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TDS-Eh graph analysis： a new water quality index and rural water supply implications of a river affected by mining in south-eastern Nigeria

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Frontiers of Earth Science 2012年第1期6卷 66-74页

作者： I.C.EZEKWE A.O.AISUBEOGUN G.N.CHIMA E.ODUBO Department of Geography and Environmental Management Niger Delta UniversityWilberforce IslandPMB 071Yenegoa Nigeria Department of Geography and Planning Abia State UniversityPMB 2000UturuNigeria

The Ivo River Basin of south-eastern Nigeria is a water scarce and mining region, which suffers from water scarcity. The influence of mining activities on the quality of the Ivo River and its capacity for community water supply was investigated. Also the efficacy of TDS-Eh graph in explaining water quality was presented. Results indicated that the TDS-Eh graph highlights subtle chemical relationships which control water quality and provide a simple but generic pollution index for rapid water quality assessment. It was also discovered that the Ivo River could become an adequate alternative to groundwater as a source of rural water supply in the study area with an estimated average daily discharge of 6726000L and a rural population of less than 200000 persons. The Ivo River meets the WHO drinking water standards in 20 physico- chemical water quality parameters （pH, temperature, conductivity, turbidity, salinity, TDS, Eh, alkalinity, chloride, nitrate, sulfate, phosphate, calcium, magnesium, iron, manganese, zinc, lead and cadmium） analyzed and can therefore （with little treatment） provide up to 133.4% of average community water demand and 83.8% of maximum community water demand. The. impact of mining on Ivo River quality was found to have been moderated by the presence of carbonate rocks which may have enhanced the precipitation of heavy metals from the river.

关键词： TDS-Eh graph water quality mining ruralwater supply Ivo River Nigeria

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