FOOD SCIENCE ›› 2013, Vol. 34 ›› Issue (8): 168-171.doi: 10.7506/spkx1002-6630-201308035

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Determination of Cadmium, Copper, Lead and Zinc in Grains by Ultrasound-Assisted Extraction Followed by Atomic Absorption Spectrometry

GU Jia-li,ZHAO Gang,MA Zhan-ling   

  1. College of Chemistry, Chemical Engineering and Food Safety, Bohai University, Jinzhou 121013, China
  • Received:2011-12-19 Revised:2013-03-08 Online:2013-04-25 Published:2013-05-07

Abstract: Determining of cadmium, copper, lead and zinc in grain using ultrasound-assisted extraction- atomic absorption spectrometry was optimized. The results indicated that 0.1 g of grain samples were treated with 5 mL of HNO3-H2O2 (2:1, V/V) followed by 10-min presonication and then transferred to ultrasound water bath (60 ℃) for 10 min. Cd, Cu, Pb, and Zn can be quantitatively recovered and the spiked recoveries ranged within 96.0%–107.5%. The results of t-test indicated that difference in the results from ultrasound-assisted extraction and conventional wet acid digestion was not significant. The relative standard deviations (RSD) were 4.9%–7.0%, the limits of detection were 0.007–0.019 mg/L.

Key words: ultrasound-assisted extraction, metallic elements, grain

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