离子色谱阀切换快速测定六氟磷酸根及多种阴离子

建立了快速测定离子液体中六氟磷酸根(PF6^-)及其它常规阴离子(F^-,CI^-,NO3^-,SO4^2-的离子色谱阀切换方法。通过保护柱与分离柱的简单切换,使强保留离子PF6^-仅通过保护柱,缩短其流通路径,在较短时间内出峰,其它离子既通过保护柱又通过分离柱,从而达到快速同时分离的目的。样品经稀释溶解后直接进样,淋洗液选用KOH,流速为1.0mL/min,采用抑制型电导检测,外标法定量。PF6,F,C1,N03和SO4^2-的线性范围分别为1-200mg/L,0.1~25mg/L,0.1-5mg/L,0.1~5mg/L和0.1~5mg/L,线性相关系数均大于0.9995;加标回收率在86....

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Published in分析化学 Vol. 39; no. 11; pp. 1738 - 1742
Main Author 朱作艺 许锦钢 钟乃飞 张培敏 朱岩
Format Journal Article
LanguageChinese
Published 浙江大学西溪校区化学系,杭州,310028%桂林理工大学化学与生物工程学院,桂林,541004 2011
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ISSN0253-3820
DOI10.3724/SP.J.1096.2011.01738

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Summary:建立了快速测定离子液体中六氟磷酸根(PF6^-)及其它常规阴离子(F^-,CI^-,NO3^-,SO4^2-的离子色谱阀切换方法。通过保护柱与分离柱的简单切换,使强保留离子PF6^-仅通过保护柱,缩短其流通路径,在较短时间内出峰,其它离子既通过保护柱又通过分离柱,从而达到快速同时分离的目的。样品经稀释溶解后直接进样,淋洗液选用KOH,流速为1.0mL/min,采用抑制型电导检测,外标法定量。PF6,F,C1,N03和SO4^2-的线性范围分别为1-200mg/L,0.1~25mg/L,0.1-5mg/L,0.1~5mg/L和0.1~5mg/L,线性相关系数均大于0.9995;加标回收率在86.5%~112.2%之间;相对标准偏差在1.4%~4.1%之间,检出限分别为8.9,0.41,0.44,1.2和1-2μg/L。本方法适用于一系列强弱保留离子同时分析的问题。
Bibliography:Ion chromatography; Valve switching; Ionic liquid; hexafluorophosphate; Fluoride(I);Chloride(I); Nitrate(I); Sulfate(Ⅱ)
A new method has been proposed for fast determination of hexafluorophosphate (PF6-) and some inorganic anions (F^- , C1^- , NO3^- , SO4^2- ). It was accomplished by valve switching between anion exchange guard column and separation column connected in series. With strong retentive ion (PF6 ) only through guard column and the inorganic anions through both guard column and separation column, the separation was completed within a much shorter time. Under the optimum conditions, the linear ranges of the method for PF6^-, F , CI-, NO3 and SO4^2- were 1-200 mg/L (r=0. 9997), 0.1-25 mg/L (r=0. 9995), 0.1-5 mg/L(r=0. 9997), 0.1-5 mg/L(r=0. 9997) and 0.1-5 mg/L(r=0. 9999), whereas detection limits calculated at S/N=3 were 8.90, 0.41, 0.44, 1.23 and 1.20 gg/L, respectively. The recoveries were in the range of 86. 5%- 112.2% with the relative standard deviations of 1.4%-4.1%. The method could be applied
ISSN:0253-3820
DOI:10.3724/SP.J.1096.2011.01738