Other operations. The operation procedures such as standard addition method and output are also like the same as atomic absorption spectrometry. Graphite furnace atomic absorption spectrometry is the most sensitive method in the three methods of atomic absorption spectrometry. And it’s the most complicated method in the three methods with much more technology and operation requirements. Not only the measurement elements are extended, but also the measurement range of concentration is enlarged, so that the trace and ultra-trace measurements from 0.01 pg to1000 pg are available. Compared with other two methods, graphite furnace atomic absorption spectrometer is much too expensive, it needs more consumptive material, and it costs much long time and much more energy. For the method covers a broad area, and some is still in further studying, and it requires advanced technology theory and well operation skills. So, flame atomic absorption spectrometry or hydride generation atomic absorption spectrometry is suggested for first consideration unless graphite furnace atomic absorption spectrometry is necessary to be chosen. However, the technology of graphite furnace is developed much more in recent years, more questions are solved excepting a long time cost and high cost for a sample measurement, and it is accepted by more users. Especially for trace and ultra-trace analysis, furnace atomic absorption spectrometry is one of the most important analyzing methods. For the graphite furnace atomic absorption spectrometry can analyze trace and ultra-trace samples with the content between 0.01-1000 pg, there are many factors influencing the analysis. Besides the installation requirements described in chapter 2, following conditions also should be considered:
