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Spatial distribution and ecological risk assessment of trace metals in surface sediments of Lake Qaroun, Egypt

机译:埃及Qaroun湖表层沉积物中微量金属的空间分布和生态风险评估

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A suite of trace metals was determined in twenty surface sediments collected from Lake Qaroun, which is designated as a natural reserve in 1989 to examine their spatial distribution and their potential environmental impact on the lake. Contamination factor (C-f), enrichment factor (EF), geoaccumulation index (I-geo), and pollution load index (PLI) are applied to evaluate the quality of the lake. The highest concentrations were detected in the eastern portion of the lake near Al-Bats drain. The levels of Ba exceeded the toxicity reference value (TRV) (20 ng/g dw) set by US EPA for all sediments, while sediments collected from Al-Bats region exceeded the TRV for Zn (68 ng/g dw). Arsenic, Ba, Sn, Co, Cu, and Hg are poorly correlated with background value of Fe suggesting anthropogenic activities over the entire lake. The values of C-f and I-geo confirmed that the eastern portion of the lake has been found moderately to considerably contaminated by As, Sn, and Zn. Sediments collected from the eastern location (S1) were very highly enriched of Sn (22.47); however, the other eastern locations were highly enriched of Sn, As, Cd, Co, and Ba. It is clear that sites near Al-Bats and El-Wadi drains are hot spots, which got immense amounts of domestic, agricultural, and industrial wastes. Behind the influence of these discharges, concentrations are decreased. The PLI over the entire lake ranged from 0.247 to 0.801 for all sites, which reflect unpolluted status.
机译:在1989年指定为自然保护区的Qaroun湖收集的二十种表面沉积物中确定了一组痕量金属,以检查其空间分布及其对湖泊的潜在环境影响。污染因子(C-f),富集因子(EF),地质累积指数(I-geo)和污染负荷指数(PLI)用于评估湖泊的质量。在巴特人流失附近的湖东部发现了最高浓度。 Ba的含量超过了美国环保署为所有沉积物设定的毒性参考值(TRV)(20 ng / g dw),而从Al-Bats地区收集的沉积物超过了Zn的TRV(68 ng / g dw)。砷,钡,锡,钴,铜和汞与铁的本底值相关性很低,这表明整个湖区都有人为活动。 C-f和I-geo的值证实,该湖的东部地区已被中等,严重地污染了As,Sn和Zn。从东部位置(S1)收集的沉积物中锡的含量很高(22.47)。但是,其他东部地区的锡,砷,镉,钴和钡含量很高。显然,Al-Bats和El-Wadi排水沟附近的地点是热点地区,有大量的家庭,农业和工业废物。在这些放电影响的背后,浓度降低了。整个湖泊在所有地点的PLI范围从0.247到0.801,反映了未污染的状态。

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