Reactive sulfide dynamic models for predicting metal hazardous in sediments of two northern Egyptian Lakes. (March 2023)

• Record Type: Journal Article
• Authors: El Zokm, Gehan M.; Masoud, Mamdouh S.; El-Shorbagi, Essam Kh.; Elsamra, Rehab M.I.; Okbah, Mohamed A.
• Is Part Of: Marine pollution bulletin. Volume 188(2023)
• Publication Date: 2023-03
• Subjects: Nile delta lakes -- AVS -- SEM -- Risk assessment -- Sulfide models- benchmarks; Marine pollution -- Periodicals; Marine Biology -- Periodicals; Water Pollution -- Periodicals; Mer -- Pollution -- Périodiques; Publications périodiques; Pollution des mers; Lutte antipollution; Electronic journals; 363.7394
• DOI: 10.1016/j.marpolbul.2023.114694
• Languages: English
• ISSNs: 0025-326X

Abstract

Abstract: To track pollution status and bioavailability of Cu, Zn, Cd, Pb, and Ni, the current study's acid-volatile sulfide (AVS) and simultaneously extracted metals (SEM) models were compared to previous studies in Edku and Mariut lakes prior to 8 years. Sediment samples were collected in winter and summer 2019 from the two lakes. Metal pollution is higher in the winter than in the summer, according to SEM/AVS models. Metal toxicity is reported to have increased slightly in both lakes. According to risk quotients (RQSEM-PEL and RQSEM-TEL ) the two lakes are moderately polluted. The results of the Fe/AVS ratio were in the range of 6.77 to 226.87 and 2.88 to 36.38 μmol/g for Edku and Mariut lakes, respectively. This indicated that [SEM]/[AVS] ratios overestimate the availability of metals. A positive correlation was reported between total organic matter and ∑SEM (r = 0.74 and 0.39 at p < 0.05) in Mariut and Edku lakes, respectively. Multiple-year SEM-AVS studies are recommended. Graphical abstract: Unlabelled Image Highlights: Apportionment of AVS and SEM in Edku and Mariut lakes sediments is screened. The lakes were classified based on AVS. AVS-SEM was compared to previous studies in the two lakes prior to 8 years to track pollution status. Sediment toxicity was evaluated by sulfide models, RQSEM-TEL and RQSEM-PEL.