Determination of Cadmium in Tea-Camellia Seed Oil by Wet Digestion-Graphite Furnace Atomic Absorption Spectrometry
Received:June 15, 2011  Revised:July 05, 2011
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DOI:10.3969/j.issn.2095-1035.2011.03.0016
KeyWord:tea-camellia seed oil;cadmium;wet digestion;graphite furnace atomic absorption spectrometry (GFAAS)
              
AuthorInstitution
NI Zhanglin 中国林业科学研究院亚热带林业研究所 国家林业局经济林产品质量检验检测中心杭州 ,浙江 富阳
QU Minghua 中国林业科学研究院亚热带林业研究所 国家林业局经济林产品质量检验检测中心杭州 ,浙江 富阳
TANG Fubin 中国林业科学研究院亚热带林业研究所 国家林业局经济林产品质量检验检测中心杭州 ,浙江 富阳
SHEN Danyu 中国林业科学研究院亚热带林业研究所 国家林业局经济林产品质量检验检测中心杭州 ,浙江 富阳
MO Runhong 中国林业科学研究院亚热带林业研究所 国家林业局经济林产品质量检验检测中心杭州 ,浙江 富阳
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Abstract:
      Although there is a clear definition for the threshold limit of lead (Pb) and arsenic(As) in vegetable oil which is <0.1mg/kg in GB2716-2005,no threshold limit for cadmium was given in this standard. In this study, tea-camellia seed oil which is popularly studied was chosen and investigated. A new method using wet digestion-graphite furnace atomic absorption spectrometry was established in which HNO3 and H2O2 is used as the acidic system. The content of cadmium in the crude and refined tea-camellia seed oil were determined by the method. The results matched with those for other plant oils reported previously. The detection limit, RSD and recovery rate of this method is 0.058μg/L, 12%, and in the range of 84%-103%, respectively. Thus it concluded that this method is reliable and has high sensitivity.
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