多工作曲线-全谱交直流电弧发射光谱法测定地质样品中的铅含量

在分析仪器测定中,当元素含量变化较大时,部分低含量和高含量的样品很难得到理想的测定结果。通过使用多条工作曲线来扩大元素测定的动态范围,对地质样品中不同含量的铅进行了测定,结果表明,方法的相对标准偏差均小于10%,用多工作曲线法测得的铅含量与推荐值更接近。待测样品含量首先由第一条灵敏度高的曲线进行测定,若测定浓度大于该曲线的转换值,则由第二条灵敏度较低的工作曲线进行测定。转换值的设定要充分考虑工作曲线的衔接问题,设定的转换值浓度应该在衔接的两条工作曲线上都处于线性部分。使用多工作曲线法,设定合理的转换值,可以同时获得高、低含量样品的理想测定结果。

A Multi - Calibration Curve - Full Spectrum ac/dc Arc Emission Spectrometry was Used to Determine the Plumbum Content in Geological Samples.

Instrument analysis, when the element content changes greatly, part of the low content and high content of sample is hard to get ideal results. Through the use of multiple calibration curve to enlarge the dynamic range of element measurement. On the AES-8000 full spectrum ac/dc arc emission spectrometer, using this method to test the different content of plumbum elements in the geological samples, and the results show that the measured Plumbum content is closer to the recommended value, i.e. the accuracy is better. In order to broaden the dynamic range, the sample is measured by the first curve of high sensitivity, if the concentration is greater than the conversion value, measured by the second curve of low sensitivity. Cohesion between two curves should be fully considered, the conversion value should be in the linear part of the two curves. Using multiple calibration curve method, setting reasonable conversion value, the high and low content of samples of ideal test results can be obtained at the same time.