Comparison of soluble reactive phosphorus and orthophosphate concentrations in river waters

Maruo, Masahiro; Ishimaru, Mana; Azumi, Yuma; Kawasumi, Yuki; Nagafuchi, Osamu; Obata, Hajime

doi:10.1007/s10201-015-0463-6

Cited by 15 publications

(9 citation statements)

References 18 publications

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“…Second, ambient DRP concentrations may be too high and could preclude measurable desorption points. Third, ambient DRP concentrations in environmental waters are not equivalent to phosphate concentrations: we assume that the reacting species in P sorption assays is primarily orthophosphate but DRP can include other P species (e.g., labile organic or colloid‐bound species) that are detected by the common molybdenum‐blue method (Haygarth et al., 1997; Maruo et al., 2016; Nagul et al., 2015; Worsfold et al., 2016). Hence, in waters where these interferences are likely (e.g., Jansson et al., 2012), the part of DRP that is not phosphate can positively bias the EPC 0 .…”

Section: Discussionmentioning

confidence: 99%

Sediment phosphorus buffering in streams at baseflow: A meta‐analysis

et al. 2021

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Phosphorus (P) pollution of surface waters remains a challenge for protecting and improving water quality. Central to the challenge is understanding what regulates P concentrations in streams. This quantitative review synthesizes the literature on a major control of P concentrations in streams at baseflow-the sediment P bufferto better understand streamwater-sediment P interactions. We conducted a global meta-analysis of sediment equilibrium phosphate concentrations at net zero sorption (EPC 0), which is the dissolved reactive P (DRP) concentration toward which sediments buffer solution DRP. Our analysis of 45 studies and >900 paired observations of DRP and EPC 0 showed that sediments often have potential to remove or release P to the streamwater (83% of observations), meaning that "equilibrium" between sediment and streamwater is rare. This potential for P exchange is moderated by sediment and stream characteristics, including sorption affinity, stream pH, exchangeable P concentration, and particle sizes. The potential for sediments to modify streamwater DRP concentrations is often not realized owing to other factors (e.g., hydrologic interactions). Sediment surface chemistry, hyporheic exchange, and biota can also influence the potential exchange of P between sediments and the streamwater. Methodological choices significantly influenced EPC 0 determination and thus the estimated potential for P exchange; we therefore discuss how to measure and report EPC 0 to best suit research objectives and aid in interstudy comparison. Our results enhance understanding of the sediment P buffer and inform how EPC 0 can be effectively applied to improve management of aquatic P pollution and eutrophication.

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Section: Discussionmentioning

confidence: 99%

Sediment phosphorus buffering in streams at baseflow: A meta‐analysis

et al. 2021

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“…In streams and lakes, P is found in dissolved and particulate forms; in dissolved form, soluble reactive phosphorus (SRP) is the amount of phosphorus directly available for plants. This phosphorus fraction consists mainly of the inorganic orthophosphates (o-PO 4 , H 3 PO 4 , H 2 PO 4and HPO 4 2-) (Maruo et al, 2016). Particulate forms (organic or mineral) were in permanent exchange with dissolved forms under the action of microorganisms and adsorption/desorption mechanisms.…”

Section: Introductionmentioning

confidence: 99%

In situ chelation of phosphorus using microencapsulated aluminum and iron sulfate to bind intestinal phosphorus in rainbow trout (Oncorhynchus mykiss)

Ndiaye

Deschamps

Comeau

et al. 2020

Animal Feed Science and Technology

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“…Nevertheless, this estimate was higher than the Pi in the samples; it is known that SRP measured by the molybdenum-blue method includes P species other than orthophosphate, 38 explaining this overestimation. Recently, Maruo et al 39 reported that the ratio of orthophosphate to SRP in river and lake water samples collected from the Lake Biwa Watershed varied widely from 0.06 to 0.79, requiring more than 10 times the volume of water we collected to obtain enough Ag 3 PO 4 . Accordingly, it is recommended that water samples of volume much larger than needed be collected for the δ 18 O PO 4 analysis, 7 assuming that the freshwater samples have a low orthophosphate-to-SRP ratio.…”

Section: Resultsmentioning

confidence: 99%

Identification of Phosphorus Sources in a Watershed Using a Phosphate Oxygen Isoscape Approach

Ishida

Uehara

Iwata

et al. 2019

Environ. Sci. Technol.

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Identifying nonpoint phosphorus (P) sources in a watershed is essential for addressing cultural eutrophication and for proposing best-management solutions. The oxygen isotope ratio of phosphate (δ18OPO4 ) can shed light on P sources and P cycling in ecosystems. This is the first assessment of the δ18OPO4 distribution in a whole catchment, namely, the Yasu River Watershed in Japan. The observed δ18OPO4 values in the river water varied spatially from 10.3‰ to 17.6‰. To identify P sources in the watershed, we used an isoscape approach involving a multiple-linear-regression model based on land use and lithological types. We constructed two isoscape models, one using data only from the whole watershed and the other using data from the small tributaries. The model results explain 69% and 96% of the spatial variation in the river water δ18OPO4 . The lower R 2 value for the whole watershed model is attributed to the relatively large travel time for P in the main stream of the lower catchment that can result in cumulative biological P recycling. Isoscape maps and a correlation analysis reveal the relative importance of P loading from paddy fields and bedrock. This work demonstrates the utility of δ18OPO4 isoscape models for assessing nonpoint P sources in watershed ecosystems.

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Comparison of soluble reactive phosphorus and orthophosphate concentrations in river waters

Cited by 15 publications

References 18 publications

Sediment phosphorus buffering in streams at baseflow: A meta‐analysis

Sediment phosphorus buffering in streams at baseflow: A meta‐analysis

In situ chelation of phosphorus using microencapsulated aluminum and iron sulfate to bind intestinal phosphorus in rainbow trout (Oncorhynchus mykiss)

Identification of Phosphorus Sources in a Watershed Using a Phosphate Oxygen Isoscape Approach

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