@article{PAR00002291,
  title = {{IR} laser extraction technique applied to oxygen isotope analysis of small biogenic silica samples},
  author = {{C}respin, {J}. and {A}lexandre, {A}. and {S}ylvestre, {F}lorence and {S}onzogni, {C}. and {P}ailles, {C}. and {G}arreta, {V}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A}n {IR}-laser fluorination technique is reported here for analyzing the oxygen isotope composition (delta {O}-18) of microscopic biogenic silica grains (phytoliths and diatoms). {P}erformed after a controlled isotopic exchanged ({CIE}) procedure, the laser fluorination technique that allows one to visually check the success of the fluorination reaction is faster than the conventional fluorination technique and allows analyzing delta {O}-18 of small to minute samples (1.6-0.3 mg) as required for high-resolution paleoenvironmental reconstructions. {T}he long-term reproducibility achieved with the {IR} laser-heating fluorination/{O}-2 delta {O}-18 analysis is lower than or equal to +/- 0.26 parts per thousand (1 {SD}; n = 99) for phytoliths and +/- 0.17 parts per thousand (1 {SD}; n = 47) for diatoms. {W}hen several {CIE} are taken into account in the {SD} calculation, the resulting reproducibility is lower than or equal to +/- 0.51 parts per thousand for phytoliths (1 {SD}; n = 99; {CIE} > 5) and +/- 0.54 parts per thousand (1 {SD}; n = 47; {CIE} = 13) for diatoms. {A} minimum reproducibility of +/- 0.5 parts per thousand leads to an estimated uncertainty on delta {O}-18(silica) close to +/- 0.5 parts per thousand. {R}esulting uncertainties on reconstructed temperature and delta {O}-18(forming) (water) are, respectively, +/- 2 degrees {C} and +/- 0.5 parts per thousand and fit in the precisions required for intertropical paleoenvironmental reconstructions. {S}everal methodological points such as optimal extraction protocols and the necessity or not of performing two {CIE} prior to oxygen extraction are assessed.},
  keywords = {},
  booktitle = {},
  journal = {{A}nalytical {C}hemistry},
  volume = {80},
  numero = {7},
  pages = {2372--2378},
  ISSN = {0003-2700},
  year = {2008},
  DOI = {10.1021/ac071475c},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00002291},
}