Evaluation of Heavy Metal Contamination and Ecological Risk Assessment in Sediments of Karun using Aquatic Pollution Indices

Archives of Hygiene Sciences Pub Date : 2020-03-01 DOI:10.29252/ARCHHYGSCI.9.1.10

F. Hedayatzadeh, N. Hassanzadeh

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引用次数: 2

Abstract

Background & Aims of the Study: The current study was designed to determine the quality of sediments in Karun in Ahvaz, Iran, according to aquatic pollution indices.Materials and MethodsThe sediment samples were obtained from six river stations in summer and winter. The sediment samples were air-dried, sifted, homogenized, and stored in plastic bags, and the concentrations of metals were determined in the laboratory.ResultsThe obtained findings revealed that the mean concentrations of lead, zinc, chrome, and cadmium were 26.27, 72.36, 53.47, and 3.85 mg/kg dw in summer and 13.41, 59.54, 30.28, and 0.42 mg/kg dw in winter, respectively. According to the mean scores of the potential ecological risk index (PERI), in two seasons, the sediment enrichment with metals was observed in the order of Cd > Pb > Cr > Zn; however, according to biological toxicity test (the effects range-median quotient), the sequences of the metals during summer and winter were Cd > Cr > Zn > Pb and Zn > Cr > Pb > Cd, respectively. The comparison of indices between stations showed that in summer, stations 3 and 4 were medium-low priority side according to the mean effects range-median quotient (mERM-Q) and were reported with moderate ecological risk based on the PERI. In winter, stations 2 and 4 had a medium-low priority side and moderate ecological risk according to mERM-Q and PERI, respectively. The results of hazard quotient (HQ) and modified hazard quotient also showed that the HQ values of Pb and Zn (0.1

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基于水体污染指数的卡伦河沉积物重金属污染评价及生态风险评价

研究背景与目的:本研究旨在根据水生污染指数确定伊朗阿瓦士Karun地区沉积物的质量。材料与方法夏季和冬季在6个河流站点采集沉积物样本。沉积物样品经风干、筛分、均质后装入塑料袋中保存，并在实验室测定金属浓度。结果夏季铅、锌、铬、镉的平均浓度分别为26.27、72.36、53.47、3.85 mg/kg dw，冬季分别为13.41、59.54、30.28、0.42 mg/kg dw。根据潜在生态风险指数(PERI)的平均得分，两个季节沉积物中金属富集的顺序为Cd > Pb > Cr > Zn;但根据生物毒性试验(效应范围-中位商)，夏季和冬季的金属序列分别为Cd > Cr > Zn > Pb和Zn > Cr > Pb > Cd。站间指数比较表明，夏季3、4站的平均效应差中值商(mERM-Q)为中低优先级，PERI为中等生态风险;冬季，2站和4站的mERM-Q和PERI分别为中低优先级和中等生态风险。危害商数(HQ)和修正危害商数结果也显示，Pb和Zn的HQ值均为0.1< HQ

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