TY - JOUR
T1 - Determination of trace perchlorate in high-salinity water samples by ion chromatography with on-line preconcentration and preelution
AU - Tian, Kang
AU - Dasgupta, Purnendu K.
AU - Anderson, Todd A.
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2003/2/1
Y1 - 2003/2/1
N2 - 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 μg/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 μg/L level was still 92%. The concentration of added perchlorate in the range of 1-400 μg/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.
AB - 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 μg/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 μg/L level was still 92%. The concentration of added perchlorate in the range of 1-400 μg/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.
UR - http://www.scopus.com/inward/record.url?scp=0037315035&partnerID=8YFLogxK
U2 - 10.1021/ac026268l
DO - 10.1021/ac026268l
M3 - Article
C2 - 12585505
AN - SCOPUS:0037315035
VL - 75
SP - 701
EP - 706
JO - Analytical Chemistry
JF - Analytical Chemistry
SN - 0003-2700
IS - 3
ER -