Publication Details |
| Category | Text Publication |
| Reference Category | Journals |
| DOI | 10.1016/j.aca.2006.03.114 |
| Title (Primary) | On-line dynamic fractionation and automatic determination of inorganic phosphorus in environmental solid substrates exploiting sequential injection microcolumn extraction and flow injection analysis |
| Author | Buanuam, J.; Miró, M.; Hansen, E.H.; Shiowatana, J. |
| Source Titel | Analytica Chimica Acta |
| Year | 2006 |
| Department | ANA |
| Volume | 570 |
| Issue | 2 |
| Page From | 224 |
| Page To | 231 |
| Language | englisch |
| Abstract | Sequential injection microcolumn extraction (SI-MCE) based on the implementation of a soil-containing microcartridge as external reactor in a sequential injection network is, for the first time, proposed for dynamic fractionation of macronutrients in environmental solids, as exemplified by the partitioning of inorganic phosphorus in agricultural soils. The on-line fractionation method capitalises on the accurate metering and sequential exposure of the various extractants to the solid sample by application of programmable flow as precisely coordinated by a syringe pump. Three different soil phase associations for phosphorus, that is, exchangeable, Al- and Fe-bound, and Ca-bound fractions, were elucidated by accommodation in the flow manifold of the three steps of the Hieltjes-Lijklema (HL) scheme involving the use of 1.0 M NH4 Cl, 0.1 M NaOH and 0.5 M HCl, respectively, as sequential leaching reagents. The precise timing and versatility of SI for tailoring various operational extraction modes were utilized for investigating the extractability and the extent of phosphorus re-distribution for variable partitioning times. Automatic spectrophotometric determination of soluble reactive phosphor-us in soil extracts was performed by a flow injection (H) analyser based on the Molybdenum Blue (MB) chemistry. The 3 sigma detection limit was 0.02 mg P L-1 while the linear dynamic range extended up to 20 mg P L-1 regardless of the extracting media. Despite the variable chemical composition of the HL extracts, a single FI set-up was assembled with no need for either manifold re-configuration or modification of chemical composition of reagents. The mobilization of trace elements, such as Cd, often present in grazed pastures as a result of the application of phosphate fertilizers, was also explored in the HL fractions by electrothermal atomic absorption spectrometry. (c) 2006 Elsevier B.V. All rights reserved |
| Persistent UFZ Identifier | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=2555 |
| Buanuam, J., Miró, M., Hansen, E.H., Shiowatana, J. (2006): On-line dynamic fractionation and automatic determination of inorganic phosphorus in environmental solid substrates exploiting sequential injection microcolumn extraction and flow injection analysis Anal. Chim. Acta 570 (2), 224 - 231 10.1016/j.aca.2006.03.114 |
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