原子吸收光谱法测定火电厂水汽中钾钠钙

Determination of potassium,sodium and calcium in aqueous vapor from power plant by atomic absorption spectrometry

采用空气-乙炔火焰原子吸收光谱法对火电厂水汽中钾、钠、钙元素进行了测定。对测定介质、释放剂的影响进行了探讨,结果表明:以体积分数为1%的盐酸作为测定介质,选择质量浓度为100 g/L的SrCl_2溶液作为释放剂。方法测定的线性范围分别是钾:0.01～2.00μg/mL,钠:0.01～1.00μg/mL,钙:0.01～10.0μg/mL,线性相关系数均大于0.999 0;检出限分别是0.003μg/mL,0.002μg/mL,0.006μg/mL。用于火电厂水汽中钾、钠、钙的测定,回收率分别为95.7%～104.7%,95.1%～103.9%,98.0%～105.0%;相对标准偏差均小于3.5%。

The atomic absorption spectrophotometry was used to determine K, Na, Ca in aqueous vapor from thermoelectric power station. The influence of the determination mediator and the releasing agent was studied. The results indicated that 1% hydrochloric acid as determination medium and 1 mL of SrCl2 （100 g/L） as releasing agent were chosen, a good determination result was achieved. The linear ranges of the calibration were 0. 01-2.00 μg/mL for K, 0.01-1.00 μg/mL Na, 0.01-10. 0 μg/mL for Ca, with a correlation coefficient of above 0. 999 0 for every element. The detection limits of K, Na, Ca were 0. 003 μg/mL, 0. 002 μg/mL, 0. 006 μg/mL, respectively. The mehod has been used for the determination of K, Na, Ca in aqueous vapor from power plant with the recoveries of 95.7%- 104.7% for K, 95. 1%-103.9% for Na and 98. 0%-105.0% for Ca and RSD of less than 3.5%.