摘要
提出新型高通量离子色谱仪快速测定水利工程水样中5种阳离子Na^+、NH_4^+、Mg^(2+)、Ca^(2+)和K^+的含量的方法。采用TSKgel Super IC-CR阳离子交换柱,以2.2 mmol·L^(-1)甲基磺酸和1.00 mmol·L^(-1)18冠醚6的混合液为淋洗液,流量为0.7 mL·min^(-1),柱温为40℃,凝胶抑制电导检测,可在18 min内完成对5种阳离子的分析。5种无机阳离子的质量浓度在一定范围内与其峰面积呈线性关系,Na^+、NH_4^+、Mg^(2+)、Ca^(2+)和K^+的检出限(3S/N)分别为7.1,6.3,9.5,10.0,8.3μg·L^(-1),水样的加标回收率为95.3%~104%,相对标准偏差(n=5)为0.26%~4.0%。
A method for rapid determination of 5 cations in water sample of water project, including Na^＋ , NH4^＋ , Mg^2＋ , Ca^2＋ and K^＋ , by the novel and high throughput ion chromatography （IC） was proposed. Five cations were separated well in 18 min by TSKgel SuperIC-CR cation exchange column under gel suppressed conductivity detection, and a mixture of 2. 2 mmol · L^-1 methanesulfonic acid solution and 1.00 mmol· L^-1 18- crown-6 solution was used as eluent at a flow rate of 0. 7 mL · min^-1 , with column temperature of 40 ℃. Linear relationships between values of peak area and mass concentration of the 5 cations were kept in definite ranges. The detectionlimits （3S/N） of Na^＋, NH4^＋, Mg^2＋, Ca^2＋ and K^＋ were 7. 1, 6. 3, 9. 5, 10. 0, 8. 3 μg·L^-1, respectively. Values of recovery of the 5 cations in water samples were in the range of 95.3%-104%, with RSDs （n=5） ranged from 0. 26% to 4. 0%.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2018年第1期59-63,共5页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
基金
全球环境基金资助项目(4632)
关键词
离子色谱法
水质分析
无机阳离子
ion chromatography
water analysis
inorganic cation
