顺序注射环定量光度法在线测定水中总铁

On-Line Determination of Total Iron in Water by Quantitative-Tube Equential Injection Spectrometry

摘要: 选用邻菲啰啉作为显色剂，采用顺序注射环定量(SIA)光度法，结合一整套系统的PLC程序，成功建立了测定水中总铁的新方法.实验过程中对各条件进行了优化，在最优条件下，体系的检测范围为0~10 mg/L，线性回归方程为A=0.0995c+0.0421(c：mg/L,n=8)，相关系数r为0.999 6，方法检出限为0.02 mg/L，相对标准偏差(RSD)为2.3%(0.50 mg/L，n=11)和1.7%(2.00 mg/L，n=11)，实际水样的加标回收率为97.1%~102.0%.

Abstract: A new method for the determination of total iron in water with 1,10-Phenanthroline as the chromogenic agent was developed using the quantitative-tube sequential injection spectrometry coupled with a completely set of PLC program system. Under optimized conditions,the detection range is 0~10 mg/L,the linear regression equation is A = 0.0995c+ 0.0421(c: mg/L,n=8) with correlation coefficient of 0.9996. The detection limit was 0.02 mg/L,and the recoveries of environmental samples were between 97.1%~102.0% with the relative standard deviation less than 2.3%.