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Table 2 Evaluation indices of n-alkanes for water from Lake Taihu

From: Characteristics of petroleum contaminants and their distribution in Lake Taihu, China

Sampling points Main peak carbon Carbon number distribution CPI OEP Pr/Ph Pr/C17 Ph/C18
S8 16 11-28 0.96 0.71 0.54 0.73 1.27
S10 20 8-33 1.11 1.03 0.60 0.54 0.59
S11 15,25 8-30 1.14 1.09 0.87 0.59 0.88
S24 18 8-29 0.68 0.85 1.29 0.47 0.35
S16 16 8-31 1.00 0.90 1.00 0.53 0.60
S16-1 15 8-29 1.27 1.43 0.91 0.59 0.69
S16-2 16 8-31 1.41 0.51 1.00 0.43 0.75
  1. Note:
  2. CPI: Carbon predominance index; OEP: Odd-even predominance; Pr: Phytane; Ph: Pristane.
  3. The evaluation indices of n-alkanes include main peak carbon, carbon number distribution, CPI, OEP, Pr/Ph, Pr/C17, Ph/C18, from these indices, the source of n-alkanes in Taihu Lake water can be explored.