Abstract Heavy metal pollution in the sediments of Çalışlar and Akçaova Streams may expose hazardous risk to environment and public health through food chain in Ordu province of southeastern Black Sea region of Turkey. The enrichment and distributions of the heavy metals in the sediments of these two streams demonstrated a decreasing trend in the mean heavy metal toxic levels in mg kg−1 as follows Fe (8135.27) > Mn (272.56) > Zn (25.68) > Cu (13.03) > Co (5.13) > Pb (3.74) > Ni (3.62) > Cr (3.52) > Cd (0.005) in Çalışlar Stream and Fe (9939.12) > Mn (286.97) > Zn (24.24) > Cu (19.31) > Ni (10.95) > Co (6.2) > Cr (4.90) > Pb (3.97) > Cd (0.09) > Ag (0.07) in Akçaova Stream, respectively. The sum of the toxic units of Fe, Mn, Zn, and Cu in both streams were significantly higher. The assessment of sediment pollution was carried out using multivariate statistical approaches and indices such as enrichment factor (EF), contamination factor (CF), geoaccumulation index (Igeo), and potential ecological risk factor (Eri). The results of the cluster analysis in both streams showed that Co, Pb, and Cr were mainly associated with natural sources. EF values indicated that the average concentration of all metals from both streams were lower than potential effect levels with the exception of Cu, and Ag in Akçaova Stream. Relatively low levels of pollution indicators in Çalışlar Stream pointed out no environmental contamination and suggested that metal contamination sourced most likely from the naturally present minerals in the area. Akçaova Stream sediments were moderately contaminated with Cu (EF > 2), and significantly contaminated with Ag (EF = 5 − 20) according to the average EF values attributable to anthropogenic activities.

中文翻译：

---

黑海东南部附近两条河流沉积物中的重金属：污染和生态风险评估

摘要 土耳其东南部黑海地区奥尔杜省Çalışlar 和Akçaova Streams 沉积物中的重金属污染可能通过食物链对环境和公众健康造成危害。这两条河流沉积物中重金属的富集和分布表明，平均重金属毒性水平（mg kg-1）呈下降趋势，如下所示：Fe (8135.27) > Mn (272.56) > Zn (25.68) > Cu ( Çalışlar Stream 中的 13.03) > Co (5.13) > Pb (3.74) > Ni (3.62) > Cr (3.52) > Cd (0.005) 和 Fe (9939.12) > Mn (286.97) > Zn (24.24) > 1 Cu (19) > Ni (10.95) > Co (6.2) > Cr (4.90) > Pb (3.97) > Cd (0.09) > Ag (0.07) 在 Akçaova Stream 中，分别。两种流中的 Fe、Mn、Zn 和 Cu 有毒单元的总和显着更高。沉积物污染评估采用多元统计方法和指标，如富集因子（EF）、污染因子（CF）、地质累积指数（Igeo）和潜在生态风险因子（Eri）。两个溪流的聚类分析结果表明，Co、Pb 和 Cr 主要与天然来源有关。EF 值表明，除了 Akçaova Stream 中的 Cu 和 Ag 之外，两种流中所有金属的平均浓度都低于潜在影响水平。Çalışlar Stream 中相对较低的污染指标表明没有环境污染，并表明金属污染最有可能来自该地区天然存在的矿物。Akçaova Stream 沉积物被 Cu (EF > 2) 中度污染，