Methods to determine selenium in rice collected from Nonsan-Gun, Chungpook Province by graphite furnace atomic absorption spectrometry have been studied. Samples were dissolved by a microwave digestion system using a high pressure bomb and nitric acid...
Methods to determine selenium in rice collected from Nonsan-Gun, Chungpook Province by graphite furnace atomic absorption spectrometry have been studied. Samples were dissolved by a microwave digestion system using a high pressure bomb and nitric acid for sample vessel and digestion acid, respectively. The Smith-Hieftje background correction method was used for the correction of absorption intensity. The optimum analytical conditions for pretreatment of sample, and the temperatures of the graphite furnace for drying, the first pyrolysis the second pyrolysis, atomization and cleaning processes were obtained. Pd(NOs)z and Mg(N03)z were used for main and auxiliary modifiers, respectively. The correlation coefficient of the calibration curve and the limit of detection for selenium were 0.9994 and 3.2 nsi/mL, respectively.