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 (RQ_SEM-PEL and RQ_SEM-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.

为了跟踪 Cu、Zn、Cd、Pb 和 Ni 的污染状况和生物利用度，将当前研究的酸挥发性硫化物 (AVS) 和同时提取的金属 (SEM) 模型与 8 年前在 Edku 和 Mariut 湖中进行的研究进行了比较. 沉积物样本于 2019 年冬季和夏季从这两个湖泊采集。根据 SEM/AVS 模型，冬季金属污染高于夏季。据报道，这两个湖泊的金属毒性略有增加。根据风险商数（RQ _SEM-PEL和 RQ _SEM-TEL) 两湖均为中度污染。对于 Edku 和 Mariut 湖，Fe/AVS 比率的结果分别在 6.77 至 226.87 和 2.88 至 36.38 μmol/g 的范围内。这表明 [SEM]/[AVS] 比率高估了金属的可用性。在 Mariut 和 Edku 湖中，总有机质与 ∑SEM（r = 0.74 和 0.39，p < 0.05）之间分别报告了正相关性。建议进行多年 SEM-AVS 研究。