FN Archimer Export Format
PT J
TI Alkaline-extractable silicon from land to ocean: A challenge for biogenic silicon determination
BT 
AF BARAO, Lucia
   VANDEVENNE, Floor
   CLYMANS, Wim
   FRINGS, Patrick
   RAGUENEAU, Olivier
   MEIRE, Patrick
   CONLEY, Daniel J.
   STRUYF, Eric
AS 1:1;2:1;3:2;4:2;5:3;6:1;7:2;8:1;
FF 1:;2:;3:;4:;5:;6:;7:;8:;
C1 Univ Antwerp, Dept Biol, Ecosyst Management Res Grp, Antwerp, Belgium.
   Lund Univ, Dept Geol, Lund, Sweden.
   Inst Univ Europeen Mer, UMR CNRS UBO IRD IFREMER 6539, Dept Environm & Ressources, Lab Sci Environm Marin, Plouzane, France.
C2 UNIV ANTWERP, BELGIUM
   UNIV LUND, SWEDEN
   UBO, FRANCE
UM LEMAR
IF 2.008
TC 37
UR https://archimer.ifremer.fr/doc/00276/38725/73177.pdf
LA English
DT Article
AB The biogeochemical cycling of silicon (Si) along the land-to-ocean continuum is studied by a variety of research fields and for a variety of scientific reasons. However, there is an increasing need to refine the methodology and the underlying assumptions used to determine biogenic silica (BSi) concentrations. Recent evidence suggests that contributions of nonbiogenic sources of Si dissolving during alkaline extractions, not corrected by standard silicate mineral dissolution correction protocols, can be substantial. The ratio between dissolved Si and aluminum (Al) monitored continuously during the alkaline extraction can be used to infer the origin of the Si fractions present. In this study, we applied both a continuous analysis method (0.5 M NaOH) and a traditional 0.1 M Na2CO3 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. Our results indicate that the 0.1 M Na2CO3 extraction protocol can overestimate the BSi content, by simultaneously dissolving Si fractions of nonbiogenic origin that may represent up to 100% of the Si traditionally considered as biogenic, hampering interpretation especially in some deeper soil horizons, rivers and coastal oceanic sediments. Moreover, although the term amorphous Si 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 Si even after linear mineral correction. 
PY 2015
PD JUN
SO Limnology And Oceanography-methods
SN 1541-5856
PU Wiley-blackwell
VL 13
IS 7
UT 000358999300001
BP 329
EP 344
DI 10.1002/lom3.10028
ID 38725
ER

EF