石墨炉原子吸收光谱法测定普洱茶包装用棉纸中铅含量不确定度的评定
石墨炉原子吸收光谱法测定普洱茶包装用棉纸中铅含量不确定度的评定
目的评定石墨炉原子吸收光谱法测定普洱茶包装用棉纸中铅含量的不确定度。方法采用石墨炉原子吸收光谱法对普洱茶包装用棉纸中的铅含量进行检测, 参照CNAS-GL 06:2018评定其不确定度。结果其合成标准不确定度为0.0435 mg/kg。GB 4806.8-2016《食品安全国家标准 食品接触用纸和纸板材料及制品》中规定铅的残留量不大于3.0 mg/kg, 本次测试结果表示为(0.66±0.09) mg/kg, k=2, 结果判定为符合。结论其不确定度主要来自于标准曲线的拟合, 其次是铅标准中间液的配制及样品的重复性测量。
ObjectiveTo evaluate the uncertainty for determination of lead content in cotton paper for Pu'er tea packaging by graphite furnace atomic absorption spectrometry. MethodsGraphite furnace atomic absorption spectrometry was used to detect the lead content in cotton paper for Pu'er tea packaging and evaluate its uncertainty according to CNAS-GL 06:2018. ResultsThe synthetic standard uncertainty was 0.0435 mg/kg. According to GB 4806.8-2016 National Food Safety Standard Paper and Paperboard Materials and Products for Food Contact, the residual amount of lead was not more than 3.0 mg/kg. The test result was expressed as (0.66±0.09) mg/kg, k=2, and the result was determined to be consistent. ConclusionThe uncertainty mainly comes from the fitting of the standard curve, followed by the preparation of the lead standard intermediate solution and the repeatability measurement of the sample.
标题：石墨炉原子吸收光谱法测定普洱茶包装用棉纸中铅含量不确定度的评定
英文标题：Uncertainty evaluation for the determination of lead content in cotton paper for Pu’er tea packaging by graphite furnace atomic absorption spectrometry
作者：
陈诚 云南省产品质量监督检验研究院
向文娟 云南省产品质量监督检验研究院
陈红 云南省产品质量监督检验研究院
中文关键词:石墨炉原子吸收光谱法,棉纸,铅,不确定度,
英文关键词:graphite furnace atomic absorption spectroscopy,cotton paper,lead,uncertainty,
发表日期：2020-03-20
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