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用通常的原子吸收法测定砷和锑灵敏度较低。作者用石墨炉无焰原子吸收法直接测定河水和工业废水中微量砷和锑,得到了满意的结果,方法如下。取20微升试样注入原子化器中,按下表所示条件依次干燥、灰化、原子化。测定时原子化器中以2.0升/分流速通入氩气,在193.7 nm测定砷的吸收值,在217.5 nm测定锑的吸收值。由校准曲线分别求得砷和锑的含量。作背景补偿时,砷用氘灯在192.7 nm测定吸收值,锑在215.2 nm非共振线测定吸收值;再与共振线吸收值的差值进行校正。
Determination of arsenic and antimony by conventional atomic absorption method has low sensitivity. The authors used graphite furnace flameless atomic absorption spectrometry for the direct determination of arsenic and antimony in river water and industrial wastewaters, and obtained satisfactory results as follows. Take 20 μl sample into the atomizer, according to the conditions shown in the table below, followed by drying, ashing, atomization. Argon gas was purged with argon gas at a rate of 2.0 liters / minute, the absorbance of arsenic was measured at 193.7 nm, and the absorbance of antimony was measured at 217.5 nm. The arsenic and antimony contents were obtained respectively from the calibration curves. As a background compensation, arsenic deuterium lamp at 192.7 nm determination of absorption, antimony at 215.2 nm non-resonance line absorption measured value, and then the resonance line absorption value of the difference correction.