茶粉中锡能力验证样品制备及其定值分析

Preparation and Certified Value Analysis of Tin Proficiency Testing Samples in Tea Powder

摘要: 采用空白红茶粉基质中加入不同浓度锡的方式自主研制质控样品，依据CNAS-GL003:2018《能力验证样品均匀性和稳定性评价指南》，按照GB 5009.16-2023《食品安全国家标准食品中锡的测定》电感耦合等离子体发射光谱法对能力验证样品的均匀性和稳定性进行评价，并通过实验数据汇总确定能力验证样品的参考值范围。结果表明自主研制的2种浓度质控样均匀性良好，在常温下储存70 d及运输前后稳定性良好。2个浓度的能力验证样品最终参考结果为29.1 mg/kg，53.5 mg/kg。通过本方法制得的能力验证样品可适用于日常工作的质量控制、能力验证、盲样考核等领域，且制备方式具有可复制性。

Abstract: Quality control samples were independently developed by adding tin at different concentrations to a blank black tea powder matrix. The homogeneity and stability of the proficiency testing samples were evaluated in accordance with CNAS-GL003:2018 Guidelines for the Evaluation of Homogeneity and Stability of Proficiency Testing Samples and using the inductively coupled plasma optical emission spectrometry specified in GB 5009.16-2023 National Food Safety Standard—Determination of Tin in Foods. The reference value ranges of the proficiency testing samples were determined by summarizing the experimental data. The results showed that the two self-developed quality control samples with different concentrations had good homogeneity, and maintained good stability after 70 days of storage at room temperature as well as before and after transportation. The final reference results for the two concentrations of proficiency testing samples were 29.1 mg/kg and 53.5 mg/kg, respectively. The proficiency testing samples prepared by this method can be applied in fields such as daily quality control, proficiency testing, and blind sample assessment, and the preparation method is replicable.