Δ13C
pada geokimia, paleoklimatologi dan paleoseanografi, δ13C (dieja "delta c tigabelas") adalah sebuah jejak isotopik, sebuah pengukuran rasio dua isotop stabil karbon—13C and 12C—dihitung menggunakan bagian per seribu (per mil, ‰).[1] Pengukuran ini juga sering digunakan pada arkeologi untuk rekonstruksi diet (makanan) hewan purba, terkhususnya mencari bukti konsumsi makanan laut atau tumbuh-tumbuhan tertentu.[2]
Definisinya, pada per mille adalah:
![{\displaystyle \delta {{\vphantom {A}}_{\hphantom {}}^{\hphantom {13}}{\mkern {-1.5mu}}{\vphantom {A}}_{{\vphantom {2}}{\llap {\smash[{t}]{}}}}^{{\smash[{t}]{\vphantom {2}}}{\llap {13}}}\mathrm {C} }=\left({\frac {({{\vphantom {A}}_{\hphantom {}}^{\hphantom {13}}{\mkern {-1.5mu}}{\vphantom {A}}_{{\vphantom {2}}{\llap {\smash[{t}]{}}}}^{{\smash[{t}]{\vphantom {2}}}{\llap {13}}}\mathrm {C} }/{{\vphantom {A}}_{\hphantom {}}^{\hphantom {12}}{\mkern {-1.5mu}}{\vphantom {A}}_{{\vphantom {2}}{\llap {\smash[{t}]{}}}}^{{\smash[{t}]{\vphantom {2}}}{\llap {12}}}\mathrm {C} })_{\mathrm {sampel} }}{({{\vphantom {A}}_{\hphantom {}}^{\hphantom {13}}{\mkern {-1.5mu}}{\vphantom {A}}_{{\vphantom {2}}{\llap {\smash[{t}]{}}}}^{{\smash[{t}]{\vphantom {2}}}{\llap {13}}}\mathrm {C} }/{{\vphantom {A}}_{\hphantom {}}^{\hphantom {12}}{\mkern {-1.5mu}}{\vphantom {A}}_{{\vphantom {2}}{\llap {\smash[{t}]{}}}}^{{\smash[{t}]{\vphantom {2}}}{\llap {12}}}\mathrm {C} })_{\mathrm {standard} }}}-1\right)\times 1000}](https://wikimedia.org/api/rest_v1/media/math/render/svg/110d22b4ae5a17b79d06e7d98fa3cb17a951739c)
yang mana "standar" mengacu kepada sebuah material rujukan yang telah mapan.
Referensi
- ^ Libes, Susan M. (1992). Introduction to Marine Biogeochemistry, 1st edition. New York: Wiley.
- ^ Schwarcz, Henry P.; Schoeninger, Margaret J. (1991). "Stable isotope analyses in human nutritional ecology". American Journal of Physical Anthropology. 34 (S13): 283–321. doi:10.1002/ajpa.1330340613.
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