The northeast middle part of the China, which lies in the humid and semi-humid climatical regions of the temperate zone, is a very important soybean and other main grain crops production region in China.The contents of chemical elements, such as K, Na, Ca, Mg, Fe, Mn, Zn, Sr, Cu, Cr, Ni, Pb, Cd, Hg, Se etc., in the unpolluted seeds of maize, sorghum, rice and soybean are determined by atomic absorption spectrophotometry, anodic stripping voltammetry and fluorescence spectrophotometry. The data are treated t...