5 48.19 C20H12 126, 252 Benzo[k]fluoranthene
  S5 49.03 C20H12 126, 252 Benzo[b]fluoranthene
  S6 55.39 C22H12 138, 276 Indeno[1.2.3-cd]pyrene
  S6 56.45 C22H12 138, 276 Benzo[ghi]peryene
  Sito 59.38 C29H50O 73, 129, 357, 396b β-Sitosterol
  1. a Base peak is underscored
  2. b Analysed as trimethylsilyl derivative