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Determination of Trace-Level Perchlorate by IC-MS/MS and Distribution in the Han River  

Kim, Hyun-Hee (Waterworks Research Institute, Seoul Metropolitan Government)
Han, Ihn-Sup (Department of Environmental Engineering, University of Seoul)
Jeong, Gwan-Jo (Waterworks Research Institute, Seoul Metropolitan Government)
Park, Hyeon (Waterworks Research Institute, Seoul Metropolitan Government)
Han, Sun-Hee (Waterworks Research Institute, Seoul Metropolitan Government)
Cho, Wan-Seon (Waterworks Research Institute, Seoul Metropolitan Government)
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Abstract
Ion chromatography (IC) coupled with conductivity detector (CD) is a common system for the determination of perchlorate in water samples. Although the IC method with CD has been widely used for the determination of trace level perchlorate ion in water, sensitivity decreases dramatically as the complexity of the matrices increases. Here we proposed the application of ion chromatography coupled with mass spectrometry (IC-MS/MS) to significantly improve selectivity of perchlorate. The mean recovery of the method was 104.4 ${\pm}$ 5.7% and the relative standard deviation (RSD%) was 1.9 ${\pm}$ 1.3%. The alculated method detection limit (MDL) was 0.0207 ${\pm}$ 0.0099 ${\mu}g/L$. The concentrations of perchlorate were minimum <0.1 ${\mu}g/L$ and maximum 18.3 ${\mu}g/L$ in source water (Namhan, Bukhan and Han River). Hongreung showed higher concentrations ($1^{st}$-14.3 ${\mu}g/L$, $2^{st}$-18.3 ${\mu}g/L$) than the other places. And the concentrations of perchlorate were 0.18~0.34 ${\mu}g/L$ in the samples taken from the six water treatment plants and six intake stations in Seoul.
Keywords
IC-MS/MS; perchlorate; ion-chromatography; Han River;
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