离子色谱法测定水利工程水样中Cl-和SO42-的含量

摘要

取水利工程水样过滤后,以TSKgel IC-Anion-PWXL PEEK阴离子柱为分离柱,以2.5 mmol·L-1四硼酸钠溶液(用乙二胺调节其酸度至pH 10.5)为淋洗液进行离子色谱分离,用非抑制型电导检测器进行测定.Cl-和SO42-的质量浓度均在2.50~50.00 mg·L-1内与其对应的峰面积呈线性关系,Cl-和SO42-的检出限(3S/N)依次为5.1,7.6μg·L-1.对空白水样连续测定5次,Cl-和SO42-的峰面积的相对标准偏差依次为4.1%,2.3%.测得加标回收率在97.9%~102%之间.%Water sample of hydraulic engineering was filtered,and separated by IC,using TSKgel IC-Anion-PWXL PEEK anionic column as separation column,and 2.5 mmol·L-1 sodium tetraborate solution (pre-adjusted to pH 10.5 with ethylenediamine)as eluant.Non-restrain conductance detector was used in the determination.Linear relationships between values of peak area and mass concentration of Cl- and SO42- were kept in the same range of 2.50-50.00 mg·L-1 ,with detection limits (3S/N)of 5.1,7.6μg·L-1 respectively.Precision of the method was tested with blank water sample for 5 determinations,values of RSD′s (in terms of peak area)found for Cl-and SO42- were 4.1%and 2.3%,respectively.Values of recovery found by standard addition method were in the range of 97.9%-102%.