%0 Conference Proceedings %T Assessment of Ni and Zn Contamination in Polluted Soil by Kriging Method in Northeast Iran (Mashhad) %A Shirani, Maedeh %A Fotovat, Amir %A Khademi, H %A Haghnia, Gholam Hosain %A Lakzian, Amir %J 10th International Conference on the Biogeochemistry of Trace Elements %D 2009