ICP-MS Determination of Aluminum in Wheaten Food with Microwave Assisted Sample Digestion

The powdered and homogenized sample(0.200 0-0.500 0 g) was digested with 6 mL of HNO3 and 2 mL of H2O2 in the microwave digestor under pre-set program.The solution obtained was evaporated to ca.1 mL and made up to 50 mL with water,which was used for ICP-MS determination for its Al-content.Scandium was chosen as the internal standard and the method of external standard curve was used for quantification.Linearity range of mass concentration of Al was found within 0.3 mg·L-1.Detection limit(3S/N) of the method found was 0.061 μg·L-1.Recovery of the method was tested by addition of Al(Ⅲ) standard solution at 3 concentration levels,giving results of recovery in the range of 94.0%-101%,and values of RSD′s(n=6) in the range of 1.4%-2.1%.Two samples of CRM′s(GBW 10010 and GBW 10011) were analyzed by the proposed method for their Al-contents,the results obtained were in consistency with the certified values.