6 2 Vol. 6 No. 2 2015 2 Journal of Food Safety and Quality Feb., 2015 2012~2013 * 斯兰兰 (, 850000) 摘要 : 目的,, 方法, 9 775, 结果, 2.06%,,, 结论,, 关键词 : ; ; Monitoring and analysis of the contents of total mercury in food in Tibet area 2012~2013 SI Lan-Lan * (Tibet Autonomous Region Center for Disease Control and Prevention, Lhasa 850000, China) ABSTRACT: Objective To investigate the total mercury level in food in Tibet Autonomous Region, and put forward consumption warning, and to provide a scientific basis for market supervision. Methods Total mercury in food were measured by automatic mercury analyzer. There was no need of wet digestion or complex pretreatments of sample, and automatic direct injection. A total of 775 samples of 9 categories were randomly collected from Lhasa, Nyingchi, Lhoka, Shigatse and Ngari Prefectures. The total mercury levels in these samples were detected and analyzed. Results The contamination level of total mercury in food was low, and the unqualification rate of total mercury was only 2.06%, mainly caused by mercury pollution incident, the rest of the food was accord with national standard. The potential health risk from mercury exposure was low. Conclusion The contamination levels of total mercury in common food of Tibet Autonomous Region are generally low. The total mercury level in most food is under the limit requirements of national standards. However, food safety supervision for imported food should be further strengthened. KEY WORDS: Tibet; food; total mercury 1 引言 (Hg),,,,,, * 通讯作者 :,, E-mail: xzcdcsll@163.com *Corresponding author: SI Lan-Lan, Bachelor, Supervising Technician, Tibet Autonomous Region Center for Disease Control and Prevention, Lhasa 850000, China. E-mail: xzcdcsll@163.com
1 : 2012~2013 719 [1],, [2],,, [3],,,, 90% 100%,,, [4] (ICP-AES) (ICP-MS) (GB/T 5009.17-2003) [5],,,,,,,,, [6],,,,,,, [7],,,,,,,,,,,,, 0.01 ng, 775 2 材料与方法 2. 1 材料 775 2.2 方法 2.2.1 仪器 Milestone DMA-80, ; (Thermal Decomposition)- (Amalgamation)- (Atomic Absorption Spectrophotometry) 2.2.2 试剂汞保存液 0.05 g (GR ), 3 ml (GR ) 100 ml : 1.0 mg/ml ( ) 1.0 ng/ml 2.0 ng/ml 3.0 ng/ml 4.0 ng/ml 5.0 ng/ml 6.0 ng/ml 7.0 ng/ml 8.0 ng/ml 9.0 ng/ml 10.0 ng/ml, 2.3 检验方法 2.3.1 样品预处理,, 2.3.2 仪器条件 (Max start T)250, (purge time P)60 s, (Amalgamator heating time H )12 s, (Signal recording time R )30 s; : 4, 1 10 s, 200 ; 2 1.0 min; 3 1.5 min, 200 650 ; 4 1.5 min, 650, 1.5 min, 2.3.3 样品测定, 0.1000~0.2000 g ( 650 1 h,, ),,
720 6 (Hight)0.003,, 2.4 质量控制, : GBW08508-, 3 结果与分析 3.1 线性范围及检出限 1.0 ng 2.0 ng 3.0 ng 4.0 ng 5.0 ng 6.0 ng 7.0 ng 8.0 ng 9.0 ng 10.0 ng 6, R>0.999 11, 0.15 μg/kg 3.2 样品分析 775, 500 95 85 20 75 1 4 讨论 : (CAA) (AFS) (DSPM) [8],,, 0.01 ng, (GB/T5009.17-2003),, : 9 775, GB 2762 2012 [9] GB2762-94 [10], 2.06%, 2007-2011 ( 8.7%) [11] ; 2010 9-2011 5 357 ( 2.0%, ) [12] 3,, ( 60%, 70%) [13],,, [14],, ( ),,,,, [15],,,,, 2009 ( 36~280 μg/kg) [16] ( 12.7~68 μg/kg) [17] Table 1 表 1 各类食品总汞含量检测结果 The detection results of total mercury contents of all types of food ( ) (µg/kg ) (µg/kg) (µg/kg) % 171 0.15 35 2.96 10 3 1.75 50 5.3 92.5 13.16 100 0 0 79 <0.15 17.5 0.97 20 0 0 163 0.39 3.9 1.35 20 0 0 61 1.0 10.2 2.93 --- 0 0 86 <0.15 50 0.42 10 1 1.16 20 6.4 66.9 25.72 300 0 0 35 3.8 150 16.21 --- -- --- 10 <0.15 1.8 0.08 1 1 10 100 <0.15 660 24.18 20 11 11 775 <0.15 660 6.68 -- 16 2.06
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