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Electrothermal atomic absorption spectrometric determination of cadmium in environmental samples with niobium wire preconcentration method

机译:铌丝预富集电热原子吸收光谱法测定环境样品中的镉

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A preconcentration method by adsorption of cadmium on a niobium wire was developed for the environmental waters, followed by electrothermal atomic absorption spectrometry with a tungsten tube atomizer. After the preconcentration, the niobium wire was directly inserted into the tungsten tube atomizer. In the preconcentration (adsorption) process of cadmium, the optimal immersing time was 60 s. The effects of large amounts of concomitants on the preconcentration of cadmium were evaluated. When 10~3-10~4 fold excess of matrix elements existed in aqueous solution at pH 4 and 9, the cadmium response was profoundly affected by the matrix elements. However, the cadmium absorption signal was not significantly influenced at pH 7. Therefore, pH 7 was selected for the application into the real environmental samples. Under the optimal conditions, the detection limit (3S/N) for cadmium by the niobium wire preconcentration method was 7.0 pgmL~(-1) and the relative standard deviation was 6.8%. The method with preconcentration on a niobium wire was applied to the determination of cadmium in water and proved to be sensitive, simple and convenient. Because this preconcentration method can be utilized in the in situ treatment of trace cadmium in environmental water samples, it was unnecessary to carry the water samples to the analytical work place. The technique was shown to be useful for the determination of cadmium in environmental water samples at 0.1-1 μg L~(-1) levels.
机译:开发了一种针对环境水的镉吸附在铌线上的预浓缩方法,然后使用钨管雾化器进行电热原子吸收光谱法。预浓缩后,将铌丝直接插入钨管雾化器中。在镉的预浓缩(吸附)过程中,最佳浸泡时间为60 s。评估了大量伴随物对镉的预浓缩的影响。当pH 4和9的水溶液中存在10〜3-10〜4倍过量的基质元素时,镉响应会受到基质元素的深远影响。但是,在pH 7时,镉吸收信号不会受到显着影响。因此,选择了pH 7应用于实际环境样品。在最佳条件下,铌丝预富集法对镉的检出限(3S / N)为7.0 pgmL〜(-1),相对标准偏差为6.8%。铌丝预富集法用于水中镉的测定,方法灵敏,简单,方便。由于这种预浓缩方法可用于环境水样品中痕量镉的原位处理,因此无需将水样品运送到分析工作场所。结果表明该技术对测定环境水样中0.1-1μgL〜(-1)中的镉非常有用。

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