哈科特港垃圾倾倒场地下水重金属污染及健康风险评价

A.A.S Bibiye, D. Ogbonna, Abere Sodienye A., Ayotamuno Augusta
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摘要

在2020年雨季和旱季对哈科特港垃圾倾倒场近端地下水摄取重金属污染和健康风险评估进行了调查。建立5个采样点,分别为GW1、GW2、GW3、GW4、GW5,命名为地下水(GW)。使用的控制站为GW5。使用原子吸收光谱仪对9种重金属(Cd、As、Mn、Cu、Hg、Ni、Fe、Pb和Zn)进行了测定,并与尼日利亚国家饮用水质量标准(NSDWQ)进行了比较。这些金属对成年男性、女性和儿童的每日估计摄入量(EDIM)显示,在旱季和雨季没有明显的健康问题。然而,非致癌性健康风险指数(HRI)显示,在雨季,对照站(GW5)的Pb浓度为4.000E+0 mg/kg/d,远高于女性(HRI<1)。GW1、gw2、gw3时儿童砷(As)值也高于平均值。各样位各重金属污染指数显示,GW1、gw3枯水期Fe含量较高,而GW4枯水期Cu含量较高,GW1、GW2 Fe含量较高,GW2 Mn含量较高。研究的重金属污染综合指数显示,旱季只有Fe浓度超过单位值,而雨季Cu、Fe、Pb和Mn浓度也较高。考虑到儿童和妇女可能通过摄入而暴露于地下水资源的脆弱性,这值得关注。本研究中观察到的重金属污染可能是由于人为活动和不受管制的卫生废物处理现象叠加而产生的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Heavy Metal Contamination and Health Risk Assessment of Groundwater Sources to Waste Dumpsites in Port Harcourt
Heavy metal contamination and health risk assessment of groundwater ingestion in proximal relation to waste dumpsites in Port Harcourt were investigated during the rainy and dry season of 2020. Five (5) sampling points were established and designated as Groundwater (GW) as follows: GW1, GW2, GW3, GW4, and GW5 respectively. The control station used was GW5. Nine (9) heavy metals (Cd, As, Mn, Cu, Hg, Ni, Fe, Pb, and Zn) were assessed during the period using an atomic absorption spectrometer and were compared with National Standard for Drinking Water Quality (NSDWQ) of Nigeria. The Estimated Daily Intakes of Metal (EDIM) of these metals for adult males, females, and children revealed no significant health issues during the wet and dry seasons. However, the Health Risk Index (HRI) for non-carcinogenic revealed that during the wet season Pb in the control station (GW5) had a concentration of 4.000E+0 mg/kg/day that was far higher than unity (HRI<1) for females. The Arsenic (As) values for children at GW1, 2, and 3 were also higher than unity. The pollution index for each heavy metal across sample location showed that Fe in GW1 and 3 during the dry season was high while in the wet season, values for Cu in GW4 was very high, Fe in GW1 and 2, and Mn in GW2 were higher than the unity. The overall pollution index of the heavy metal studied revealed that only Fe exceeded the unity value during the dry season whereas Cu, Fe, Pb, and Mn concentrations were also higher during the wet season. This calls for concern considering the vulnerability of children and women who may have been exposed to groundwater sources via ingestion. The heavy metal contamination as observed in this study may have occurred due to anthropogenic activities superimposed by the unregulated insanitary waste disposal phenomenon.
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