Seasonal variations, potential bioavailability, and ecological risk of phosphorus species in the coastal sediments of the Makran

2021 ◽  
Vol 173 ◽  
pp. 113125
Author(s):  
Kamalodin Kor ◽  
Hamid Ershadifar ◽  
Amir Ghazilou ◽  
Emad Koochaknejad
Keyword(s):  
Ecological Risk ◽  
Seasonal Variations ◽  
Coastal Sediments ◽  
Phosphorus Species

scholarly journals Seasonal Variations of Phosphorus Species in the Overlying and Pore Waters of the Tuohe River, China

2019 ◽  
Vol 2019 ◽  
pp. 1-9
Author(s):  
Qing Xu ◽  
Xiaoping Yu ◽  
Yafei Guo ◽  
Tianlong Deng ◽  
Yu-Wei Chen ◽  
...  
Keyword(s):  
Seasonal Variations ◽  
Yangtze River ◽  
Algal Bloom ◽  
Soluble Reactive Phosphorus ◽  
Pore Waters ◽  
Phosphorus Species ◽  
Dissolved Phosphorus ◽  
Vertical Distributions ◽  
Reactive Phosphorus ◽  
Main Factor

Overlying sediment and pore waters were collected in summer and winter at upstream (Jintang) and downstream (Neijiang) sites of the Tuohe River, which is one of the five largest tributaries of the Yangtze River in China. Phosphorus species, including soluble reactive phosphorus (SRP), soluble unreactive phosphorus (SUP), and total dissolved phosphorus (TDP), and some diagenetic constituents including dissolved Fe(II), Mn(II), and sulfide in overlying and pore waters, were measured systematically. The seasonal variations and vertical distributions of phosphorus species in overlying and pore waters at both sampling sites were obtained to elucidate some aspects of the transport and transformations of phosphorus. Based on the profiles of pore and overlying waters as well as the TDN/TDP data during an algal bloom in 2007, it was clearly demonstrated that phosphorus was the main factor limiting the phytoplankton growth in the Tuohe River.

Seasonal variations of phosphorus species in sediment from the middle Adriatic Sea

2009 ◽  
Vol 59 (4) ◽  
pp. 853-866 ◽  
Author(s):  
Slavica Matijević ◽  
Natalia Bojanić ◽  
Grozdan Kušpilić ◽  
Živana Ninčević Gladan
Keyword(s):  
Seasonal Variations ◽  
Adriatic Sea ◽  
Phosphorus Species

Distribution, sources and ecological risk of polycyclic aromatic hydrocarbons in the estuarine–coastal sediments in the East China Sea

2017 ◽  
Vol 19 (4) ◽  
pp. 561-569 ◽  
Author(s):  
Ye Li ◽  
Xinran Liu ◽  
Min Liu ◽  
Xiaofei Li ◽  
Qing Wang ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
East China Sea ◽  
Ecological Risk ◽  
Aromatic Hydrocarbons ◽  
Coastal Area ◽  
Coastal Sediments ◽  
East China ◽  
The East China Sea ◽  
Polycyclic Aromatic ◽  
Estuarine Coastal

Pollution by PAHs in the estuarine–coastal area of the ECS should be paid attention.

scholarly journals Authigenic apatite and octacalcium phosphate formation due to adsorption–precipitation switching across estuarine salinity gradients

2015 ◽  
Vol 12 (3) ◽  
pp. 723-738 ◽  
Author(s):  
J. F. Oxmann ◽  
L. Schwendenmann
Keyword(s):  
Octacalcium Phosphate ◽  
Coastal Sediments ◽  
Coastal Zones ◽  
Phosphorus Species ◽  
Inorganic P ◽  
Salinity Gradients ◽  
P Accumulation ◽  
Carbonate Fluorapatite ◽  
Load Effects ◽  
Sediment Ph

Abstract. Mechanisms governing phosphorus (P) speciation in coastal sediments remain largely unknown due to the diversity of coastal environments and poor analytical specificity for P phases. We investigated P speciation across salinity gradients comprising diverse ecosystems in a P-enriched estuary. To determine P load effects on P speciation we compared the high P site with a low P site. Octacalcium phosphate (OCP), authigenic apatite (carbonate fluorapatite, CFAP) and detrital apatite (fluorapatite) were quantitated in addition to Al/Fe-bound P (Al/Fe-P) and Ca-bound P (Ca-P). Gradients in sediment pH strongly affected P fractions across ecosystems and independent of the site-specific total P status. We found a pronounced switch from adsorbed Al/Fe-P to mineral Ca-P with decreasing acidity from land to sea. This switch occurred at near-neutral sediment pH and has possibly been enhanced by redox-driven phosphate desorption from iron oxyhydroxides. The seaward decline in Al/Fe-P was counterbalanced by the precipitation of Ca-P. Correspondingly, two location-dependent accumulation mechanisms occurred at the high P site due to the switch, leading to elevated Al/Fe-P at pH < 6.6 (landward; adsorption) and elevated Ca-P at pH > 6.6 (seaward; precipitation). Enhanced Ca-P precipitation by increased P loads was also evident from disproportional accumulation of metastable Ca-P (Ca-Pmeta) at the high P site. Here, sediments contained on average 6-fold higher Ca-Pmeta levels compared with the low P site, although these sediments contained only 2-fold more total Ca-P than the low P sediments. Phosphorus species distributions indicated that these elevated Ca-Pmeta levels resulted from transformation of fertilizer-derived Al/Fe-P to OCP and CFAP in nearshore areas. Formation of CFAP as well as its precursor, OCP, results in P retention in coastal zones and can thus lead to substantial inorganic P accumulation in response to anthropogenic P input.

scholarly journals Comparative Study on the Elucidation of Sedimentary Phosphorus Species Using Two Methods, the SMT and SEDEX Methods

2020 ◽  
Vol 2020 ◽  
pp. 1-8 ◽  
Author(s):  
Pei Sun Loh ◽  
Chen-Yu Ying ◽  
Hussien Ibrahim Mohammed Alnoor ◽  
Xing-Rui Huang ◽  
Zhang-Hua Lou ◽  
...  
Keyword(s):  
Salt Marsh ◽  
Changjiang Estuary ◽  
Coastal Sediments ◽  
Hangzhou Bay ◽  
Phosphorus Species ◽  
The Changjiang Estuary ◽  
Inorganic P ◽  
Extractable P ◽  
The Mean ◽  
P Sources

Sedimentary phosphorus (P) forms are important representatives of P sources and their bioavailability as well as the potential of sediments to release P in water. In this study, surface sediments along a transect of the Changjiang Estuary and two transects along the Andong salt marsh in the southwest of Hangzhou Bay were subjected to the elucidation of sedimentary P species using the standards, measurements, and testing (SMT) and sequential extraction (SEDEX) methods. The results showed that the mean sedimentary P forms elucidated by the SMT method were as follows: organic P (OP; ∼11–14 mg/kg; ∼30–45% of total P; TP) > apatite P (∼5–15 mg/kg; ∼21–36% TP) > Fe/Al-P (∼8–14 mg/kg; ∼31–34% TP), with inorganic P (IP) composing 54–70% of TP. The mean sedimentary P forms elucidated by the SEDEX method were as follows: authigenic P (∼54–68 mg/kg; ∼41–46% TP) > extractable P (Ex-P; ∼36–53 mg/kg; ∼28–34%) > Fe-P (∼21–27 mg/kg; ∼13–19%) > OP (∼8.7–13 mg/kg; ∼5–8%) > detrital P (De-P; ∼2 mg/kg; ∼1–2% TP), with IP composed of ∼91–94% TP. These results showed that the SEDEX method elucidated higher concentrations of sedimentary P forms as well as the TP from these coastal sediments although the SMT method had the advantage of being more economic and faster. The results of both the SMT and SEDEX methods showed that the Andong salt marsh and Changjiang Estuary sediments had much bioavailable P. The mean percentages of bioavailable P from the SMT and SEDEX methods were ∼64–74% and 52–56% of TP, respectively, indicating that these sediments were prone to release P to the coastal areas.

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