Stream transport of iron and phosphorus by authigenic nanoparticles in the Southern Piedmont of the U.S.

River, Mark; Richardson, Curtis J.

doi:10.1016/j.watres.2017.12.004

Cited by 19 publications

(11 citation statements)

References 42 publications

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“…While our study focused on quantifying four P fractions (Figure ), future studies could more finely characterize P fractions and their mobility/lability under variable biogeochemical and redox conditions. In particulate, there appear to be important but understudied P forms in aquatic ecosystems, such as nanoparticle phosphorus (i.e., River & Richardson, ). The prevalence of these P forms in urban environments has yet to be assessed and may help understand patterns described here.…”

Section: Discussionmentioning

confidence: 99%

Mobility and Bioavailability of Sediment Phosphorus in Urban Stormwater Ponds

Frost

Prater

Scott

et al. 2019

Water Resources Research

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Stormwater ponds can serve as retention hotspots for phosphorus (P) moving out of the urban environment. This retention may be reduced by P speciation that reduces the bioavailability of P to primary producers and alters its mobility in sediments. Here we examined the mobility and fate of dissolved P in urban stormwater ponds with a set of complementary field measurements and short‐term laboratory and field experiments. We measured the types and amount of P in water column and sediments of urban stormwater ponds. We further assessed the mobility of different P types in pond sediments in the field and rates of P release from sediment cores maintained under laboratory conditions. Finally, we assessed P uptake rates by pond algal communities using short‐term bioassay experiments. We found that dissolved organic P was highly prevalent in urban pond water and sediments and that this type of P was mobile within sediments and could be released under high or low O2 conditions. We also found highly variable P demand by algae among stormwater ponds and that algal growth responses to P was correlated to water column N:P ratios. Altogether, our results indicate an important role for organic phosphorus cycling in urban stormwater ponds, which likely constrains the overall retention efficiency in these aquatic ecosystems.

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Section: Discussionmentioning

confidence: 99%

Mobility and Bioavailability of Sediment Phosphorus in Urban Stormwater Ponds

Frost

Prater

Scott

et al. 2019

Water Resources Research

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“…Our 1‐kDa ultrafiltration experiments on grab samples from February 2017 support this assumption, with concentrations ranging from 2 to 10 μg L −1 Fe, while 0.45‐μm filters on the same grab samples resulted in Fe values between 50 and 100 μg L −1 . A previous study conducted in North Carolina also showed 1‐kDa Fe values less than 10 μg L −1 throughout the course of a year, over an order of magnitude lower than Fe concentrations in 0.45‐μm filtrate (River and Richardson, 2018b). …”

Section: Resultsmentioning

confidence: 74%

“…Clays are known to bind P due to sorption onto aluminum and iron oxides and are also known to exist in sizes less than 0.45 μm in watersheds across the world (Gibbs, 1977). Discrete P‐containing oxyhydroxide nanoparticles have also been shown to play a large role in P transport in some watersheds (Baken et al, 2016; River and Richardson, 2018b). Therefore, it is not surprising that nanoparticles such as those seen in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…This means that even if most of the suspended particles in a water sample do not pass through the filter, the smallest particles that do can still contain a large reactive P load. This could particularly be the case in clay‐rich watersheds, where small particles comprise a large percentage of the surface soils, or in watersheds with groundwater high in reduced Fe, which can promote the formation of iron oxyhydroxide nanoparticles (River and Richardson, 2018b). Additionally, no‐till farming practices without incorporation of fertilizer into the soil profile can cause vertical stratification of P in soils (Baker et al, 2017), which means that nanoparticles near the surface of the soil profile might be further enriched with P.…”

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confidence: 99%

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Dissolved Reactive Phosphorus Loads to Western Lake Erie: The Hidden Influence of Nanoparticles

River

Richardson

2019

J of Env Quality

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Increased dissolved reactive phosphorus (DRP) fluxes in the Maumee River in the Western Lake Erie watershed have been cited as a cause of recent hypoxia and toxic algal blooms in Western Lake Erie. Dissolved reactive P is operationally defined as the molybdate‐reactive P that passes through a 0.45‐μm filter. Unfortunately, this 0.45‐μm cutoff is not based on solute chemistry; rather, it is based on tradition dating back to the 1940s. This dissolved versus particulate operationally defined threshold may be limiting scientific understanding of the transport of reactive P in the Lake Erie watershed (and beyond). Naturally occurring nanoparticles smaller than 0.45 μm can pass through filters, inflating DRP values, as has been suggested by studies in other watersheds. Transmission electron microscopy of filtered samples from the Maumee River revealed nanoparticles of various mineralogy, which are rich in P. By analyzing public data, we estimate that approximately half of the DRP flux in the Maumee River is not truly dissolved orthophosphate; it is instead particulate P that has passed through 0.45‐μm filters. We also conducted a centrifugation experiment on previously filtered samples that likewise removed 40% of DRP and 75% of Fe. The influence of nanoparticles on DRP loads to Lake Erie has implications, including (i) helping to elucidate where reactive P originates on the landscape, (ii) designing best management practices, and (iii) improving our models of ecological response of nonpoint P loading. Core Ideas The role of nanoparticles in transporting P to Lake Erie is largely ignored. 0.45‐μm filtrate contained nanoparticles rich in P, inflating dissolved reactive P concentrations. Nanoparticles were responsible for approximately half of dissolved reactive P flux.

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“…We also relied on results from the Web of Science metaanalysis and research article synthesis when summarizing knowledge gaps related to microbial P forms and cycling mechanisms in agricultural water quality management research. We will not synthesize research on abiotic and biotic Fe and P interactions because these subjects have been thoroughly reviewed elsewhere (Chacon et al, 2006;Gerke, 2010;Lin et al, 2018;Martins et al, 2011;River & Richardson, 2018;Safarzadeh-Amiri et al, 2017;Saia et al, 2017;Wan et al, 2019;Wilfert et al, 2015;Wu et al, 2019) All data and analysis scripts associated with this publication are available on GitHub at <will fill in upon publication> and Zenodo (DOI: <will fill in upon publication>).…”

Section: Critical Review Objectives and Methodsmentioning

confidence: 99%

Critical Review of Polyphosphate and Polyphosphate Accumulating Organisms for Agricultural Water Quality Management

Saia¹,

Carrick²,

Buda³

et al. 2018

Preprint

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Despite ongoing management efforts, phosphorus (P) loading from agricultural landscapes continues to impair water quality. Wastewater treatment plant research has enhanced our knowledge of microbial mechanisms influencing P cycling, especially related to microbes known as polyphosphate accumulating organisms (PAOs) that store P as polyphosphate (polyP) under aerobic conditions and release P under anaerobic conditions. However, there is limited application of PAO research to reduce agricultural P loading and improve water quality. Herein, we conducted a meta-analysis to identifying articles in Web of Science on polyP and its use by PAOs. We grouped our meta-analysis by discipline—wastewater treatment, soils and sediments (terrestrial), freshwater, marine, and agriculture—and discussed whether PAO behavior in wastewater treatment plants can be extended to natural habitats, including agricultural settings like soils, undergoing alternating anaerobic/aerobic conditions. We also synthesized knowledge gaps and research opportunities. Terrestrial, freshwater, and marine disciplines had fewer polyP and PAO articles compared to wastewater treatment and there was limited article overlap between disciplines. There is an urgent need for interdisciplinary research linking PAOs, polyP, and oxygen availability with existing knowledge of P forms and cycling mechanisms in natural and agricultural environments to improve agricultural P management strategies and achieve water quality goals.

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Stream transport of iron and phosphorus by authigenic nanoparticles in the Southern Piedmont of the U.S.

Cited by 19 publications

References 42 publications

Mobility and Bioavailability of Sediment Phosphorus in Urban Stormwater Ponds

Mobility and Bioavailability of Sediment Phosphorus in Urban Stormwater Ponds

Dissolved Reactive Phosphorus Loads to Western Lake Erie: The Hidden Influence of Nanoparticles

Critical Review of Polyphosphate and Polyphosphate Accumulating Organisms for Agricultural Water Quality Management

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