Abstract:The contents of lead, cadmium and chromium were determined for 22 kinds of foods including cereals, vegetables, beverage, sea foods and dairy products by using high resolution continuum source graphite furnace atomic absorption spectrometry (HR-CS GFAAS). The methods for sample preparation, digestion, and quantitative analysis were established, by which satisfying analytical precision (RSD=1.3%~4.9%) and recovery (95.1%~104.6%) were achieved. The results indicated that the contents of lead in tea leaves and chromium in shellfish were much higher than those in the other foods; the contents of cadmium in millet, leek and shellfish were relatively higher than the others. This work established reliable methods for quantitative analysis of heavy metals in foods, which provided experimental references for the constitution of food quality and safety standards. Meanwhile, the distributions of heavy metals in foods given by this work can be expected to enhance the consumers’ consciousness of food safety.
[1] ZHANG Hai-feng, LU Hong-mei, LU Xin-guo(章海风, 陆红梅, 路新国). Food and Nutrition in China(中国食物与营养), 2010, 8: 17. [2] Rezende H C, Nascentes C C, Coelho N M M. Microchem. J., 2011, 97(2): 118. [3] Davis A C, Wu P, Zhang X F, et al. Appl. Spectrosc. Rev., 2006, 41(1): 35. [4] Slavica R S D. Chemosphere, 2010, 78(4): 451. [5] Kyun G L, Yong K S, Jin S L, et al. T. Nonferr. Metal Soc., 2011, 21: 160. [6] Zhou Q X, Zhao N, Xie G H. J. Hazard Mater., 2011, 189(1-2): 343. [7] Sharma S, Prasad F M. E-J. Chem., 2010, 7(4): 1174. [8] Bilandzic N, Dokic M, Sedak M. Food Chem., 2011, 124(3): 1005. [9] Strady E, Schafer J, Baudrimont M, et al. Ecotox Environ. Safe, 2011, 74: 600. [10] Grembecka M, Malinowska E, Szefer P. Sci. Total Environ., 2007, 383(1-3): 59. [11] Qin L Q, Wang X P, Li W, et al. J. Health Science, 2009, 55(2): 300. [12] Nunes L S, Barbosa J T P, Fernandes A P, et al. Food Chem., 2011, 127(2): 780. [13] dos Santos L M G, Araujo R G O, Welz B, et al. Talanta, 2009, 78(2): 577. [14] GB/T 5009.12—2003. Determination of Lead in Foods(食品中铅的测定). National Standards of the People’s Republic of China(中华人民共和国国家标准). [15] GB/T 5009.15—2003. Determination of cadimium in Foods(食品中镉的测定). National Standards of the People’s Republic of China(中华人民共和国国家标准). [16] GB/T 5009.123—2003. Determination of Chromium in Foods(食品中铬的测定). National Standards of the People’s Republic of China(中华人民共和国国家标准). [17] REN Ting, ZHAO Li-jiao, ZHONG Ru-gang(任 婷, 赵丽娇, 钟儒刚). Spectroscopy and Spectral Analysis (光谱学与光谱分析), 2011, 31(12): 3388. [18] Gunduz S, Akman S, Baysal A, et al. Spectrochim. Acta B, 2010, 65: 297. [19] XIAO Xin-feng, DUAN Xi-qiang(肖新峰, 段夕强). Chemical Research and Application(化学研究与应用), 2010, 22(11): 1459. [20] YANG Xiu-fang, XU Ling, XU Jian-feng, et al(杨秀芳, 许 凌, 徐建峰, 等). Food Science(食品科学), 2011, 32(18): 218. [21] GB 2762—2005. Maximum Levels of Contaminants in Foods(食品中污染物限量). National Standards of the People’s Republic of China(中华人民共和国国家标准). [22] Codex Standard 193—1995(Amended 2010). Codex General Standard for Contaminants and Toxins in Food and Feed. Codex Alimentarius Commission. [23] Commission regulation (EC) No 629/2008. Amending Regulation (EC) No 1881/2006 Setting Maximum Levels for Certain Contaminants in Foodstuffs. Official Journal of the European Union., 2008, L 173/6.