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2012年4月9-16日在桂江流域采集河流水样15个进行分析测试。研究结果表明:(1)桂江河水样品pH值介于6.36～8.46,平均值为7.58;EC范围为18～316μs/cm,平均值为175μs/cm;流域河水SIc平均值为-0.7,其变化受流域碳酸盐岩的分布控制。(2)桂江的水为HCO3-Ca型水,HCO3-和Ca2+平均分别占阴、阳离子的76%和77%,主要来自岩石风化。(3)中游部分河水NO3-和SO24-较高,可能是受工农业等人类活动的影响引起,此外硫酸参与了碳酸盐矿物的溶解。(4)Ca2+、Mg2+和HCO3-总体呈现中游高,上游和下游较低;SO24-和NO3-仅在中游部分受到人类活动影响较多的支流偏高,上下游相对较低且相差不大;Cl-、Na+和K+则呈现出中下游较高,上游较低的特征。
From April 9 to April 16, 2012, 15 river water samples were collected for analysis and testing in the Guijiang River Basin. The results show that: (1) The water samples of Guijiang River have a pH value of 6.36 ~ 8.46 with an average of 7.58; EC range of 18 ~ 316μs / cm with an average value of 175μs / cm; mean value of SIc Changes are controlled by the distribution of carbonate rocks in the basin. (2) The water of Guijiang River is HCO3-Ca type water, and the average of HCO3- and Ca2 + accounts for 76% and 77% of the anions and cations, respectively, mainly from rock weathering. (3) The higher NO3- and SO24- in the middle part of the river may be caused by the human activities such as industry and agriculture. In addition, sulfuric acid is involved in the dissolution of carbonate minerals. (4) Ca2 +, Mg2 + and HCO3- are generally high in the middle and lower in the upper and lower reaches. SO4- and NO3- are mostly higher in the middle reaches due to more human activities, with relatively lower and lower reaches, with little difference. Cl-, Na + and K + showed a higher mid-lower reaches, lower upstream characteristics.