We presented result of soil properties and Arsenic content research in 2013, in the East Mongolia: Dornod aimag Khalkhgol, Matad, Bulgan, Bayantumen soums and Sukhbaatar aimag Erdenetsagaan soum. A total 200 soil samples take in the grid 20 x 40 km. Also analyzed soil organic, pH, carbonate and electric conductivity. Soil properties mean value is following: organic content is 2.388%, pH-7.3, carbonate (CaCO3)-0.80 %, electric conductivity – 0.079 dS/m, sand (2-0.05mm)-53.9%, silt (0.05-0.002mm)-35.3% and clay (<0.002mm)-10.8%. Soil Arsenic average content is 17.5 mg/kg with ranges 5-39 mg/kg. East Mongolian Soil Arsenic value is exceeding Mongolian national standard (As-6 mg/kg, MNS 5850:2008), that is only due of soil forming sediment content. Most of sampling area was only grazing land with very few peoples or even no humans in remote parts. Therefore, no influence of human activity for the soil Arsenic content. Comparatively high value of Arsenic content marked in the mountainous part of research area, where rock minerals close to the surface.
