Phosphorus speciation and availability in sediments off the eastern coast of Hainan Island, South China Sea

Yang, Bin; Liu, Sumei; Wu, Ying; Zhang, Jing

doi:10.1016/j.csr.2016.03.003

Cited by 56 publications

(44 citation statements)

References 107 publications

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“…Sequential extraction and measurement of P fractions. To extract the P fractions, a sequential extraction was performed in triplicate with 0.5 g freezedried sediment samples in 50 ml centrifuge tubes using a sequential extraction method (SEDEX) modified from Ruttenberg (1992) and Yang et al (2016) (Fig. 1).…”

Section: Laboratory Analysismentioning

confidence: 99%

“…1). This method analyzes the most commonly known sedimental P fractions: Ex-P, NaOH-P, HCl-P, BD-P, De-P, and Org-P. During the extraction process, modifications were made following Yang et al (2016) to reduce interference from the citratedithionite-bicarbonate (CDB) reagent with the SEDEX process. Fig.…”

Section: Laboratory Analysismentioning

confidence: 99%

“…TP was calculated as the sum of Inorg-P and Org-P (Slomp et al 1996). To avoid underestimation of Org-P concentration (Ruttenberg 1992), a separate extraction procedure was applied (Yang et al 2016). In addition, other vital conditions for the extracts were maintained (Zhang et al 2010, Lin et al 2013, and all samples were analyzed in triplicate after filtration (GF/F, Whatman, 0.45 µm).…”

Section: Laboratory Analysismentioning

confidence: 99%

“…The OM contents of the sediment samples were determined by igniting a dry 0.2 g sediment sample for 4 h at 550°C (mass loss on ignition, LOI; White & Reddy 1999). Ruttenberg (1992) and Yang et al (2016)…”

Section: Laboratory Analysismentioning

confidence: 99%

“…Various studies on the distribution of sedimentary P fractions in both marine and freshwater sediments have been performed (e.g. Huo et al 2011, Meng et al 2014, Yang et al 2016, Cao et al 2019; however, understanding the vertical distribution of benthic P fractions in aquaculture wastewater treatment systems is important for improving the nutrient cy cling and optimization of the system. This study aimed to quantify the contents of the major P fractions in clam-bioturbated pond sediment and to investigate the influence of T. granosa's ecological activity on the distribution and bioavailability of P fractions in an ecological aquaculture wastewater treatment system.…”

Section: Introductionmentioning

confidence: 99%

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Nutrient cycling in ecological aquaculture wastewater treatment systems: vertical distribution of benthic phosphorus fractions due to bioturbation activity by Tegillarca granosa

Nicholaus¹,

Lukwambe²,

Lai³

et al. 2019

Aquacult. Environ. Interact.

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Fractionation of sediment phosphorus (P) was conducted to examine the distribution and bioavailability of P fractions in a blood clam Tegillarca granosa-based ecological aquaculture wastewater treatment system. In a laboratory experiment, either a low or high density of clams, or no clams (control), were added to a polypropylene chamber containing aquaculture wastewater and an 8 cm sediment layer. Distribution and bioavailability of inorganic P (Inorg-P) -which included exchangeable P (Ex-P), metal oxide-bound P (NaOH-P), calcium-bound P (HCl-P), redoxsensitive P (BD-P), and detrital P (De-P) -and organic P (Org-P) in the sediment were investigated after 30 d using a sequential extraction procedure (SEDEX). Results showed that T. granosa bioturbation activities markedly changed the contents of P fractions, especially Ex-P, NaOH-P, BD-P, and Org-P (p < 0.05). Total Inorg-P varied from 1.83 to 6.75 µmol g −1 , with an average of 4.29 ± 1.37 µmol g −1 among the 3 groups. Org-P ranged from 5.01 to 9.76 µmol g −1 and accounted for 22 to 41% of total P (TP). Despite some variation in contents at different depths, the average proportions of P fractions to TP were, in ascending order, Ex-P, BD-P, NaOH-P, HCl-P, De-P, and Org-P. Inorg-P had the highest proportions (73.83%) of TP. Bioavailable P (Ex-P, NaOH-P, and BD-P) proportions were 61, 58.23, and 44.44%, respectively, relative to the control. The variant contents of the P fractions were most probably due to enhanced organic matter consumption and mineralization, metal oxide dissolutions, and the increased bioavailable P in the bioturbated sediment. This study suggests that T. granosa can modify the concentrations, distribution, and bioavailability of sedimentary P, as well as reduce Org-P. Our study further advances the knowledge on P cycling and provides theoretical assistance for monitoring P in aquatic environments.

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Section: Laboratory Analysismentioning

confidence: 99%

Section: Laboratory Analysismentioning

confidence: 99%

Section: Laboratory Analysismentioning

confidence: 99%

Section: Laboratory Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Nutrient cycling in ecological aquaculture wastewater treatment systems: vertical distribution of benthic phosphorus fractions due to bioturbation activity by Tegillarca granosa

Nicholaus¹,

Lukwambe²,

Lai³

et al. 2019

Aquacult. Environ. Interact.

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Aging of anhydride‐hardened epoxies in lubricants at elevated temperatures

Reuscher

Haag

Patzelt

et al. 2017

J of Applied Polymer Sci

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In automotive under-the-hood applications, electronics respectively their packaging materials come in contact with automotive fluids. The effect of automatic transmission fluid (ATF) on an anhydride-cured epoxy was investigated at temperatures up to 180 8C for up to 1000 h. This study has shown that ATF retards the oxidative aging of the epoxy, presumably due to oxygen consumption. Where as in air the material underwent a thermo-oxidative aging with a mass loss of up to 4% and a strong broadening of Tg to higher temperatures, in ATF a temperature dependent distinctive drop of Tg from 142 8C to 126 8C after 1000 h aging at 180 8C, and a mass loss of maximum 1% was observed which might be a thermal decomposition of the epoxy material. A slight broadening of the damping factors might indicate an intrusion of ATF components. A color change of the samples could be observed after aging in air and ATF, with the discoloration in air being more intense. An explanation for the color change might be either a minor amount of oxygen causing an oxidative discoloration reaction or the intrusion of colored ATF degradation products. While the oxidation-kinetics in air exhibited Arrhenius temperature-dependence the mechanism in ATF changed above 165 8C. An acceleration of aging tests at temperatures beyond 150 8C is therefore not possible

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Flexural fatigue behavior of a pultruded basalt fiber reinforced epoxy plate subjected to elevated temperatures exposure

Wang

Yang

et al. 2016

Polymer Composites

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In the present article, effects of elevated temperature treatment on the flexural fatigue behavior of a pultruded basalt fiber reinforced epoxy plates (BFRPs) were investigated. Elevated temperature treatment conditions were set as 150 and 2508C for 0.5, 1, and 2 h in an oven. The static testing results revealed that elevated temperature treatment only brings in slight degradation in the flexural properties of the BFRP. However, the short beam shear strength (SBS) was deteriorated significantly. Dynamic mechanical thermal analysis (DMTA) results indicates that elevated temperature treatment at 1508C mainly shows a post-curing effect on the resin matrix, while elevated temperature treatment at 2508C leads to fiber debonding and decomposition of the resin. The S-N curves of BFRP (untreated and treated 150 and 2508C for 1 h) show that the elevated temperature treatment decreased the fatigue lives of BFRP remarkably, especially under high strain ratio. As indicated, elevated temperature treatment accelerates the growth of the damages due, mainly, to the deteriorated fiber-resin bonding property and increased void content. POLYM. COMPOS., 39:1731-1741

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Phosphorus speciation and availability in sediments off the eastern coast of Hainan Island, South China Sea

Cited by 56 publications

References 107 publications

Nutrient cycling in ecological aquaculture wastewater treatment systems: vertical distribution of benthic phosphorus fractions due to bioturbation activity by Tegillarca granosa

Nutrient cycling in ecological aquaculture wastewater treatment systems: vertical distribution of benthic phosphorus fractions due to bioturbation activity by Tegillarca granosa

Aging of anhydride‐hardened epoxies in lubricants at elevated temperatures

Flexural fatigue behavior of a pultruded basalt fiber reinforced epoxy plate subjected to elevated temperatures exposure

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