Relative Importance of Solid-Phase Phosphorus and Iron on the Sorption Behavior of Sediments

Zhang, Jiazhong; Huang, Xiaolan

doi:10.1021/es061836q

Cited by 109 publications

(77 citation statements)

References 27 publications

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“…An adsorption K value was calculated as the slope of the linear section of the adsorption isotherm where EPC approaches EPC 0 . Similar to Zhang and Huang (2007), we defined exchangeable inorganic P (P exch ) as the phosphate released into the 0.01 M CaCl 2 solution when no phosphate was added. Sediment samples were digested with HNO 3 and HCl, and digestates were analyzed for total iron (Fe), aluminum (Al), magnesium (Mg), and calcium (Ca), using inductively coupled plasma-optical emission spectroscopy (APHA 1992).…”

Section: Sedimentmentioning

confidence: 99%

Characteristics and Influence of Phosphorus Accumulated in the Bed Sediments of a Stream Located in an Agricultural Watershed

et al. 2008

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We investigated the accumulation and influence of bioavailable P (BAP) in sediments of a stream located in an agricultural area of the Lake Mendota watershed in Wisconsin, USA. During hydrologic events, the stream carried high concentrations of suspended sediment (up to 250 mg/l) and BAP (up to 2.5 mg/l). Bed sediments were highly enriched in BAP, as inventories of BAP in the top 10 cm of sediment ranged from 143 to 14,500 lg P/cm 2 . Space variations in BAP inventories were related to site-specific hydrodynamics and geochemical factors, including iron (Fe; r 2 = 0.71) and aluminum (Al; r 2 = 0.54) concentrations. Most sites behaved as potential sinks for dissolved reactive phosphate during hydrologic events and potential sources during base-flow periods. Through the combination of site-specific factors and geochemical controls, Dorn Creek modifies the amount, timing, and composition of P delivered from the watershed to downstream sites and water bodies.

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Section: Sedimentmentioning

confidence: 99%

Characteristics and Influence of Phosphorus Accumulated in the Bed Sediments of a Stream Located in an Agricultural Watershed

et al. 2008

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“…There were no significant relationships between P fractions and Al, Fe, Mn and Ca contents. Though Fe and Al may contribute significantly to phosphorus bioavailability in soils by enhancing the cation-exchange capacity and reducing the phosphorus fixation (Zhang and Huang, 2007;Dunne et al, 2013). The TP, IP, HCl-P, and NaOH-P contents were no significantly correlated with SOM, except OP contents.…”

Section: Tpmentioning

confidence: 94%

Phosphorus distribution and sorption-release characteristics of the soil from newly submerged areas in the Danjiangkou reservoir, China

Song

Shan

Zou

et al. 2017

Ecological Engineering

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a b s t r a c tThe phosphorus (P) distribution and sorption-release characteristics of the surface soil in new submerged areas from the Danjiangkou Reservoir were investigated, and assessed the potential risk of P released from the soils. The results indicated that the TP (total phosphorus) contents in the soils varied from 161.01 mg/kg to 1150.94 mg/kg, and the mean content value of TP was the highest in arable land (732.91 mg/kg), especially distributed in arable land above 160 m elevation; Calcium bound phosphorus (HCl-P) was the major fraction of TP, the proportion was ranged from 60.77% to 83.38% for different land using types; the highest proportion of OP (organic phosphorus) was 32.07% in grass land soils. For all the samples, the rank order P-fractions was HCl-P > OP > NaOH-P (Phosphorus bound to Al and Fe oxides). Besides, the contents of TP correlated significantly with the HCl-P contents, (r = 0.936, P < 0.01), NaOH-P contents (r = 0.661, P < 0.01), OP contents (r = 0.762, P < 0.01), and IP contents (r = 0.970, P < 0.01), but OP contents was no significantly correlated with HCl-P, NaOH-P contents. The sorption capacity of soil ranged from 578.79 to 1457.44 mg/kg, and the amount of P released from the soils were ranged from 0.635 to 5.957 mg/kg; however, due to the concentration of P in the overlying water, about 80% of the newly submerged area would act as sink of P.

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“…In particular, the particle size, mineralogy and the concentration of exchangeable phosphate already sorbed onto the sediment surface are key factors which influence the speciation of P in the sediment, as well as the potential for SRP exchange across the sediment-water interface (Stone et al 1995;Zhang and Huang 2007).…”

Section: Responsible Editor: Marcel Van Der Perkmentioning

confidence: 99%

Riverbed sediments buffer phosphorus concentrations downstream of sewage treatment works across the River Wensum catchment, UK

Roberts

Cooper

2018

J Soils Sediments

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Purpose Wastewater effluent discharged into rivers from sewage treatment works (STWs) represents one of the most important point sources of soluble reactive phosphorus (SRP) pollution and is a major driver of freshwater eutrophication. In this study, we assess the ability of riverbed sediments to act as a self-regulating buffering system to reduce SRP dissolved in the water column downstream of STW outflows. Materials and methods River water and riverbed sediment samples were collected from ten tributary outlets across the River Wensum catchment, Norfolk, UK, at monthly intervals between July and October 2016, such that 40 sediment and 40 water samples were collected in total. Of these locations, five were located downstream of STWs and five were on tributaries without STWs. Dissolved SRP concentrations were analysed, and the equilibrium phosphorus concentration (EPC 0 ) of each sediment sample was measured to determine whether riverbed sediments were acting as net sources or sinks of SRP. Results and discussion The mean SRP concentration downstream of STWs (382 μg P L −1 ) was double that of sites without a STW (185 μg P L −1 ), whilst the mean EPC 0 for effluent impacted sites (105 μg P L −1 ) was 70% higher than that recorded at unaffected sites (62 μg P L −1 ). Regardless of STW influence, riverbed sediments across all ten sites almost always acted as net sinks for SRP from the overlying water column. This was particularly true at sites downstream of STWs which displayed enhanced potential to buffer the river against increases in SRP released in sewage effluent. Conclusions Despite EPC 0 values revealing riverbed sediments were consistently acting as sinks for SRP, elevated SRP concentrations downstream of STWs clearly demonstrate the sediments have insufficient SRP sorption capacity to completely buffer the river against effluent discharge. Consequently, SRP concentrations across the catchment continue to exceed recommended standards for good chemical status, thus emphasising the need for enhanced mitigation efforts at STWs to minimise riverine phosphorus loading.

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Relative Importance of Solid-Phase Phosphorus and Iron on the Sorption Behavior of Sediments

Cited by 109 publications

References 27 publications

Characteristics and Influence of Phosphorus Accumulated in the Bed Sediments of a Stream Located in an Agricultural Watershed

Characteristics and Influence of Phosphorus Accumulated in the Bed Sediments of a Stream Located in an Agricultural Watershed

Phosphorus distribution and sorption-release characteristics of the soil from newly submerged areas in the Danjiangkou reservoir, China

Riverbed sediments buffer phosphorus concentrations downstream of sewage treatment works across the River Wensum catchment, UK

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