Bioavailability and geochemical speciation of phosphorus in surface sediments of the Southern Caspian Sea

Kazem Darvish Bastami; Mahmoud Reza Neyestani; Hadi Raeisi; Elnaz Shafeian; Mehrnaz Baniamam; Ali Shirzadi; Marjan Esmaeilzadeh; Shahla Mozaffari; Behnia Shahrokhi

doi:10.1016/j.marpolbul.2017.10.095

Bioavailability and geochemical speciation of phosphorus in surface sediments of the Southern Caspian Sea

Mar Pollut Bull. 2018 Jan:126:51-57. doi: 10.1016/j.marpolbul.2017.10.095. Epub 2017 Nov 4.

Authors

Kazem Darvish Bastami¹, Mahmoud Reza Neyestani², Hadi Raeisi³, Elnaz Shafeian⁴, Mehrnaz Baniamam⁴, Ali Shirzadi⁵, Marjan Esmaeilzadeh⁶, Shahla Mozaffari⁷, Behnia Shahrokhi⁸

Affiliations

¹ Iranian National Institute for Oceanography and Atmospheric Science (INIOAS), No. 3, Etemadzadeh St., Fatemi Ave., 1411813389 Tehran, Iran. Electronic address: darvish.bastami@inio.ac.ir.
² Department of Chemistry, Faculty of Science, University of Zanjan, Postal Code 45371-38791 Zanjan, Iran; Novin Shimyar Chemical Laboratory, P.O. Box 14589-3699, Tehran, Iran.
³ Department of Fisheries, Faculty of Agriculture and Natural Resources, Gonbad Kavoos University, Gonbad Kavoos, Iran.
⁴ Department of Marine Science and Technology, Science and Research Branch, Islamic Azad University, Tehran, Iran.
⁵ Novin Shimyar Chemical Laboratory, P.O. Box 14589-3699, Tehran, Iran.
⁶ Department of Environmental Science, Faculty of Environment and Energy, Science and Research Branch, Islamic Azad University, Tehran, Iran.
⁷ Department of Chemistry, Payame Noor University, P.O. Box 19395-3697, Tehran, Iran.
⁸ Chemical Engineering Department, Faculty of Engineering, Shomal University, PO Box 731, Amol, Mazandaran, Iran.

PMID: 29421132
DOI: 10.1016/j.marpolbul.2017.10.095

Abstract

The purpose of this study was to quantify phosphorus bioavailability and various forms of this element in surface sediments of the southern Caspian Sea. To do, sediment samples were collected from different depths in autumn 2015 using a Van Veen Grab. Phosphorus forms were recognized by a sequential extraction procedure (SEDEX). Results revealed that the range of total phosphorus (TP) was between 431ppm and 594ppm with a mean value of 535.25±45.05ppm. Organic phosphorus (OP) ranged from 62 to 99ppm and contributed 14.85±2.21% of total phosphorus in average. The contents of loosely phosphorus, iron-bound phosphorus, authigenic phosphorus and detrital phosphorus varied 35-55ppm, 50-94ppm, 125-189ppm and 152-217ppm, respectively. Generally, inorganic phosphorus (IP) was between 365 and 522ppm which comprised 81.9-88.53% of total phosphorus. Findings showed levels of different phosphorus forms in a descending order: detrital P>Authigenic P>Organic P>Fe-P>Loosely P. Bioavailable phosphorus concentration was between 153ppm and 240ppm and consisted 37.21±3% of total phosphorus. Based on molar ratio of TOC/OP, organic matter obtained from the studied stations suggested a terrestrial origin.

Keywords: Bioavailability; Caspian Sea; Phosphorus; Surface sediment.

MeSH terms

Biological Availability
China
Environmental Monitoring
Geologic Sediments / analysis*
Phosphorus / analysis*

Substances

Phosphorus