Sample Fractionation

MaterialDelta C-13 (per mille)
Marine HCO3-12
Marine CO302
PDB dC13 standard0
Soil CO2 and secondary bone carbonate-53
Speleothems-93
Atmospheric CO2-92
Bone apatite and original carbonate-123
Grains, seeds, maize and millet (C-4 plants)-102
ANU (Australian National University) sucrose C14 standard-110.5
Freshwater plants (submerged)-164
Grasses arid zone, sedges-133
Straw, flax-143
Marine organisms (organic)-153
Freshwater plants (submerged)-164
Succulents (Cactus, pineapple, etc)-172
Oxalic acid 2 C14 standard-172
Bone collagen (C3 diet), wood cellulose-202
C3 plants, Grains (wheat, etc). Graphite, coal-233
Fossil wood, charcoal-243
Recent wood, charcoal-253
Tree leaves, Wheat, straw etc.-272
Peat, humus-273

References:
Gupta, S.K and Polach, H.A (1985:114), Aitken, (1993).

Corrections to C14 dates

Radiocarbon WEB-info