Department of Natural Resources, Isfahan University of Technology, Isfahan 84156-83111, Iran.
Water Sci Technol. 2009;60(9):2319-27. doi: 10.2166/wst.2009.669.
Water quality of the Zayandehrud River, located in an arid region of central part of Iran, was assessed using National Sanitation Foundation Water Quality Index (NSF WQI) calculated by four aggregation methods. Water samples were collected monthly (July 2006 to June 2007) from eight stations in the middle of the river. The parameters required for the NSF WQI calculations including saturation percent of dissolved oxygen, biochemical oxygen demand, fecal coliforms, pH, nitrate, total phosphate, temperature deviation, total dissolved solids and turbidity were measured. According to WQI(m) which appeared to be more adapted to environmental conditions of the Zayandehrud River, the studied section of the river was considered as "reasonable" to "polluted" water quality. All of the calculated water quality indices showed the lowest values in August. In addition to BOD(5) and fecal coliform amounts which were generally high, nitrate and total phosphate concentrations were also considerably increased due to agriculture practices in August. Generally, BOD(5) and fecal coliforms are the main water quality subindices that reflect the effect of anthropogenic activities on the water quality of this river.
伊朗中部干旱地区的扎扬德河的水质采用国家卫生基金会水质指数（NSF WQI）进行评估，该指数通过四种聚合方法计算得出。水样于 2006 年 7 月至 2007 年 6 月期间每月从河流中部的八个站点采集。NSF WQI 计算所需的参数包括溶解氧饱和度、生化需氧量、粪大肠菌群、pH 值、硝酸盐、总磷酸盐、温度偏差、总溶解固体和浊度。根据 WQI(m)，该方法似乎更适应扎扬德河的环境条件，研究河段被认为是“合理”到“污染”的水质。所有计算出的水质指数均显示 8 月的数值最低。除了 BOD(5)和粪大肠菌群数量普遍较高外，由于 8 月农业活动的影响，硝酸盐和总磷酸盐的浓度也大幅增加。总的来说，BOD(5)和粪大肠菌群是反映人类活动对这条河水质影响的主要水质子指数。
