Identifying toxic elements in water, sediments, and roots of mangrove forest (Avicennia marina) in Chabahar Bay, Sea of Oman

被引：0
作者：
Partani, Sadegh [1 ]
Danandeh Mehr, Ali [2 ,3 ]
Amir Ahmadi, Kaveh [4 ]
Alaei, Milad [4 ]
Maghrebi, Mohsen [5 ]
Taniwaki, Ricardo Hideo [6 ]
Jafari, Ali [1 ]
机构：
[1] Department of Civil Engineering, Faculty of Engineering, University of Bojnord, Bojnord
[2] Civil Engineering Department, Antalya Bilim University, Antalya
[3] MEU Research Unit, Middle East University, Amman
[4] Islamic Azad University, Central Tehran Branch
[5] Department of Civil Engineering, University of Gonabad, Gonabad
[6] Engineering, Modelling and Applied Social Sciences Center, Federal University of ABC, Av. dos Estados, SP, Santo Andre
来源：
Science of the Total Environment | 2024年 / 954卷
关键词：
Chabahar Bay; Coastal wetland; Mangrove; Sediment; Toxic elements;
D O I：
10.1016/j.scitotenv.2024.176635
中图分类号：
学科分类号：
摘要：
Mangroves play a crucial role in filtering pollutants from water and sediments. However, excessive accumulation of potentially toxic elements (PTEs) has harmful effects on marine organisms. This article investigates the concentration and distribution of PTEs in water, sediment, and the roots of endangered mangrove species in Chabahar Bay, a subtropical coastal wetland. The relationship between PTE absorption and accumulation rates with flow rate, mangrove extent, and sedimentation was also explored. Water, sediments, and aerial roots samples were taken at four stations along the wetland from upstream fresh water toward outfall. According to the results, Cd had more distribution in sediment and water samples and plants did not play as adsorbent in the study area. The lowest and highest PTEs concentrations were detected in water and sediment media, respectively. The average concentrations of PTEs in the sediments in the Chabahar Bay were Fe > Cr > Zn > Ni > Cu > Pb > Co > As > Cd while in aerial roots of the mangroves were Fe > Zn > Ni > Cr > Cu > Co > As > Pb > Cd. Except Zn, As, and Cd, there was a good correlation between increasing PTEs content in the sediments with decreasing flow velocity and increasing vegetation density along stations 3 to 4. In addition, the amount of PTEs uptake by the mangroves was less than that of global wetlands. The results also demonstrated a greater uptake in aerial roots in saline water for Cr, Ni and Co. Since the absorption rate of PTEs by the aerial roots of pneumatophores is slower than that in sediments, elevated concentrations of PTEs in the sediment can disrupt the entire ecosystem, leading to a potential decline in biodiversity. These toxins can enter the food chain, affecting not only organisms directly interacting with the sediment but also higher trophic levels, such as fish and birds. © 2024 Elsevier B.V.
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