Background Color additives requiring batch certification by the U.S. Food and Drug Administration have Code of Federal Regulations (CFR) specification limits for certain elements and are usually analyzed by X-ray fluorescence spectrometry (XRF). However, sensitivity for Hg is too low in some color additives. Objective The thermal decomposition amalgamation (TDA)-atomic absorption spectrometric (AAS) technique was investigated for providing quick and accurate determinations of Hg in certifiable color additives. Methods Tests were performed to optimize conditions and test reliability of Hg determinations at and below the CFR specification limit of 1 mg/kg. Results Sensitivity is much improved over XRF, with limits of quantitation of 0.03 mg/kg for highly homogeneous color additives. Conclusion The TDA-AAS method can be used for determining Hg concentrations at and below the CFR specification limit. The technique is effective for all color additives, including those that are difficult to analyze by XRF, but less efficient for color additives that quickly deteriorate the catalyst. Regular quality checks using certified reference materials and in-house matrix-matched check standards are essential. Highlights The TDA-AAS method is applicable for use in routine color additive batch certification. Certain matrixes (notably those that release nitrogen or sulfur oxides or halogens upon combustion) necessitate more frequent replacement of the catalyst and recalibration, impacting productivity. Color additives containing BaSO4, in color additive lakes, that are difficult to analyze by other techniques, are well suited for TDA-AAS analysis.

中文翻译：

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使用热分解汞齐和原子吸收光谱分析法测定可认证颜色添加剂中的汞

背景 需要美国食品和药物管理局批次认证的颜色添加剂对某些元素具有联邦法规 (CFR) 规范限制，通常通过 X 射线荧光光谱法 (XRF) 进行分析。但是，某些颜色添加剂对汞的敏感性太低。目的研究热分解汞齐（TDA）-原子吸收光谱（AAS）技术，以快速准确地测定可认证颜色添加剂中的汞含量。方法 进行测试以优化 Hg 测定的条件和测试可靠性，在 CFR 规范限制 1 mg/kg 及以下。结果 与 XRF 相比，灵敏度大大提高，高度均一的颜色添加剂的定量限为 0.03 mg/kg。结论 TDA-AAS 方法可用于测定 CFR 规范限值及以下的 Hg 浓度。该技术对所有颜色添加剂都有效，包括那些难以通过 XRF 分析的颜色添加剂，但对于快速劣化催化剂的颜色添加剂效率较低。使用经认证的参考材料和内部基质匹配的检查标准进行定期质量检查是必不可少的。亮点 TDA-AAS 方法适用于常规颜色添加剂批次认证。某些基质（特别是那些在燃烧时释放氮或硫氧化物或卤素的基质）需要更频繁地更换催化剂和重新校准，从而影响生产率。在颜色添加剂色淀中含有 BaSO4 的颜色添加剂，其他技术难以分析，