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本文研究了利用石墨炉原子发射测定痕量钾的方法。原子化温度选择2000℃,其信号-背景比最大;原子化时间采用大功率升温方式比斜坡升温信号-背景比提高一倍;选用的仪器狭缝光谱通带为0.04nm。在实验过程必须严格控制水、试剂、器皿与空气的沾污。在最佳的实验条件下,钾的检出极限(2σ)为5×10~(-13)克,相对标准偏差为1.2%。本法可应用于电子工业中所用超纯水的监测。
In this paper, graphite furnace atomic emission determination of trace potassium method. At 2000 ℃, the signal-to-background ratio was maximized. The atomization time was doubled with high-temperature heating compared with ramp heating-background ratio. The selected instrument slit passband was 0.04 nm. In the experiment process must be strictly controlled water, reagents, utensils and air pollution. Under the optimal experimental conditions, the detection limit of potassium (2σ) was 5 × 10 ~ (-13) g, the relative standard deviation was 1.2%. This Law can be applied to the monitoring of ultrapure water used in the electronics industry.