The error in stream sediment phosphorus fractionation and sorption properties effected by drying pretreatments
dc.contributor.author | Simpson, ZP | |
dc.contributor.author | McDowell, Richard | |
dc.contributor.author | Condron, LM | |
dc.date.accessioned | 2019-11-18T22:56:23Z | |
dc.date.available | 2018-10-27 | |
dc.date.issued | 2019-03-11 | |
dc.date.submitted | 2018-10-22 | |
dc.description.abstract | Purpose: Stream sediment can control phosphorus (P) in the water column at baseflow. Two common laboratory analyses of sediment P are the equilibrium phosphate concentration at net zero sorption (EPC₀ ) and P fractionation. Good sample handling ensures representative results, but oftentimes, studies rely on air-dried or freeze-dried samples, which alters sediment biogeochemistry. How and to what extent this influences EPC₀ and P fractionation remains unclear. We therefore examine pretreatment effects on sediment EPC₀ and P fractionation. Materials and methods: We collected fine sediments (< 2 mm) from streams in the Tukituki River and Reporoa Basins in New Zealand (n = 31 sediments). Subsamples were then either kept fresh, frozen then lyophilized (freeze-dried), or dried at 40 °C for 2 weeks (air-dried). Measurements of EPC₀ and P fractionation were made in triplicate. The sequential P fractionation scheme determined five different P pools: NH₄ Cl (labile P), NaOH reactive P (RP; metal oxide-bound P) and unreactive P (URP; organic P), HCl (Ca-mineral P), and residual P. Along with statistical comparisons between fresh results and the two pre-treatments, we explored correlations between pre-treatment effects and sediment physicochemical characteristics. Results and discussion: The sediments had generally low EPC₀ (majority < 0.020 mg P L⁻¹), and uncertainty in EPC₀ increased with concentration magnitude. While there were sediment-specific changes in EPC₀ with pre-treatment, there was no consistent bias caused by pre-treatment. However, the differences between the fresh and air-dried sediment EPC₀ were larger and more variable than between fresh and freeze-dried sediment. For P fractionation, the Tukituki sediments were enriched in HCl-P, while Reporoa sediments had more NaOH-RP and NaOH-URP. Despite large sediment-specific changes, the overall effects of freeze- and air-drying sediment were increased NH₄ Cl-P (estimated average effect, θ̂ = + 0.63 and + 3.7 mg P kg⁻¹ ), no significant changes for NaOH-RP, contrasting changes in NaOH-URP (− 3.4 and + 3.3 mg P kg⁻¹ ), and decreased HCl-P (− 40 and − 33 mg P kg −1 ). Conclusions: We found that drying sediment significantly influenced EPC₀ and P fractions (especially the NH₄Cl-P fraction). Air-drying was particularly error-prone and should be avoided. The use of freeze-drying to preserve samples for later analyses and improve ease of handling may be used with appropriate consideration of the research objectives and the error introduced by freeze-drying. However, we recommend using fresh sediments for analyses whenever possible, as they best represent natural conditions. | |
dc.format.extent | pp.1587-1597 | |
dc.identifier | https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=elements_prod&SrcAuth=WosAPI&KeyUT=WOS:000459805400048&DestLinkType=FullRecord&DestApp=WOS_CPL | |
dc.identifier.doi | 10.1007/s11368-018-2180-3 | |
dc.identifier.eissn | 1614-7480 | |
dc.identifier.issn | 1439-0108 | |
dc.identifier.other | HM9LH (isidoc) | |
dc.identifier.uri | https://hdl.handle.net/10182/11085 | |
dc.language | en | |
dc.language.iso | en | |
dc.publisher | Springer | |
dc.relation | The original publication is available from Springer - https://doi.org/10.1007/s11368-018-2180-3 - http://dx.doi.org/10.1007/s11368-018-2180-3 | |
dc.relation.isPartOf | Journal of Soils and Sediments | |
dc.relation.uri | https://doi.org/10.1007/s11368-018-2180-3 | |
dc.rights | © Springer-Verlag GmbH Germany, part of Springer Nature 2018 | |
dc.subject | fractionation | |
dc.subject | phosphorus | |
dc.subject | Sediment | |
dc.subject | Sorption | |
dc.subject.anzsrc2020 | ANZSRC::30 Agricultural, veterinary and food sciences | |
dc.subject.anzsrc2020 | ANZSRC::37 Earth sciences | |
dc.subject.anzsrc2020 | ANZSRC::41 Environmental sciences | |
dc.title | The error in stream sediment phosphorus fractionation and sorption properties effected by drying pretreatments | |
dc.type | Journal Article | |
lu.contributor.unit | LU | |
lu.contributor.unit | LU|Agriculture and Life Sciences | |
lu.contributor.unit | LU|Agriculture and Life Sciences|SOILS | |
lu.contributor.unit | LU|Research Management Office | |
lu.contributor.unit | LU|Research Management Office|OLD QE18 | |
lu.identifier.orcid | 0000-0003-3911-4825 | |
pubs.issue | 3 | |
pubs.publication-status | Published | |
pubs.publisher-url | http://dx.doi.org/10.1007/s11368-018-2180-3 | |
pubs.volume | 19 |