Spatial distribution of phosphorus speciation in marsh sediments along a hydrologic gradient in a subtropical estuarine wetland, China

Zhang, Wenlong; Zeng, Chen; Tong, Chuan; Zhai, Shuijing; Lin, Xianbiao; Gao, Dengzhou

doi:10.1016/j.ecss.2014.12.023

Cited by 42 publications

(33 citation statements)

References 40 publications

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“…The spatial distribution of P in sediments is shown in Figure 3 with ArcGIS, which shows an increasing trend from the entrance to the dam site, and that is consistent with the literature results [13]. This trend is in accordance with the hydraulic gradient, which contributes to sediment deposits [24,26]. The dam site (point 10) had the second highest content of sediment P, which reached 750.5 mg/kg.…”

Section: Distribution and Fractions Of Sediments P In Biliuhe Reservoirsupporting

confidence: 77%

Spatial Distribution, Adsorption/Release Characteristics, and Environment Influence of Phosphorus on Sediment in Reservoir

Wang

Liu

et al. 2017

Water

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Sediment gradually accumulates at the bottom of reservoirs after decades of running. To explore the influences of sediments on the water quality of reservoirs, the spatial distribution, adsorption/release characteristics, and environment influence of sediment pollutants should be analyzed. In this paper, the spatial distributions of phosphorus (P) and P fractions in the Biliuhe reservoir (river valley reservoirs) sediments were investigated. The adsorption and release characteristics of sediments P were studied in the experiment, while its environmental influence was analyzed too. The results indicate that the concentration of P in sediments was higher at the dam and the Zhongling site, while lower at other entrances of the reservoir and the smallest in the water-level fluctuating zone. Total Phosphorus (TP) varied from 355.46 to 764.57 mg/kg. Inorganic Phosphorus (IP) was the main form of TP in sediments, making up a proportion of 56-75%, while the correlation coefficient of P bound to Al, Fe, and Mn oxides was 0.922. Hydroxide (Fe/Al-P) was the main form of IP, which accounted for 46-83% with a correlation coefficient of 0.888. The maximum adsorption capacity calculated by Langmuir model was between 714.29 and 3333.33 mg/kg. The adsorption efficiency obtained by the Freundlich model was within the range of 0.40-1.42, which indicated that P adsorption was more difficult in the water-level fluctuating zone. The critical adsorption and release concentration range was 0.1-0.2 mg/L for the majority of the sampling points. The amount of P released in 24 h (the initial concentration of TP in the overlying water was 0 mg/L) accounted for 1.15-4.16% of TP in sediments, which was higher than the average concentration in the reservoir. It is concluded that the sediment is the potential pollution source. The relationship between the change of environmental factors and the release of sediment contaminants should be considered in the future.

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Section: Distribution and Fractions Of Sediments P In Biliuhe Reservoirsupporting

confidence: 77%

Spatial Distribution, Adsorption/Release Characteristics, and Environment Influence of Phosphorus on Sediment in Reservoir

Wang

Liu

et al. 2017

Water

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“…Meanwhile, sediment water content, bulk density, TC, TN, Fe 2+ , Fe 2+ /Fe 3+ , and clay were significantly related to P species (Table ). Previous studies have shown that sediment particle size has significant influence on P species, and clay has a large surface area and P adsorption ability . In this study, relatively higher proportion of clay particles was observed in reclamation culture ponds, which accelerate the P adsorption capacity of sediment, and thus increase the concentration of various P species.…”

Section: Discussionmentioning

confidence: 49%

“…The Shanyutan wetland in Min River estuary is located in the Southeastern China (26°00′36″–26°03′42″N, 119°34′12″–119°41′40″E, Figure ) and covers an area of about 31.2 km 2 . The study area is situated in a typically subtropical monsoon climate with an annual temperature of 19.6 °C and precipitation 1350 mm, respectively . In this study, the sediment samples from three wetlands including the natural marsh wetland (A), 3‐year and 15‐year reclamation culture ponds were collected by means of 30 cm long Plexiglas tube (7 cm in diameter) that was inserted into a surface‐operated coring device (Core‐60, Austria) equipped with a core cylinder and a one‐way check valve to preserve the sediment integrity in November 2014 (Figure ) .…”

Section: Methodsmentioning

confidence: 99%

“…Sediment water content and bulk density were measured by oven drying method and cutting ring method, respectively . The sediment pH and electrical conductivity (EC) were measured with a pH meter and 2265FS EC meter (Spectrum Technologies, USA), respectively . Sediment TN was determined using an elemental analyzer (Vario EL CN Elemental Analyzer, Elementar, Germany), and sediment after acidification with 1 M HCl was analyzed for TOC .…”

Section: Methodsmentioning

confidence: 99%

“…In recent years, considerable efforts have been made to measure the sediment P species in coastal and lakes wetlands, and these results have revealed that the aquatic ecosystems have a potential eutrophication risk due to higher sediment P loading . Among the sediment P species, loosely adsorbed P (Lsor‐P) and part of organic P (Org‐P) are easily desorbed and released from sediment to the overlying water, and iron and aluminum‐bound P (Fe/Al‐P) is also released easily in the suboxic environment, while calcium‐bound P (Ca‐P) is relatively stable .…”

Section: Introductionmentioning

confidence: 99%

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Reclamation Culture Alters Sediment Phosphorus Speciation and Ecological Risk in Coastal Zone of Southeastern China

Gao

Chen

et al. 2018

CLEAN Soil Air Water

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Sediment phosphorus (P) speciation plays a critical role in coastal wetland ecosystems, while the response of P speciation to reclamation culture remains unclear. In this study, sediment P species (total P [TP], organic P [Org‐P], inorganic P [IP], iron‐ and aluminum‐bound P [Fe/Al‐P], calcium‐bound P [Ca‐P], loosely adsorbed P [Lsor‐P], P sorption index [PSI], and P adsorption saturation [DPS] are investigated in the natural marsh wetland, 3‐year and 15‐year reclamation culture ponds. Sediment P pollution level and eutrophication risk are evaluated based on the single‐factor standard index (Si) and eutrophication risk index (ERI). Furthermore, a simulation experiment is conducted to reveal the effects of baits input and overlying water aeration on sediment P species and ecological risk. Measured sediment TP, Org‐P, IP, Fe/Al‐P, Ca‐P, and Lsor‐P concentrations are significantly higher in 15‐year culture ponds than in 3‐year culture ponds and natural marsh wetland. Sediment PSI is lower in reclamation culture ponds than in natural marsh wetland, while DPS is just opposite. The Si and ERI are higher in 15‐year culture ponds than in natural marsh wetland, suggesting that reclamation culture significantly increases sediment P pollution level and eutrophication risk. A short‐term simulation experiment further indicates that baits input and overlying water aeration can alter sediment P dynamics and increase sediment P loading. Overall, these results confirm that reclamation culture can make more available P accumulation and thus increase eutrophication risk of adjacent coastal water.

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Phytoremediation of soil co‐contaminated with uranium and chromium by sunflower (Helianthus annuus L.) enhanced with slow‐release composite chelating agent (EDTA/ammonium citrate)

Lin,

Wang,

Zhou

et al. 2024

J of Chemical Tech & Biotech

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BACKGROUNDSoil in uranium mining areas is contaminated by uranium and associated heavy metals, posing a significant threat to human health and ecological security. Chelating agent assisted phytoremediation is a cost‐effective and ecologically friendly remediation approach for uranium and associated heavy metals contaminated soil. In this work, a novel slow‐release composite chelating agent (SRCMC‐g‐CMCD‐EDTA/AC) was fabricated using carboxymethyl chitosan‐graft‐carboxymethyl‐β‐cyclodextrin (CMC‐g‐CMCD) as a slow‐release carrier and EDTA/ammonium citrate (AC) as a composite chelating agent through the spray drying method, which was used for phytoremediation of soil co‐contaminated with uranium and chromium.RESULTSCMC‐g‐CMCD exhibited superior slow‐release performance for both EDTA and AC in comparison with CMC and CMCD. When applied to soil contaminated with uranium (U) and chromium (Cr), SRCMC‐g‐CMCD‐EDTA/AC effectively regulated the release of U and Cr. Sunflowers (Helianthus annuus L.) grown in treated soil showed a significant increase in U and Cr uptake by 70.55% and 35.55%, respectively, and reduced leaching losses by 34.88% and 37.42%.CONCLUSIONSRCMC‐g‐CMCD‐EDTA/AC not only assists in the phytoremediation of soil co‐contaminated with U and Cr but also reduces the risk of leaching into groundwater during the soil phytoremediation process. SRCMC‐g‐CMCD‐EDTA/AC‐assisted phytoremediation technology was an effective and environmentally friendly remediation means for the removal of U and heavy metals from contaminated soils in uranium mining areas. © 2024 Society of Chemical Industry (SCI).

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Spatial distribution of phosphorus speciation in marsh sediments along a hydrologic gradient in a subtropical estuarine wetland, China

Cited by 42 publications

References 40 publications

Spatial Distribution, Adsorption/Release Characteristics, and Environment Influence of Phosphorus on Sediment in Reservoir

Spatial Distribution, Adsorption/Release Characteristics, and Environment Influence of Phosphorus on Sediment in Reservoir

Reclamation Culture Alters Sediment Phosphorus Speciation and Ecological Risk in Coastal Zone of Southeastern China

Phytoremediation of soil co‐contaminated with uranium and chromium by sunflower (Helianthus annuus L.) enhanced with slow‐release composite chelating agent (EDTA/ammonium citrate)

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