Determination of trace perchlorate in high-salinity water samples by ion chromatography with on-line preconcentration and preelution.
Determination of trace perchlorate in high-salinity water samples by ion chromatography with on-line preconcentration and preelution.
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采用在线预浓缩和预洗脱离子色谱法测定高盐水样中的痕量高氯酸盐。
DOI：
10.1021/ac026268l
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发表时间：
2003
影响因子：
7.4
通讯作者：
T. Anderson
中科院分区：
文献类型：
--
作者：
K. Tian;P. Dasgupta;T. Anderson
本文报道了一种在线富集离子色谱法测定痕量高氯酸盐的简便、自动化系统。样品被预浓缩，在分析物被转移到主分离系统之前，较弱的离子被预洗脱。这种方法提供了低的检测限（LOD），特别是对高浓度的常见阴离子，如那些存在于地下水样品中的效果鲁棒。它与目前颁布的EPA方法314.0相比毫不逊色。对于2 mL试剂水样，LOD（S/N = 3）为0.77 μ g/L，并且随着样品体积的增加（至少高达20 mL）或多或少成比例地降低。即使样品的电导率为14.7 mS/cm（约为0.1 M Na 2SO 4），在25.0 μ g/L水平下添加的高氯酸盐的回收率仍为92%。高氯酸盐的加入浓度在1-400 μ g/L范围内与峰面积呈线性相关，r2值为0.9997。用本方法从不同电导率的人工样品中回收高氯酸盐，与目前推荐的EPA方法相比，具有良好的效果。这种方法去除基质干扰的能力表明，它也将是有前途的高氯酸盐分析在其他具有挑战性的样品。
A simple, automated system for the determination of trace perchlorate by ion chromatography (IC) with an online preconcentration technique is reported. The sample is preconcentrated, and less strongly held ions preeluted before the analyte is transferred to the principal separation system. This approach provides low limits of detection (LOD) and is particularly robust toward the effect of high concentrations of common anions, such as those present in groundwater samples. It compares favorably with currently promulgated EPA method 314.0. The LOD (S/N = 3) is 0.77 microg/L for a 2-mL reagent water sample and decreases more-or-less proportionately with increasing sample volume, at least up to 20 mL. Even with a sample of conductivity 14.7 mS/cm (approximately that of 0.1 M Na2SO4), the recovery of added perchlorate at the 25.0 microg/L level was still 92%. The concentration of added perchlorate in the range of 1-400 microg/L was linearly correlated to the peak area, with an r2 value of 0.9997. The recovery of perchlorate from artificial samples with different conductivity by the present method compares favorably with those from the currently recommended EPA Method. The ability of this approach to remove matrix interferences suggests that it would be also promising for perchlorate analysis in other challenging samples.