The monitoring of water quality for both domestic and commercial use is absolutely essential for policy formulation that affects both public and environmental health. This study investigates the quality of water of river Molo system which lies in the Kenyan Rift Valley. The river is considered a vital source of water for the residents and industrial activities in Nakuru and Baringo Counties. Six water samples were collected during the dry season of December 2017. Various physicochemical parameters were determined in situ by use of a portable pH meter. These parameters included pH, temperature, electrical conductivity and total dissolved solids (TDS). Anions such as fluorides, sulfates, phosphates, nitrates, chlorides, carbonates and bicarbonates were determined using conventional methods such as titrimetry and (ultra-violet visible) UV–Vis techniques. The cations including sodium, potassium, calcium and magnesium were determined using flame photometry. The results showed that the water had pH values ranging from 7.90 to 9.66 units, temperature ranged from 14.02 to 31.5 °C, while electrical conductivity ranged from 181 to 1637 μS/cm, TDS (69–823 mg/L), F (2.76–3.28 mg/L), sulfates (4.97–85.66 mg/L), phosphates (0.13–11.06 mg/L), nitrates (1.73–6.16 mg/L), chlorides (38.5–69.4 mg/L), carbonates (18–148 mg/L), bicarbonates (54–384 mg/L), sodium (19–1800 mg/L), potassium (8.9–121 mg/L), magnesium (4.8–106.8 mg/L) and calcium (13.4–77.4 mg/L). The pH, temperature, fluorides and sodium were above the World Health Organization permissible limits for drinking water in S4 and S5. All the water samples fall under bicarbonate or freshwater zone. The sampling points can be classified into five water types: Na–Mg–Ca–HCO₃, Na–HCO₃, Na–Ca–Mg–HCO₃–CO₃, Na and Na–Ca–HCO₃–CO₃. Chemical indices such as sodium adsorption ratio, magnesium hazard, percent sodium and permeability index are reported. Accordingly, the findings from this work indicate that the river Molo water in general is good for irrigation.

中文翻译：

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肯尼亚莫洛河流域水质评估

对于影响公共和环境健康的政策制定，家庭和商业用水水质的监测是绝对必要的。这项研究调查了位于肯尼亚裂谷的莫洛河系统的水质。这条河被认为是纳库鲁和巴林戈县居民和工业活动的重要水源。2017年12月的干旱季节收集了六个水样。使用便携式pH计现场测定了各种理化参数。这些参数包括pH值，温度，电导率和总溶解固体（TDS）。阴离子，例如氟化物，硫酸盐，磷酸盐，硝酸盐，氯化物，使用滴定法和（紫外可见）UV-Vis技术等常规方法测定碳酸盐和碳酸氢盐。使用火焰光度法测定包括钠，钾，钙和镁在内的阳离子。结果表明，水的pH值范围为7.90至9.66单位，温度范围为14.02至31.5°C，电导率范围为181至1637μS/ cm，TDS（69-823 mg / L），F（2.76 –3.28 mg / L），硫酸盐（4.97–85.66 mg / L），磷酸盐（0.13–11.06 mg / L），硝酸盐（1.73–6.16 mg / L），氯化物（38.5–69.4 mg / L），碳酸盐（18 –148 mg / L），碳酸氢盐（54–384 mg / L），钠（19–1800 mg / L），钾（8.9–121 mg / L），镁（4.8–106.8 mg / L）和钙（13.4 –77.4 mg / L）。pH，温度，氟化物和钠含量高于世界卫生组织S4和S5中饮用水的允许限值。所有的水样都属于碳酸氢盐或淡水区。采样点可分为五种水类型：Na–Mg–Ca–HCO₃，Na–HCO ₃，Na–Ca–Mg–HCO ₃ –CO ₃，Na和Na–Ca–HCO ₃ –CO ₃。报告了化学指标，例如钠吸附率，镁危害，钠百分比和渗透率指数。因此，这项工作的发现表明，Molo河的水总体上很有利于灌溉。