Study on distribution law of TDS and main ion concentration in groundwater in the Ordos Cretaceous Artesian Basin

The distribution law of TDS and main ion concentration in groundwater with three circulating depths of shallow,middle and deep level has been studied in the Ordos Cretaceous Artesian Basin by 1124 hydrochemical samples.On the whole,TDS and main ion concentration in groundwater in the north of the basin are lower than those in the south of the basin.And fresh water is more rich in the north of the basin than that in the south.Fresh water in the north of the basin distributed mainly in shallow and...