用标准加入石墨原子化法测定铝合金电解着色膜中的铜、镍、锡

Determination of Several Metal Elements in Electrolytic Coloring Anodizing Coating on Aluminum Alloy by Graphite Furnace Atomic Absorption Spectrometry

为了提高铝阳极氧化电解着色膜中铜、镍、锡元素的测试准确性,将标准加入法运用于石墨原子化(GFAAS)中,可有效地抑制共存物的干扰。采用标准曲线法初步确定线性区间,然后确定样品试液的最佳稀释倍数、最佳标准加入系列溶液,最终确定具有较好线性关系的铜、镍、锡标准加入的线性区间(分别为0～0.6mg/L、0～0.8mg/L和0～0.7mg/L)。结果表明,在铜、镍、锡共存体中,镍含量的增加可降低铜、锡元素的标准加入校准曲线的线性相关系数。对于成分复杂的样品,标准加入法具有更高的准确性。

Standard addition calibration technique was used in the graphite furnace atomic absorption spectrometric (GFAAS) analysis of copper, nickel, and tin in the electrolytic coloring anodizing coating on aluminum so as to effectively reduce interference of the coexistent elements in the sample solution and increase the measurement accuracy. Thus the linear range was preliminarily determined using standard curve method, then the optimal dilution times for the solutions to be tested and a series of working solutions were determined, which made it possible to accordingly determine the linear ranges with higher correlation coefficients for copper, nickel and tin (0~0.6 mg/L Cu, 0~0.8 mg/L Ni, and 0~0.7 mg/L Sn, respectively, with respect to standard addition calibrating curves). It was found that the increase in the nickel content of the Cu-Ni-Sn ternary system led to decrease in the linear correlation coefficients of copper and tin in the standard addition calibrating curves.