Reactive sulfide dynamic models for predicting metal hazardous in sediments of two northern Egyptian Lakes

• Published in: Marine pollution bulletin 2023-03, Vol.188, p.114694-114694, Article 114694
• Main Authors: El Zokm, Gehan M., Masoud, Mamdouh S., El-Shorbagi, Essam Kh, Elsamra, Rehab M.I., Okbah, Mohamed A.
• Format: Article
• Language: English
• Subjects: AVS; Egypt; Environmental Monitoring - methods; Geologic Sediments; Lakes; Metals - analysis; Metals, Heavy - analysis; Nile delta lakes; Risk assessment; SEM; Sulfide models- benchmarks; Sulfides - analysis; Water Pollutants, Chemical - analysis
• ISSN: 0025-326X; 1879-3363
• DOI: 10.1016/j.marpolbul.2023.114694

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