Determination of the Total Arsenic and Inorganic Arsenic in Rice

[Objective]To learn the concentration and distribution of arsenic in rice.[Methods]Hydride Generation-Atomic Fluorescence Spectrometry was adopted to determine the total arsenic and inorganic arsenic in rice;high pressure jar was used for the dissolve to determine total arsenic in rice;3 mol/L HCI was used to extract inorganic arsenic in rice;the total arsenic was determined under the condition of 3 mol/L HCI.[Results]The detection limits of total arsenic and inorganic arsenic were 0.08 ng/ml and 0.10 ng/ml respectively;the recovery rates of total arsenic and inorganic arsenic were 90.5%～103.7% and 91.6%～105.5% respectively;the RSD of them were 4.1%～6.5 % and 4.2%～6.8% respectively ;the total arsenic concentration in rice was 0.06～0.18 mg/kg and the inorganic arsenic was 0.035～0.13 mg/kg;the ratio of inorganic arsenic and total arsenic was 42.5%～88.0%.[Conclusion]The total arsenic and the inorganic arsenic can be detected in all samples,but the content of them were below the tolerance limits.