Hetao Plain Linhe High Arsenic Groundwater Distribution And Water Chemistry Characteristics

In this paper through the outdoor synthesis investigation, the remote sensing image analysis, geophysical survey, drills and so on synthesis investigation methods, more systematic analysis been done between He Tao plain arsenic element spatial distribution rule and ground water dynamic characteristic, geological environment essential factor, climatic environment, and human activity relations. Laboratory analysis also has carried on the underground water sample, the soil sample, the isotope to obtain comprehensive and an accurate data.The research indicated that this area high arsenic ground water mainly distributes in northeast part of investigation area, belongs to the He Tao plain deposition center in the region, assumes the small laminated distribution partially, in the short distance inland sewer arsenic content change is Obviously; ground water in investigation area temperature is 11-16.3℃; pH is 7.4-8.9, the arsenic content is bigger than the 0.1mg/1, its ph between 8-9, the soil layer acidity and alkalinity to the arsenic adsorption leading role, along with the pH value's markup, on the soil colloid the positive charge reduces nearly, reduces to the arsenic adsorptive capacity, the soluble content advances correspondingly, causes in the ground water the arsenic content also to grow; The Oxidation-Reduction Potential (ORP)of the water is - 163-+67mV, the arsenic content is bigger than 0.05mg/l, ORP is a negative value, its value between - 60-150.Ground water chemistry characteristic performance for Carbonate with alkaline soil and alkalinity non-carbonate water primarily. Investigates in the area to exceed the allowed figure the serious component to have total hardness (exceeding rate 43.6%), SO₄^2- (exceeding rate 41%), Cl^- (exceeding rate 42.3%), Fe (exceeding rate 67.9%), NO₂^- (exceeding rate 5.1%), F^-(exceeding rate 16.7%), As (exceeding rate 28.2%).From various components' relevant analysis knowing that in the contaminated zone relations between ground water's arsenic content and the total iron, total phosphorus and Oxidation-Reduction Potential are more obvious, had specially known the ground water arsenic contaminated zone simultaneously is also the iron exceeding the allowed figure distribution area. Looking from the soil lab results analysis, between the arsenic and the soil granularity has the very big relevance, namely the soil granularity is thinner, the arsenic content is higher, this concerns with the soil in arsenic main adsorption condition existence. Because, the soil granularity is small, the surface area is big, is also bigger to the arsenic adsorptive capacity. However, the granularity is the soil arsenic content primary control factor, but surface layer soil, because direct and aerosphere and biosphere contact, the control arsenic's is more complex in soil existence factor, the granularity is in many influencing factor one merely.