Investigation of Heavy Metal Contents by Milling Degrees of Rice
2015
Kim, J.K., National Agricultural Products Quality Management Service, Daejeon, Republic of Korea | Lee, J.H., National Agricultural Products Quality Management Service, Daejeon, Republic of Korea | Kim, J.E., National Agricultural Products Quality Management Service, Daejeon, Republic of Korea | Bae, I.A., National Agricultural Products Quality Management Service, Daejeon, Republic of Korea | Kim, K.S., National Agricultural Products Quality Management Service, Daejeon, Republic of Korea | Lee, E.S., National Agricultural Products Quality Management Service, Daejeon, Republic of Korea | Kwon, S.D., National Agricultural Products Quality Management Service, Daejeon, Republic of Korea | Park, J.H., National Agricultural Products Quality Management Service, Daejeon, Republic of Korea | Lee, K.S., Chungnam National University, Daejeon, Republic of Korea
BACKGROUND: Recently, various rice by milling degree is sold for health and taste. To provide safe food to consumers, it is need to know the change of heavy metal contents according to milling degree of rice. METHODS AND RESULTS: This study was to investigate residual the levels of cadmium (Cd), lead (Pb), copper (Cu) and zinc (Zn) as stated in the milling degree of the rice contaminated Cd and Pb from 2011 to 2012 in Chungcheongnam-do. Rice samples exceeded the maximum residue limits (MRL) of Cd and Pb were milled by five degrees (0.0, 2.45, 8.02, 10.48, 15.09%). Milled rice was digested by microwave method, and analyzed heavy metal contents using ICP-OES. Recovery ratios of 4 heavy metals such as Cd, Pb, Cu and Zn were ranged for 79.7-98.9%, and limits of detection (LOD) and limits of quantitation (LOQ) were fulfilled with the normal analytical standards. Concentrations of Cd, Pb, Cu and Zn were ranged 0.416- 0.433 mg/kg, 0.183-0.26 mg/kg, 3.639- 3.882 mg/kg and 16.868-19.801 mg/kg, respectively. CONCLUSION: From these results, conforming with increase of milling degree of rice, Cd, Pb, Cu, and Zn contents tended to decrease. The contents of heavy metals were decreased 3.1% in Cd, 29.3% in Pb, 6.4% in Cu and 15.1% in Zn, in according to the highest milling degree of 15.09%.
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