Comenius University in Bratislava, Faculty of Natural Sciences, Department of Analytical Chemistry, Mlynská dolina CH-2, 842 15 Bratislava, Slovak Republic.
Food Chem. 2012 May 1;132(1):554-60. doi: 10.1016/j.foodchem.2011.10.068. Epub 2011 Oct 30.
In this work, the capability of different chemical modifiers (Pd, Pd/Mg(NO3)2, Pd/NH4NO3, NH4H2PO4, NH4H2PO4/Mg(NO3)2) to eliminate the matrix effects in the direct determination of Cd, Cu and Zn in food-stuffs by solid sampling-electrothermal atomic absorption spectrometry was compared. The alternative analytical lines were used for determination of Cu (327.4nm) and Zn (307.6nm) in order to allow the introduction of reasonably high sample mass into the furnace. Mixed modifiers containing palladium were useful to eliminate the matrix effect in Cd determination. For Cu and Zn determination the application of Pd shows satisfactory analytical performance. In the determinations of Cd and Zn the phosphate containing modifiers shows elimination of matrix effects only when applying them to a partially pyrolysed sample (at 400°C). The achievable limits of detection for Cd, Cu and Zn in solid samples were 0.279ngg(-1); 0.020μgg(-1) and 2.04μgg(-1), respectively.
在这项工作中，比较了不同化学修饰剂（Pd、Pd/Mg(NO3)2、Pd/NH4NO3、NH4H2PO4、NH4H2PO4/Mg(NO3)2）在采用固体进样-电热原子吸收光谱法直接测定食品中 Cd、Cu 和 Zn 时消除基体效应的能力。为了能够将较大的样品量引入到炉子中，选用了用于测定 Cu（327.4nm）和 Zn（307.6nm）的替代分析线。含有钯的混合修饰剂可用于消除 Cd 测定中的基体效应。对于 Cu 和 Zn 的测定，钯的应用显示出令人满意的分析性能。在 Cd 和 Zn 的测定中，仅当将含磷修饰剂应用于部分热解的样品（在 400°C 时）时，才能消除基体效应。在固体样品中，Cd、Cu 和 Zn 的可达到的检出限分别为 0.279ngg(-1)；0.020μgg(-1)和 2.04μgg(-1)。
