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原子吸收法测定痕量贵金属,目前多采用电热石墨炉作为原子化器进行工作。贵金属原子化时碳还原气氛的存在,可以获得较高的灵敏度。HGA—500型石墨炉电源设置有最大功率(0秒)升温(2000℃/秒)和≥1秒升温装置。当采用最大功率升温时(与1秒升温比),原子化时间可缩短、灵敏度有较大的提高,许多元素原子化温度可降低数百度,有的降低近千度。原子化时温度的降低和时间的缩短,大大延长了石墨管的使用寿命。采用最大功率升温可以减少干扰。而采用1秒升温时,除AgAu≥2700℃时产生原子化温度平台外,其余六个铂族元素均不出现原子化温度平台,故为了获得灵敏度高、稳定性好,在实际测试时,采用最大功率升温为好。
Atomic absorption method for the determination of trace precious metals, the current use of electric graphite furnace as the atomizer to work. Precious metal atomization of the presence of carbon reduction atmosphere, you can get a higher sensitivity. HGA-500-type graphite furnace power supply set the maximum power (0 seconds) heating (2000 ℃ / sec) and ≥ 1 second heating device. When using the maximum power heating (with 1 second heating ratio), the atomization time can be shortened, the sensitivity has been greatly improved, many elements of the atomization temperature can reduce the number of Baidu, and some reduce nearly a thousand degrees. Atomic temperature reduction and time reduction, greatly extending the life of graphite tube. Using maximum power heating can reduce interference. However, when the temperature is raised for 1 second, the atomization temperature platform is generated when AgAu≥2700 ° C., and the other six platinum group elements do not have the atomization temperature platform. Therefore, in order to obtain high sensitivity and good stability, in the actual test, The maximum power heating is good.