Table 2.
Measured and predicted stable carbon isotopic compositions of levoglucosan and LMT.
| Suppliers | δ 13Ca | |||
|---|---|---|---|---|
| Measured levoglucosanb,c | Measured LMTb,d,e | Calculated LMT f | Δg | |
| S1 | −15.65 ± 0.08 (n = 3) |
−24.53 ± 0.13 (n = 3) |
−24.32 | 0.21 |
| S2 | −14.45 ± 0.03 (n = 3) |
−23.69 ± 0.21 (n = 3) |
−23.60 | 0.09 |
| S3 | −12.20 ± 0.10 (n = 3) |
−22.61 ± 0.18 (n = 4) |
−22.25 | 0.36 |
| S4 | −27.48 ± 0.07 (n = 3) |
−31.56 ± 0.18 (n = 4) |
−31.42 | 0.14 |
aStable carbon isotopic compositions reported in per mil relative to PDB; bthe arithmetic means and standard deviations; cδ13C values determined by EA/IRMS; dδ13C values determined by GC/C/IRMS; eδ13CMBA = −59.42 ± 0.13‰ (n = 3, determined by EA/IRMS) δ13CTMS = −29.96 and was obtained by reacting the same batch of MSTFA with myo-inositol standard (δ13C = −14.65 ± 0.03‰; n = 3, determined by EA/IRMS); fon the basis of the mass balance relationship equation (1); gcalculated δ13CLMT-measured δ13CLMT; n: number of measured times.