A procedure using ICP OES for sample preparation for the determination of copper, iron and manganese in cashew nuts was developed. Constrained simplex-centroid design was applied in the optimization of the digestion in microwave oven procedure, and the results evaluated from topological maps of the Kohonen network. The best proportion evaluated for the digestion of the sample with HNO₃, H₂O₂ and H₂O was 10:45:45 (%). With optimized conditions, the detection limits were 0.63, 4.3 and 0.37 mg kg⁻¹, and quantification 2.1, 14 and 1.2 mg kg⁻¹ for Cu, Fe and Mg, respectively. The precision (% RSD) was 1.84, 2.31 and 2.73, for Cu, Fe and Mg, respectively. The procedure proposed had the accuracy confirmed using NIST 1568b (at 95% reliability) and was applied in the samples obtaining concentrations in the range of 10.7–19.4, 44.3–67.2 and 11.0–21.4 mg kg⁻¹ for Cu, Fe and Mg, respectively.

开发了一种使用ICP OES进行样品制备的方法，该方法用于测定腰果中的铜，铁和锰。将约束的单纯形质心设计应用于优化微波炉程序中的消化，并根据Kohonen网络的拓扑图对结果进行评估。对于用HNO ₃，H ₂ O ₂和H ₂ O消化样品评估的最佳比例为10:45:45（％）。在最佳条件下，检出限为0.63、4.3和0.37 mg kg ^-1，定量为2.1、14和1.2 mg kg ^-1分别用于铜，铁和镁。Cu，Fe和Mg的精度（％RSD）分别为1.84、2.31和2.73。所建议的程序具有使用NIST 1568b所确认的准确性（在95％的可靠性下），并应用于样品中的铜，铁和镁的浓度范围为10.7-1.9.4、44.3-67.2和11.0-21.4 mg kg ^-1，分别。