Spatial and temporal dynamics and fluxes estimation of manganese fractions in sediments from the Pearl River Estuary, southern China

Zhiping Ye; Jianyao Chen; Zuobing Liang; Shaoheng Li; Shin-Ichi Onodera; Mitsuyo Saito; Gnanachandrasamy Gopalakrishnan

doi:10.1016/j.marpolbul.2023.115719

Spatial and temporal dynamics and fluxes estimation of manganese fractions in sediments from the Pearl River Estuary, southern China

Mar Pollut Bull. 2023 Dec:197:115719. doi: 10.1016/j.marpolbul.2023.115719. Epub 2023 Nov 2.

Authors

Zhiping Ye¹, Jianyao Chen², Zuobing Liang³, Shaoheng Li³, Shin-Ichi Onodera⁴, Mitsuyo Saito⁴, Gnanachandrasamy Gopalakrishnan⁵

Affiliations

¹ School of geography and tourism, Huizhou University, Huizhou, 516007, China.
² Guangdong Provincial Key Laboratory of Urbanization and Geo-simulation, School of Geography and Planning, Sun Yat-Sen University, Guangzhou, 510275, China. Electronic address: chenjyao@mail.sysu.edu.cn.
³ Guangdong Provincial Key Laboratory of Urbanization and Geo-simulation, School of Geography and Planning, Sun Yat-Sen University, Guangzhou, 510275, China.
⁴ Graduate School of Integrated Arts and Sciences, Hiroshima University, 1-7-1Kagamiyama, Higashi-Hiroshima, 739-8521, Japan.
⁵ Department of Earth Sciences, School of Physical, Chemical, and Applied Sciences, Pondicherry University, Puducherry, 605104, India. Electronic address: samygnanam@gmail.com.

PMID: 37922754
DOI: 10.1016/j.marpolbul.2023.115719

Abstract

Sequential extraction was used to study the historical dynamics and fluxes of the chemical fractions of manganese (Mn) in sediments collected from the Pearl River Estuary (PRE), southern China. Results revealed that the proportion of Mn associated with different fractions decreased in the order of acid-soluble fraction (F1) > reducible fraction (F2) > residual fraction (F4) > oxidizable fraction (F3). F1 (47%) was the dominant Mn fraction, indicating the strong bioavailability of Mn to aquatic organisms in the PRE. In addition, the Mn fraction F2 was present at an average rate of 27.93 % in surface sediments, indicating that it could be mobilized when environmental conditions become increasingly reducing or oxidizing. The decline in Mn fraction fluxes after 2006 indicated that the region has partially decreased due to the removal of heavily polluting industries and effective control of sewage discharge.

Keywords: Fraction; Manganese; Pearl River Estuary; Sediment; Temporal dynamics.

MeSH terms

China
Environmental Monitoring / methods
Estuaries
Geologic Sediments / chemistry
Manganese
Metals, Heavy* / analysis
Rivers / chemistry
Water Pollutants, Chemical* / analysis

Substances

Metals, Heavy
Manganese
Water Pollutants, Chemical