Seasonal variability of water quality by physicochemical indexes and traceable metals in suburban area in Kikwit, Democratic Republic of the Congo
Seasonal variability of water quality by physicochemical indexes and traceable metals in suburban area in Kikwit, Democratic Republic of the Congo
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DOI：
10.1016/j.iswcr.2017.04.004
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发表时间：
2017-06
影响因子：
6.4
通讯作者：
Alexis B. Nienie;P. Sivalingam;Amandine Laffite;P. Ngelinkoto;J. Otamonga;Alphonse Matand;C. Mulaji;J. I. Mubedi;P. Mpiana;J. Poté
中科院分区：
文献类型：
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作者：
Alexis B. Nienie;P. Sivalingam;Amandine Laffite;P. Ngelinkoto;J. Otamonga;Alphonse Matand;C. Mulaji;J. I. Mubedi;P. Mpiana;J. Poté
水资源污染仍然是发展中国家若干区域的一个主要问题，特别是在撒哈拉以南国家，受污染的沃茨对人类健康和环境构成严重威胁。对采自威尔斯（n=3）和两条河流（卢克米河）的水样进行了pH、温度（T）、电导率（EC）、溶解氧（O2）、溶解有机碳（DOC）、总有机碳（TOC）和微量金属等理化参数的季节变化研究（RLK，n=3）和Luini河（RLN，n=2）位于基奎特市（刚果奎卢省）。在旱季和雨季采集样本。采用电感耦合等离子体质谱法（ICP-MS）测定了水中微量金属（Cr、Mn、Co、Ni、Cu、Zn、As、Mo、Ag、Cd、Sn、Sb和Pb）的含量，采用离子色谱法测定了水中可溶性离子（Na+、K+、NH 4+、SO 42-、NO3-和Cl-）的含量。与旱季相比，雨季的pH值较低。在丰水期，威尔斯的pH值范围为4.12至5.60，河流为5.55至6.31，而在枯水期，威尔斯的pH值范围为6.27至6.98，河流为7.09至7.44。可溶性离子浓度和其他理化参数（O2，DOC和TOC）也随季节变化，在潮湿和干燥的季节较低的高。除锰外，在威尔斯和河流的水样中测得的其他微量金属的平均浓度符合世界卫生组织（世卫组织）的饮用水/生活用水质量准则。在旱季和雨季，分析的水样中锰浓度分别在634至812和1352-1741 µg L− 1之间。这些结果表明，锰在水中的高浓度可以解释的地质成因和自然风化过程的结果。在一般情况下，根据分析的参数，在两个季节的研究从网站的水样似乎符合饮用水标准，根据世界卫生组织的准则，但有两个例外的pH值和锰。这项研究是很重要的，目前的情况下，可以应用在类似的环境隔室在未来评估发展中国家的安全饮用水的供应。
Water resource contamination is still a major concern in several regions of developing countries especially in sub-Saharan countries in which polluted waters pose serious risks to human health and the environment. The seasonal variation of the physicochemical parameters including pH, temperature (T), electrical conductivity (EC), dissolved oxygen (O2), dissolved organic carbon (DOC), total organic carbon (TOC), and trace metals were assessed in water samples collected from wells (n=3) and two rivers which were the River Lukemi (RLK, n=3) and River Luini (RLN, n=2) located in the City of Kikwit (Province of Kwilu, Democratic Republic of the Congo). Samples were collected during the dry and wet seasons. The concentration of trace metals (Cr, Mn, Co, Ni, Cu, Zn, As, Mo, Ag, Cd, Sn, Sb, and Pb) in water was measured using Inductively Coupled Plasma Mass Spectrometry (ICP-MS), and soluble ions (Na+, K+, NH4+, SO42-, NO3-, and Cl-) analysis was performed using Ion Chromatography.The results indicate the seasonal difference in the physicochemical composition of water e.g., the pH was lower in the wet compared to the dry season. pH values during the wet season ranged from 4.12 to 5.60 in wells and from 5.55 to 6.31 in rivers while the dry season values ranged from 6.27 to 6.98 in wells and from 7.09 to 7.44 in rivers. The concentrations of soluble ions and other physicochemical parameters (O2, DOC and TOC) also varied with the seasons, being higher in the wet and lower in the dry season. With the exception of Mn, the average concentrations of other trace metals measured in water samples from wells and rivers met the World Health Organization (WHO) guidelines for drinking/domestic water quality. Mn concentration in water samples analysed ranged between 634 to 812 and 1352–1741 µg L−1during the dry and wet seasons, respectively. These results imply that the high concentration of Mn in the water samples may be explained by the geological origin and result of natural weathering processes. In general, according to the parameters analysed, the water samples taken from the sites studied in both seasons appear to meet drinking water standards according to the WHO guidelines but with the two exceptions of the pH and Mn.This study is important for the present situation and can be applied in similar environmental compartments in the future to assess the availability of safe drinking water in developing countries.