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根据河套平原典型剖面浅层地下水砷的分布及地质环境特征,得出自剖面北部扇顶向扇前平原呈现地下水中砷含量逐渐升高的趋势,并在扇前平原和黄河冲湖积平原交界的洼地处,砷浓度达到峰值;向南部进入黄河冲湖积平原,砷浓度普遍较低。结合水化学Schoeller图和地质环境特征,推测此洼地的高砷可能来源于山前深大断裂深部水侵染,并随山前地下水径流在扇前洼地沉积浓缩,在还原环境下解析富集。典型剖面南部黄河冲湖积平原低砷区的地下水水化学组成与黄河水水化学Scoeller曲线极为相似,说明此处地下水砷来源与黄河水灌溉有着密切关系。
According to the distribution and geological characteristics of arsenic in the shallow groundwater in the typical section of the Hetao Plain, it is concluded that the arsenic content in groundwater gradually increases from the fan-head to the fan-head plain in the northern section of the Hetao Plain. At the depressions, the arsenic concentration reaches the peak value; in the south, it enters the Yellow River lacustrine plains and the arsenic concentration is generally low. According to the hydrochemistry Schoeller plot and the characteristics of geological environment, it is speculated that the high arsenic in the depression may be derived from the deep water intrusion in the piedmont fault, and deposited and concentrated in the foreland depression with the prehistoric groundwater runoff, then analyzed and enriched in the reducing environment. The typical hydrochemistry composition of groundwater in the low-arsenic area in the southern part of the Yellow River in the southern part of the Yellow River is very similar to that of the Yellow River’s hydrochemical Scoeller curve, indicating that the source of arsenic in groundwater is closely related to the irrigation of the Yellow River.