There are a large variety of factors that affect the amount of the metal of interest in the seedlings. Surely, the first is the types and states of the metal itself. This includes different types of oxidation states due to the fact that most metals, in particular transition metals, have various oxidation numbers which of course exhibits a wide range of behaviors and toxicity. Furthermore, accompanying anions also have subtle influence on the metal concentrations in rice seedlings, mainly due to the uptake mechanisms. The next parameters should involve rice growing conditions covering periods of time, in other words, the number of days of growing, the types of nutrients or fertilizers, the methods of growing, species of rice or even the weather and environment conditions. These sophisticated parameters make the studies of