Details
| Original language | English |
|---|---|
| Pages (from-to) | 587-595 |
| Number of pages | 9 |
| Journal | Journal of Plant Nutrition and Soil Science |
| Volume | 174 |
| Issue number | 4 |
| Publication status | Published - 1 Aug 2011 |
Abstract
Different procedures to investigate dissolved trace element concentration at the transition from unsaturated to saturated zone in soils were compared by concurrent sampling of soil solution and solid soil material in this zone. The in situ sampled soil solution from the percolated water was used to measure in situ concentrations, while solid soil material was used to measure concentrations at two liquid-solid ratios using batch experiments on 250 sample pairs. The liquid-solid ratios were 2 Lkg -1 and 5 Lkg -1. At 5 Lkg -1, the ionic strength was adjusted with Ca(NO 3) 2 to a sample-specific value similar to in situ, while at 2 Lkg -1, the ionic strength was not adjusted. The extracted concentrations of most trace elements exhibited a statistically significant but weak correlation (p value < 0.01) to the corresponding in situ concentrations. In the liquid-solid ratio of 2 Lkg -1 extracts, Pb and Cr showed very poor comparability with the in situ equivalent. A likely cause was the enhanced dissolved-organic-C release in the extract due to the lower ionic strength compared to in situ conditions in combination with effects from drying and moistening soil samples. For the other elements, correlation increased in the order As < Cu, Zn, Sb, Mo, V < Cd, Ni, Co where adjustment of the ionic strength led to slightly better results. In addition to the element-specific shortcomings, it appeared that low concentration levels of in situ concentrations were generally underestimated by batch extraction methods. The liquid-solid ratio of 2 Lkg -1 extracts could only be used as a method to predict exceedance of thresholds if a safety margin of approximately one order of magnitude higher than the thresholds was adopted. The ability of the batch-extraction methods to estimate in situ concentrations was equally limited.
Keywords
- Batch experiments, Field-laboratory comparison of trace element extraction, Ionic-strength adjustment, Soil solution, Water-soluble trace element concentration
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- Soil Science
- Agricultural and Biological Sciences(all)
- Plant Science
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In: Journal of Plant Nutrition and Soil Science, Vol. 174, No. 4, 01.08.2011, p. 587-595.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Comparing concurrent in situ and batch-extracted trace element concentrations
AU - Godbersen, Levke
AU - Utermann, Jens
AU - Duijnisveld, Wilhelmus H.M.
AU - Altfelder, Sven
AU - Kuhnt, Gerald
AU - Böttcher, Jürgen
PY - 2011/8/1
Y1 - 2011/8/1
N2 - Different procedures to investigate dissolved trace element concentration at the transition from unsaturated to saturated zone in soils were compared by concurrent sampling of soil solution and solid soil material in this zone. The in situ sampled soil solution from the percolated water was used to measure in situ concentrations, while solid soil material was used to measure concentrations at two liquid-solid ratios using batch experiments on 250 sample pairs. The liquid-solid ratios were 2 Lkg -1 and 5 Lkg -1. At 5 Lkg -1, the ionic strength was adjusted with Ca(NO 3) 2 to a sample-specific value similar to in situ, while at 2 Lkg -1, the ionic strength was not adjusted. The extracted concentrations of most trace elements exhibited a statistically significant but weak correlation (p value < 0.01) to the corresponding in situ concentrations. In the liquid-solid ratio of 2 Lkg -1 extracts, Pb and Cr showed very poor comparability with the in situ equivalent. A likely cause was the enhanced dissolved-organic-C release in the extract due to the lower ionic strength compared to in situ conditions in combination with effects from drying and moistening soil samples. For the other elements, correlation increased in the order As < Cu, Zn, Sb, Mo, V < Cd, Ni, Co where adjustment of the ionic strength led to slightly better results. In addition to the element-specific shortcomings, it appeared that low concentration levels of in situ concentrations were generally underestimated by batch extraction methods. The liquid-solid ratio of 2 Lkg -1 extracts could only be used as a method to predict exceedance of thresholds if a safety margin of approximately one order of magnitude higher than the thresholds was adopted. The ability of the batch-extraction methods to estimate in situ concentrations was equally limited.
AB - Different procedures to investigate dissolved trace element concentration at the transition from unsaturated to saturated zone in soils were compared by concurrent sampling of soil solution and solid soil material in this zone. The in situ sampled soil solution from the percolated water was used to measure in situ concentrations, while solid soil material was used to measure concentrations at two liquid-solid ratios using batch experiments on 250 sample pairs. The liquid-solid ratios were 2 Lkg -1 and 5 Lkg -1. At 5 Lkg -1, the ionic strength was adjusted with Ca(NO 3) 2 to a sample-specific value similar to in situ, while at 2 Lkg -1, the ionic strength was not adjusted. The extracted concentrations of most trace elements exhibited a statistically significant but weak correlation (p value < 0.01) to the corresponding in situ concentrations. In the liquid-solid ratio of 2 Lkg -1 extracts, Pb and Cr showed very poor comparability with the in situ equivalent. A likely cause was the enhanced dissolved-organic-C release in the extract due to the lower ionic strength compared to in situ conditions in combination with effects from drying and moistening soil samples. For the other elements, correlation increased in the order As < Cu, Zn, Sb, Mo, V < Cd, Ni, Co where adjustment of the ionic strength led to slightly better results. In addition to the element-specific shortcomings, it appeared that low concentration levels of in situ concentrations were generally underestimated by batch extraction methods. The liquid-solid ratio of 2 Lkg -1 extracts could only be used as a method to predict exceedance of thresholds if a safety margin of approximately one order of magnitude higher than the thresholds was adopted. The ability of the batch-extraction methods to estimate in situ concentrations was equally limited.
KW - Batch experiments
KW - Field-laboratory comparison of trace element extraction
KW - Ionic-strength adjustment
KW - Soil solution
KW - Water-soluble trace element concentration
UR - http://www.scopus.com/inward/record.url?scp=79960942004&partnerID=8YFLogxK
U2 - 10.1002/jpln.201000274
DO - 10.1002/jpln.201000274
M3 - Article
AN - SCOPUS:79960942004
VL - 174
SP - 587
EP - 595
JO - Journal of Plant Nutrition and Soil Science
JF - Journal of Plant Nutrition and Soil Science
SN - 1436-8730
IS - 4
ER -