Abstract

The objectives of this study were to evaluate the physicochemical properties of drinking water sources at Ihiala, Nigeria, and to assess the water quality using the heavy metal pollution index, heavy metal evaluation index and contamination index models. Physicochemical parameters like pH, total hardness, total dissolved solids, nitrate, cyanide, residual chlorine and six metals (Al, Cd, Cr, Cu, Pb and Ni) were analyzed in the water samples, and heavy metal pollution indices computed. The spring and borehole waters had better organoleptic properties compared to stream, river and sachet waters. Total hardness, pH and nitrate were the major nonmetallic contributors to the poor water quality. The mean pollution indices were: heavy metal pollution index (HPI) 143.02 ± 71.16, heavy metal evaluation index (HEI) 7.53 ± 4.12 and contamination index (C_d) 1.53 ± 4.12. Sixty percent of the samples exceeded the critical HPI value of 100. There was significant (P < 0.01) positive correlation between HPI and C_d, HPI and HEI (r = 0.886) and HEI and C_d (r = 1.000). Lead contributed most to heavy metal pollution of water in the region. The quality of most water sources in Ihiala is not good for drinking.

摘要

这项研究的目的是评估尼日利亚Ihiala饮用水源的理化特性，并使用重金属污染指数，重金属评估指数和污染指数模型评估水质。在水样中分析了诸如pH，总硬度，总溶解固体，硝酸盐，氰化物，残留氯和六种金属（Al，Cd，Cr，Cu，Pb和Ni）的理化参数，并计算了重金属污染指数。与溪流，河水和香囊水相比，泉水和井眼水具有更好的感官特性。总硬度，pH和硝酸盐是造成不良水质的主要非金属因素。平均污染指数为：重金属污染指数（HPI）143.02±71.16，重金属评估指数（HEI）7.53±4.12和污染指数（C_d）1.53±4.12。60％的样本超过了临界HPI值 100。HPI与C _d，HPI与HEI（r = 0.886）和HEI与C _d（r = 1.000）之间存在显着正相关（ P <0.01）。铅是造成该地区水重金属污染的最主要因素。伊亚拉（Ihiala）大部分水源的水质都不佳。