Abstract:

Groundwater is the main source of supply water in Red River Delta, however there is high concentration of arsenic in groundwater up to 3-500g/L. This contamination came from variables source. This research aims to evaluate the distribution characteristic of arsenic in Quaternary sediment mineral in Dan Phuong. This is also as a base for determining the origin of arsenic contamination in groundwater. The methods used in this research include undisturbed sediment sampling during drilling, grain size analysis, using microscopy to separate mineral group and analysis arsenic concentration in mineral groups. The results show that concentration of arsenic in Biotite group mineral and rock fragments is much higher than the average concentration of arsenic in Earth’s crust, and much higher than concentration of arsenic in chlorite, fenspat, muscovite and mafic mineral group.