原子吸收光谱法测定乳及乳制品中铅含量的不确定度评定
1. 蒙牛乳业（沈阳）有限责任公司, 辽宁沈阳 110122
2. 内蒙古蒙牛乳业（集团）股份有限公司, 内蒙古呼和浩特 011517
| 摘 要： | 在食品安全检验中，为保证结果的准确性，应充分考虑测量不确定度带来的影响，尤其在影响检测结果判定时更为重要，本研究是建立不确定度的数学模型，对各不确定度分量进行合成和扩展，最终建立原子吸收光谱法法测定乳及乳制品中铅的不确定度评定方法。以乳为例,参考JJF1059.1-2012《测量不确定度评定与表示》，对GB5009.12-2017《食品安全国家标准食品中铅的测定》第一法石墨炉原子吸收光谱法的不确定度进行评定。乳中铅含量的加标结果为0.095 mg/kg时,测定结果的合成标准不确定度为0.0022 mg/kg,取k=2,扩展不确定度为0.005 mg/kg,其结果可表示为(0.095±0.005) mg/kg。测量结果的不确定度主要是试样检测重复性和标准溶液浓度引入的不确定度分量贡献较大。因此在实际检测工作中,通过增加标准工作液的测定次数,使用精度更高的玻璃仪器，增加平行样的测定次数等方面保证结果的准确可靠。 |
| 关 键 词： | 乳; 铅; 不确定度; 原子吸收光谱法 |
| DOI： | 10.57237/j.wjfse.2022.01.003 |
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收稿日期: 2022-08-29
接受日期: 2022-09-29
在线出版日期: 2022-11-01
Evaluation of Uncertainty in Determination of Lead in Milk and Dairy Products by Atomic Absorption Spectrometry
1. Mengniu Dairy (Shenyang) Co., LTD., Shenyang 110122, China
2. Inner Mongolia Mengniu Dairy (Group) Co., LTD., Hohhot 011517, China
| Abstract: | In the field of food safety inspection, researchers should fully consider the impact of measurement uncertainty to ensure the accuracy of the results, Especially when it affects the determination of detection results.This study is to establish the mathematical model of uncertainty, Synthesize and expand each uncertainty component .Finally, the uncertainty evaluation method for the determination of lead in milk and dairy products by atomic absorption spectrometry was established. Take milk powder as an example, the uncertainty of graphite furnace atomic absorption spectrometry method 1 in GB 5009.12-2017 National Food Aafety Standard Determination of Lead in Foods was evaluated by referring to JJF 1059.1-2012 Evaluation and Expression of Measurement Uncertainty. When the standard result of lead content in milk was 0.095 mg/kg, the synthetic standard uncertainty of the determination result was 0.0022 mg/kg, k=2, and the extended uncertainty was 0.005 mg/kg, and the result could be expressed as (0.095±0.005) mg/kg. The uncertainty of measurement results is mainly due to the uncertainty component introduced by test repeatability and standard solution concentration. Therefore, in the actual testing work, the accuracy and reliability of the results can be ensured by increasing the number of standard working fluid, using glass instruments with higher accuracy, and increasing the number of parallel samples. |
| Keywords: | Milk; Lead; Uncertainty; Atomic Absorption Spectrometry |
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