@article{PAR00013619,
  title = {{A}lkaline-extractable silicon from land to ocean : a challenge for biogenic silicon determination},
  author = {{B}arao, {L}. and {V}andevenne, {F}. and {C}lymans, {W}. and {F}rings, {P}. and {R}agueneau, {O}livier and {M}eire, {P}. and {C}onley, {D}. {J}. and {S}truyf, {E}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he biogeochemical cycling of silicon ({S}i) along the land-to-ocean continuum is studied by a variety of research fields and for a variety of scientific reasons. {H}owever, there is an increasing need to refine the methodology and the underlying assumptions used to determine biogenic silica ({BS}i) concentrations. {R}ecent evidence suggests that contributions of nonbiogenic sources of {S}i dissolving during alkaline extractions, not corrected by standard silicate mineral dissolution correction protocols, can be substantial. {T}he ratio between dissolved {S}i and aluminum ({A}l) monitored continuously during the alkaline extraction can be used to infer the origin of the {S}i fractions present. {I}n this study, we applied both a continuous analysis method (0.5 {M} {N}a{OH}) and a traditional 0.1 {M} {N}a2{CO}3 extraction to a wide array of samples: (1) terrestrial vegetation, (2) soils from forest, cropland and pasture, (3) lake sediments, (4) suspended particulate matter and sediments from rivers, (5) sediments from estuaries and salt marshes and (6) ocean sediments. {O}ur results indicate that the 0.1 {M} {N}a2{CO}3 extraction protocol can overestimate the {BS}i content, by simultaneously dissolving {S}i fractions of nonbiogenic origin that may represent up to 100% of the {S}i traditionally considered as biogenic, hampering interpretation especially in some deeper soil horizons, rivers and coastal oceanic sediments. {M}oreover, although the term amorphous {S}i was coined to reflect a growing awareness of nonbiogenic phases we show it is actually inappropriate in samples where silicate minerals may account for a large part of the extracted {S}i even after linear mineral correction.},
  keywords = {},
  booktitle = {},
  journal = {{L}imnology and {O}ceanography-{M}ethods},
  volume = {13},
  numero = {7},
  pages = {329--344},
  ISSN = {1541-5856},
  year = {2015},
  DOI = {10.1002/lom3.10028},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00013619},
}