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目的建立水处理剂聚合硫酸铁中砷的氢化物原子荧光光谱法。方法水处理剂聚合硫酸铁经预处理后,以20g/L硼氢化钠-2g/L氢氧化钠为还原剂,以5%的盐酸作载流,采用氢化物原子荧光光谱法测定水处理剂聚合硫酸铁中砷的浓度。结果砷的浓度在0.80~20μg/L时,所得到的回归方程为y=55.141x-9.263,相关系数为0.999 8,表明呈良好的线性关系。以3倍的空白标准差计算,该方法的检出限为0.40μg/L。该方法的平均回收率为96.4%~103.0%,RSD为2.5%~3.8%。结论该方法灵敏度高、准确性好、分析快速、操作简单,适用于水处理剂聚合硫酸铁中砷的测定。
Objective To establish a hydride atomic fluorescence spectrometry of arsenic in polymeric ferric sulphate as water treatment agent. Methods After the pretreated polymeric ferric sulfate was treated with 20g / L sodium borohydride - 2g / L sodium hydroxide as reducing agent and 5% hydrochloric acid as carrier, the hydride generation atomic fluorescence spectrometry was used to determine the concentration of water treatment agent Concentration of arsenic in polymerized ferric sulphate. Results When the concentration of arsenic was 0.80 ~ 20μg / L, the regression equation was y = 55.141x-9.263, the correlation coefficient was 0.999 8, which showed a good linear relationship. With a 3-fold blank standard deviation, the limit of detection of this method was 0.40 μg / L. The average recoveries of this method ranged from 96.4% to 103.0% with RSDs ranging from 2.5% to 3.8%. Conclusion The method has high sensitivity, good accuracy, fast analysis and simple operation. It is suitable for the determination of arsenic in polymeric ferric sulfate.