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使用石墨炉作超痕量分析时常遇到样品基体的干扰。将样品直接置于石墨管壁时,原子化发生在一个温度分布不均匀的加热环境中,它不具有抗干扰能力。L’vov 及其他一些作者发现,如果将样品置于石墨管内的一薄片石墨平台上,则会有较大的抗干扰能力。我们对这种石墨平台技术进行了研究。为准确地记录下原子化波峰形状及波峰的出现时间,使用了高速数据收集装置和图象显示装置。通过测定几种 NBS 标准样品中的Cd 和 Pb,研究了干扰情况。有时在使用峰高测量方式时遇到的干扰影响很强,但在改用峰面积测量方式时会变得很弱。试验结果表明,测定易挥发元素时石墨平台法能够有效地消除干扰影响。
The use of graphite furnace for ultra-trace analysis of the sample matrix often encounter interference. When the sample is placed directly on the graphite tube wall, the atomization takes place in a non-uniform heating environment and it does not have the anti-interference ability. L’vov and others have found that there is greater resistance to interference if the sample is placed on a thin graphite platform in a graphite tube. We studied this graphite platform technology. In order to accurately record the atomization peak shape and the peak appearance time, a high-speed data acquisition device and an image display device were used. The interference was investigated by measuring Cd and Pb in several NBS standard samples. Interference that is sometimes encountered when using peak height measurements can be very powerful, but can become weak when using peak area measurements. The experimental results show that the graphite platform method can effectively eliminate the influence of interference when measuring volatile elements.