2006年美国perkinelmer公司原子吸收高级培训班温州-仪器信息网.pdf

2006 年美国PerkinElmer 公司原子吸收 高级培训班（温州雁荡山）论文集 2006 年美国 PerkinElmer 公司原子吸收高级培训班论文集 Cr(TTA)3 挥发-石墨炉原子吸收光谱法直接测定鸡蛋中六价铬 肖亚兵，高健会，许泓，郑文杰 （天津出入境检验检疫局，天津300201 ） 摘 要: 基于 Cr(Ⅲ)与噻吩甲酰三氟丙酮（TTA ）生成的络合物在石墨炉中的挥发性，建立了 一种前处理简单、灵敏度高的测定鸡蛋中六价铬的分析方法。研究了鸡蛋样品的消化方式、 Cr(Ⅲ)与 TTA 络合的反应酸度、各种试剂的加入量、超声波水浴的温度和时间、静置时间等条 件，并对石墨炉挥发 Cr(Ⅲ) 的原子化条件进行了探讨。测试液中Cr(Ⅵ)浓度在 0.001~0.010mg/L 内呈良好线性关系，线性回归系数为0.9997 。鸡蛋样品中Cr(Ⅵ)不同加入量的平均回收率在 75%~96% ；相对标准偏差在3.5%~11.5% ；最低定量限为0.3 µg/L 。 关键词: 六价铬；Cr （TTA ） 挥发；原子吸收光谱法；鸡蛋 3 Volatilization of Cr(TTA) -Direct Speciation Determination of Cr(Ⅵ) 3 in Eggs by Graphite Furnace Atomic Absorption Spectrometry XIAO Ya-bing, GAO Jian-hui ，XU Hong, ZHENG Wen-jie （Tianjin Entry-Exit Inspection and Quarantine Bureau, Tianjin 300201, China ） Abstract ：A novel and highly sensitive determination method of Cr(Ⅵ) in eggs has been described based on the formation of a volatile complex Cr(Ⅲ) and thnoyltrifluroacetone. In this paper, the manner of sample digestion ，the reaction conditions of Cr(TTA)3 complex, such as the acidity, sonication time and temperature, the amount of reagent added and the time required for the complexation reaction have been investigated. The atomization conditions to volatilize Cr(Ⅲ) in graphite furnace are discussed. The calibration coefficient exceeds 0.9997 and the dynamic linear range is 0.001~0.010mg/L. The average recoveries of Cr(Ⅵ) in eggs ranged 75% to 96% with the relative standard deviations between 3.5% and 11.5%, the limit of quantification(LOQ) is 0.3 µg/L. Key words: Cr(Ⅵ); volatilization of Cr(TTA)3; atomic absorption spectrometry; eggs 食品中的微量元素与人体健康密切相关。研究表明，三价铬的