Adsorption and desorption of phosphate on limestone in experiments simulating seawater intrusion

Price, René M.; Savabi, M. R.; Jolicoeur, Jean L.; Roy, Srikumar

doi:10.1016/j.apgeochem.2010.04.013

Cited by 52 publications

(31 citation statements)

References 24 publications

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“…Yet, in 14 years of water quality sampling, we observed repeated seasonal increases in water column TP within Taylor River that coincided with dry season increases in water column salinity. Price et al (2010) found that high-salinity groundwater intruding into a carbonate aquifer can mobilize carbonate-bound P from bedrock and possibly be an important source of P to the Everglades ecotone region when low surface water levels allow groundwater upwelling, such as during the southern Florida dry season. Our observations revealed that Taylor River groundwater remained saline (~30 psu) throughout our 2008-2009 sampling and that the high groundwater salinity was consistent with the extent of seawater intrusion in the Biscayne Aquifer in the region (Fitterman et al 1999;Price et al 2003Price et al , 2006.…”

Section: Source Of Phosphorus To Taylor Rivermentioning

confidence: 98%

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Hydrological Conditions Control P Loading and Aquatic Metabolism in an Oligotrophic, Subtropical Estuary

Koch

Childers

Stæhr

et al. 2011

Estuaries and Coasts

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Using high-resolution measures of aquatic ecosystem metabolism and water quality, we investigated the importance of hydrological inputs of phosphorus (P) on ecosystem dynamics in the oligotrophic, P-limited coastal Everglades. Due to low nutrient status and relatively large inputs of terrestrial organic matter, we hypothesized that the ponds in this region would be strongly net heterotrophic and that pond gross primary production (GPP) and respiration (R) would be the greatest during the "dry," euhaline estuarine season that coincides with increased P availability. Results indicated that metabolism rates were consistently associated with elevated upstream total phosphorus and salinity concentrations. Pulses in aquatic metabolism rates were coupled to the timing of P supply from groundwater upwelling as well as a potential suite of hydrobiogeochemical interactions. We provide evidence that freshwater discharge has observable impacts on aquatic ecosystem function in the oligotrophic estuaries of the Florida Everglades by controlling the availability of P to the ecosystem. Future water management decisions in South Florida must include the impact of changes in water delivery on downstream estuaries.

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Section: Source Of Phosphorus To Taylor Rivermentioning

confidence: 98%

“…In addition, saline water has been shown to release P bound to calcium carbonate (Price et al 2010). In Taylor River, the interannual oscillation from freshwater to hypersaline conditions could thus enable a corresponding pulse of P from estuarine sediments.…”

Section: Source Of Phosphorus To Taylor Rivermentioning

confidence: 99%

Hydrological Conditions Control P Loading and Aquatic Metabolism in an Oligotrophic, Subtropical Estuary

Koch

Childers

Stæhr

et al. 2011

Estuaries and Coasts

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“…The physicochemical reactions of P between overlying water and sediment in natural systems include adsorption/desorption and precipitation/dissolution reactions, which together, regulate soluble P concentrations in natural rivers, streams and estuaries (Wauchope and McDowell, 1984;Price et al, 2010). This phenomenon is known as the "phosphate buffer mechanism" (Richardson, 1985), which assumes that sediment, whether benthic or suspended, maintain dissolved reactive phosphate concentrations at some near-constant value regardless of biological removal and exogenic inputs (Froelich, 1988).…”

Section: Introductionmentioning

confidence: 99%

Phosphorus sorption and buffering mechanisms in suspended sediments from the Yangtze Estuary and Hangzhou Bay, China

Whelan

Wang

et al. 2013

Biogeosciences

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The adsorption isotherm and the mechanism of the buffering effect are important controls on phosphorus (P) behaviors in estuaries and are important for estimating phosphate concentrations in aquatic environments. In this paper, we derive phosphate adsorption isotherms in order to investigate sediment adsorption and buffering capacity for phosphorus discharged from sewage outfalls in the Yangtze Estuary and Hangzhou Bay near Shanghai, China. Experiments were also carried out at different temperatures in order to explore the buffering effects for phosphate. The results show that P sorption in sediments with low fine particle fractions was best described using exponential equations. Some P interactions between water and sediment may be caused by the precipitation of CaHPO₄ from Ca²⁺ and HPO₄²⁻ when the phosphate concentration in the liquid phase is high. Results from the buffering experiments suggest that the Zero Equilibrium Phosphate Concentrations (EPC₀) vary from 0.014 mg L⁻¹ to 0.061 mg L⁻¹, which are consistent with measured phosphate concentrations in water samples collected at the same time as sediment sampling. Values of EPC₀ and linear sorption coefficients (K) in sediments with high fine particle and organic matter contents are relatively high, which implies that they have high buffering capacity. Both EPC₀ and K increase with increasing temperature, indicating a higher P buffering capacity at high temperatures

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“…TP concentrations in the coastal sites of southern Taylor Slough vary seasonally along with the ionic concentrations. Brackish groundwater in the EMER region of Taylor Slough has been found to have elevated concentrations of TP as a result water-rock interactions (Price et al, , 2010. Furthermore the discharge of the TP-laden brackish groundwater was found to increase TP and ecosystem metabolism in surface water of estuarine ponds in southern Taylor Slough (Koch et al, 2012).…”

Section: Water Chemistry and Flushing Timesmentioning

confidence: 98%

Long-term (11 years) study of water balance, flushing times and water chemistry of a coastal wetland undergoing restoration, Everglades, Florida, USA

Sandoval

Price

Whitman

et al. 2016

CATENA

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Adsorption and desorption of phosphate on limestone in experiments simulating seawater intrusion

Cited by 52 publications

References 24 publications

Hydrological Conditions Control P Loading and Aquatic Metabolism in an Oligotrophic, Subtropical Estuary

Hydrological Conditions Control P Loading and Aquatic Metabolism in an Oligotrophic, Subtropical Estuary

Phosphorus sorption and buffering mechanisms in suspended sediments from the Yangtze Estuary and Hangzhou Bay, China

Long-term (11 years) study of water balance, flushing times and water chemistry of a coastal wetland undergoing restoration, Everglades, Florida, USA

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