Journal
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Volume 411, Issue 5, Pages 1067-1073Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-018-1535-3
Keywords
Capillary electrophoresis-; mass spectrometry (CE; MS); Single-drop microextraction (SDME); Large-volume sample stacking using an electroosmotic flow pump (LVSEP); Sample preparation; Soil
Funding
- National Research Foundation of Korea [NRF-2016R1A2B2011878, NRF-2017M2A8A5014710, NRF-2017K1A3A1A67016126]
- National Research Foundation of Korea [2017K1A3A1A67016126] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Single-drop microextraction (SDME) and large-volume sample stacking using an electroosmotic flow pump (LVSEP) were coupled with capillary electrophoresis/mass spectrometry (CE/MS) for sample cleanup and preconcentration. Without filtration or centrifugation of a soil sample containing debris, SDME using a pentanol acceptor drop was directly applied to the sample. After SDME, a large volume of the enriched pentanol extract was injected and further concentrated by LVSEP. For the drop formation in SDME and the sample matrix removal in LVSEP, a run buffer vial was temporarily placed to the electrospray tip, without any physical modification of the CE/MS interface. This method enabled the double preconcentration by SDME and LVSEP, achieving 600 similar to 1300-fold enrichments of anionic analytes including pesticide and herbicide compounds to provide limits of detection in the range of 0.4 similar to 0.8ppb in soil.
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