Heavy Metals in Sangyod Rice Samples Cultivated in Phatthalung, Thailand
Keywords:Heavy metal, Sangyod rice, Dietary intake, Food safety
Sangyod rice is a traditional rice variety grown in Phatthalung province in the southern part of Thailand for more than a hundred years. In this study, inductively coupled plasma mass spectrometry (ICP-MS) was used to determine the heavy metals (As, Cd, Cu, Mn and Zn) in Sangyod rice samples collected from six districts in Phatthalung. The highest mean concentrations of As and Mn were observed for rice samples from Si Banphot. Cd was highest in sample from Kong Ra and lowest in sample from Si Banphot. Bang Kaeo showed the highest content of Cu. Mueang had the greatest Zn concentration and lowest Cu level. The estimated daily intake of heavy metals resulting from rice consumption was 0.019–0.045 mg As day-1, 0.003–0.013 mg Cd day-1, 0.15–0.37 mg Cu day-1, 2.94–3.75 mg Mn day-1 and 5.12–5.88 mg Zn day-1, respectively. The percentage contribution to Provisional Tolerable Weekly Intake (PTWI) values of As and Cd for male was 12.9–30.3% and 4.7–18.4%, respectively, and for female was 15.6–36.7% and 5.7–22.3%, respectively. The obtained results showed all Sangyod rice samples from this study had the dietary intake of As and Cd lower than the PTWI values.
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