X-ray fluorescence analysis has been successfully used for multi-elemental analysis of
plant samples [8]. In XRF spectroscopy, X-rays are used as source of energy to excite all
possible elements in a sample. Relaxing to the ground state, X-rays of lower energy are emitted
from the sample. The emitted X-rays are element specific and the sensitivity of XRF depends on
the differential cross section of X-ray absorption and non-elastic scattering of the element. Heavy
elements such as Mn, Fe, Cu, Ni, and Zn are easily detected, while light elements such as S, P,