ICP-AES法和分光光度法测定工业废水中总磷的方法比较

用ICP-AES法和分光光度法同时测定4种不同工业废水中的总磷含量,将2种方法的测定结果作比对。试验表明,ICP-AES法对国家标准样品的测定结果具有较高的准确度和精密度,4种废水样品测定结果的加标回收率为94.0%~110%,RSD在0.9%~3.2%之间。分光光度法适用于低浓度、低干扰样品的测定,对于高浓度含磷废水,取样体积和样品稀释倍数均会对其测定结果产生显著影响。消解样品经浊度-色度补偿后,分光光度法的测定结果精密度较低。

Method Comparison between ICP AES and Ammonium Molybdate Spectrophotometry in Determination of Total Phosphorus in Industrial Wastewater

Total phosphorus in four different kinds of industrial wastewater was determined using ICP AES method and ammonium molybdate spectrophotometric method, the accuracy and precision of testing results between the two methods were compared. The results showed there was a high accuracy and precision in testing national standard samples using ICP AES method. The recovery of this method ranged from 94.0% to 110% and the RSDs varied from 0.9% to 3.2% in testing four different kinds of industrial wastewater. Ammonium molybdate spectrophotometric method is appropriate for samples with low concentration and low interference, since sampling volume and dilution factors had significant effects on testing results in high concentration samples. The precision of testing results using ammonium molybdate spectrophotometric method was bad after the colority and turbidity were compensated.