Determination of Aluminum in Foods by ICP-AES

Inductively coupled plasma atomic emission spectrometry(ICP-AES) method was used to determine aluminum(Al) in foods during which the samples were digested by using nitric acid-perchloric acid.The results showed that the digestion solution could be directly diluted with water until the needed volume;when the Al concentration was in the range of 0~6 mg/L,the correlation coefficient R2 = 0.9996,better than the colorimetric method of national standard(R2 = 0.981 for 0~3μg);detection limit of this method was 0.15 mg/kg,much better than the colorimetric method of national standard(12.5 mg/kg);when comparison was conducted with the same sample,for this method the RSD% was 5.8%,while only 10% for the colorimetric method of national standard;for this method the recoveries were 92%~97%,and the measured values of reference materials for GBW10016 tea were also within the acceptable range.