Analysis of some metals Fe, Co, Mn, Ni in surface sediments in Cau river basin, Thai Nguyen province by single extraction method. The results show that the heavy metals Co, Mn exist in three main forms: exchanging - binding with carbonate, binding with iron oxide - manganese and residue. Fe, Ni exist in many forms associated with the oxide of iron - manganese and the residue. The distribution of the total content of the heavy metals is uneven at the sampling locations and in the order Fe>
Mn>
Ni>
Co.