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Assessing the extraction and quantification of amorphous silica in soils of forest and grassland ecosystems

Saccone, L; Conley, Daniel LU ; Koning, E; Sommer, M; Kaczorek, D; Blecker, SW and Kelly, EF (2007) In European Journal of Soil Science 58. p.1446-1459
Abstract
The objective of this study was to evaluate different methodologies with regard to their ability to extract the amorphous silica (ASi) content of soils from diverse geochemical settings. The methods used in this work included three acid extraction techniques (oxalate, citrate and acetate) and two alkaline extraction techniques (sodium carbonate and sodium hydroxide) which are more commonly used for the measurement of ASi in aquatic sediments. Our results indicate that the amount of Si extracted from phytolith samples with the acid methods was an order of magnitude lower than the amount of Si extracted using alkaline extractions. When applied to natural soil samples, these extractions show that the acid techniques are only able to extract... (More)
The objective of this study was to evaluate different methodologies with regard to their ability to extract the amorphous silica (ASi) content of soils from diverse geochemical settings. The methods used in this work included three acid extraction techniques (oxalate, citrate and acetate) and two alkaline extraction techniques (sodium carbonate and sodium hydroxide) which are more commonly used for the measurement of ASi in aquatic sediments. Our results indicate that the amount of Si extracted from phytolith samples with the acid methods was an order of magnitude lower than the amount of Si extracted using alkaline extractions. When applied to natural soil samples, these extractions show that the acid techniques are only able to extract loosely bound components such as adsorbed Si and Si bound in amorphous matrices with Al and Fe. While sodium carbonate or sodium hydroxide extracted the same amount of ASi in Podzols, sodium carbonate was able to extract only part of the ASi extracted with sodium hydroxide in Chernozems. Pre-treatment of the samples with hydrochloric acid before the sodium carbonate extraction did not increase amounts of ASi extracted. The present work suggests that alkaline methods used commonly for ASi on aquatic sediment samples can be used on a wide variety of soils, even if in some cases a stronger base is required to completely dissolve ASi from certain soil types where older and less reactive ASi fractions are present. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
amorphous silica, biogenic silica, soil
in
European Journal of Soil Science
volume
58
pages
1446 - 1459
publisher
Wiley-Blackwell
external identifiers
  • wos:000251026300022
  • scopus:36249020846
ISSN
1365-2389
DOI
10.1111/j.1365-2389.2007.00949.x
language
English
LU publication?
no
id
eb28b32f-f746-4998-8670-91c22d816e46 (old id 829614)
date added to LUP
2008-02-05 11:28:27
date last changed
2017-11-19 03:40:16
@article{eb28b32f-f746-4998-8670-91c22d816e46,
  abstract     = {The objective of this study was to evaluate different methodologies with regard to their ability to extract the amorphous silica (ASi) content of soils from diverse geochemical settings. The methods used in this work included three acid extraction techniques (oxalate, citrate and acetate) and two alkaline extraction techniques (sodium carbonate and sodium hydroxide) which are more commonly used for the measurement of ASi in aquatic sediments. Our results indicate that the amount of Si extracted from phytolith samples with the acid methods was an order of magnitude lower than the amount of Si extracted using alkaline extractions. When applied to natural soil samples, these extractions show that the acid techniques are only able to extract loosely bound components such as adsorbed Si and Si bound in amorphous matrices with Al and Fe. While sodium carbonate or sodium hydroxide extracted the same amount of ASi in Podzols, sodium carbonate was able to extract only part of the ASi extracted with sodium hydroxide in Chernozems. Pre-treatment of the samples with hydrochloric acid before the sodium carbonate extraction did not increase amounts of ASi extracted. The present work suggests that alkaline methods used commonly for ASi on aquatic sediment samples can be used on a wide variety of soils, even if in some cases a stronger base is required to completely dissolve ASi from certain soil types where older and less reactive ASi fractions are present.},
  author       = {Saccone, L and Conley, Daniel and Koning, E and Sommer, M and Kaczorek, D and Blecker, SW and Kelly, EF},
  issn         = {1365-2389},
  keyword      = {amorphous silica,biogenic silica,soil},
  language     = {eng},
  pages        = {1446--1459},
  publisher    = {Wiley-Blackwell},
  series       = {European Journal of Soil Science},
  title        = {Assessing the extraction and quantification of amorphous silica in soils of forest and grassland ecosystems},
  url          = {http://dx.doi.org/10.1111/j.1365-2389.2007.00949.x},
  volume       = {58},
  year         = {2007},
}