FAAS Determination of Metal Elements in Crops Grown in Coal Gangue Soil

The sample of crops grown in coal gangue soil was treated by dry ashing method, and the contents of 6 elements, including Ca, Mg, Cu, Zn, Fe and Mn, were determined by FAAS. Linear relationships between values of absorption and mass concentration of 6 elements were obtained in the definite ranges, with detection limits (3s) in the range of 0.002-0.017 mg·L-1. Values of recovery and RSD′s (n=6) found were in the ranges of 96.8%-106.1% and 0.17%-4.25% respectively. The proposed method was applied to the determination of the 6 elements in corn, horsebean and pea grown in coal gangue soil and sandy soil, and the result indicated that the contents of 6 elements in crops grown in coal gangue soil were higher than those grown in sandy soil. Relatively higher contents of Mg were found in broad-bean, and of Fe as well as Mn were found in pea, which were grown in coal gangue soil.