电感耦合等离子体质谱(ICP-MS)法测定废水中有害元素银的含量

Determination of Harmful Element Silver in Waste Water by Inductively Coupled Plasma Mass Spectrometry(ICP-MS)

为了寻求一种更适合废水中低含量银的测定方法,采用石墨电热板消解-电感耦合等离子体质谱(ICP-MS)法测定废水中的低含量银离子。通过仪器工作条件优化、检出限、准确度、精密度、实际样品加标回收等实验,并与电感耦合等离子体原子发射光谱(ICP-AES)法的实际样品测定结果进行比对来评价方法的实用性。石墨电热板消解-电感耦合等离子体质谱法前处理方法简便,分析速度快且检出限较低,为0.03μg/L,标准样品测定的相对误差为-0.7%~1.7%,相对标准偏差为1.1%~2.5%,实际样品加标回收率在97.0%~103%,回收率高,能够满足废水中低含量银的测定。

In order to find a more suitable method for the determination of low-content silver in waste water,graphite electrothermal plate digestion-inductively coupled plasma mass spectrometry was used to determine low-content silver ions in waste water.The utility of the method was evaluated by optimizing the working conditions of the instrument,determining the linear regression equation,detection limit,accuracy,precision,recovery of the actual sample and comparing the results with the real sample determination results of the inductively coupled plasma method(ICP-AES).The pretreatment method of graphite electrothermal plate digestion-inductively coupled plasma mass spectrometry is simple,the analysis speed is fast and the detection limit is 0.03μg/L,the relative error of standard sample determination is 0.7%—1.7%,the relative standard deviation is 1.1%—2.5%,the recovery of standard-added sample is between97.0%—103%,and the recovery is high enough for the determination of low-content silver in waste water.