@article{fdi:010061481,
  title = {{A}ssessment of the 1% {N}a2{CO}3 technique to quantify the phytolith pool},
  author = {{M}eunier, {J}. {D}. and {K}eller, {C}. and {G}untzer, {F}. and {R}iotte, {J}ean and {B}raun, {J}. {J}. and {A}nupama, {K}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A}morphous silica ({AS}i) pool and fluxes have become parameters of a growing interest in the understanding of the biogeochemical cycle of {S}i and the modeling of anthropogenic impacts. {E}xtraction by 1% {N}a2{CO}3 followed by a correction for crystalline {S}i ({D}e{M}aster, 1981) has recently become widely used and is proposed as the standard technique for quantifying amorphous silica ({AS}i) pools in soil and continental aquatic environments. {H}owever, the 1% {N}a2{CO}3 method was developed to quantify diatom frustules and not phytoliths ({P}h{S}i), which constitute the most common fraction of {AS}i in soils. {T}he aim of this study was to assess the 1% {N}a2{CO}3 method for fresh and aged phytoliths. {W}e founded a significant positive correlation between {S}i extracted by the 1% {N}a2{CO}3 method and {S}i extracted by other standard procedures ({G}untzer et al., 2010) for various shoot samples (elm, horsetail, fern and larch). {B}ecause the {S}i shoot samples are mainly composed of phytoliths, we concluded that the 1% {N}a2{CO}3 method was well adapted for the determination of {P}h{S}i of fresh phytoliths containing less than 70 mg {S}i g(-1). {T}o assess the 1% {N}a2{CO}3 method for {P}h{S}i of aged phytoliths, we used artificial mixtures of soil phytoliths from {L}a {R}eunion ({M}eunier et at, 1999) and quartz. {O}ur results showed that the 1% {N}a2{CO}3 method underestimated {P}h{S}i for aged phytoliths by a factor of 3.7. {C}ombining the 1% {N}a2{CO}3 method and a physical method of extraction using samples of various origins showed a dispersion of the data that can be explained by a combination of several factors including loss during physical extraction and the presence of resistant phytoliths. {I}n the absence of standard technique, we recommend to check the nature of the particles using physical extraction in combination with the 1% {N}a2{CO}3 in order to provide a more careful analysis of {AS}i.},
  keywords = {{A}morphous silica ; {B}iogeochemical cycle ; {P}hytolith ; {W}et-alkaline ; extraction},
  booktitle = {},
  journal = {{G}eoderma},
  volume = {216},
  numero = {},
  pages = {30--35},
  ISSN = {0016-7061},
  year = {2014},
  DOI = {10.1016/j.geoderma.2013.10.014},
  URL = {https://www.documentation.ird.fr/hor/fdi:010061481},
}