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随着电厂机组容量和参数的不断上升,对热力系统的水汽品质提出了更高的监督要求,许多项目的控制指标已降到5～10μg/L,有些甚至更低。由于水汽品质的提高,水中待监测离子的浓度也处于痕量级,要快速准确获取分析数据必需有更好的方法。对水中铜、铁离子浓度的检测,目前电厂普遍应用的是分光光度法,但由于其测量范围为:铁5～200μg/L,铜10～200μg/L,且操作过程繁琐,单个样品的分析需耗时1～2h,显然与快速准确的测定要求有一定距离。应用原子吸收法测定水中铜、铁离子的浓度,既能使分析数据在准确性和可靠性上有很大提高,无焰原子吸收法可测到10-13g/mL-1即10-4μg/L的数量级,还能使单个样品的分析时间缩短至3～5min,极大地提高了检测效率。
With the increasing unit capacity and parameters of power plants, higher requirements for monitoring the water vapor quality of the thermal system have been put forward. The control targets of many projects have dropped to 5 ~ 10 μg / L, some even lower. Due to the improvement of water vapor quality, the concentration of ions in water to be monitored is also on the order of magnitude, and a better method is necessary to obtain the analysis data quickly and accurately. At present, the spectrophotometric method is widely used in power plant because of its measuring range of 5 ~ 200μg / L for iron and 10 ~ 200μg / L for copper, and the operation is cumbersome. The analysis of single samples Takes about 1 ~ 2h, apparently with a fast and accurate determination of a certain distance. The determination of copper and iron ion concentration in water by atomic absorption spectrometry not only can greatly improve the accuracy and reliability of the analytical data, but also can detect 10-13g / mL-1, 10-4μg / L orders of magnitude, but also to make a single sample analysis time is shortened to 3 ~ 5min, greatly improving the detection efficiency.