畢文韜副教授、David Chen教授課題組在ANALYTICAL CHEMISTRY發(fā)表研究論文
Dispersive Magnetic Solid-Phase Extraction Coupled to Direct Analysis in Real Time Mass
Spectrometry for High-Throughput Analysis of Trace Environmental Contaminants
Jing, WQ (Jing, Wenqiang)[ 1,2 ] ; Zhou, YY (Zhou, Yanying)[ 1 ] ; Wang, JQ (Wang, Jiaqin)[
1 ] ; Ni, M (Ni, Miao)[ 1 ] ; Bi, WT (Bi, Wentao)[ 1 ]（畢文韜）*; Chen, DDY (Chen, David
Da Yong)[ 2 ]*
[ 1 ] Nanjing Normal Univ, Coll Chem & Mat Sci, Nanjing 210023, Jiangsu, Peoples R China
[ 2 ] Univ British Columbia, Dept Chem, Vancouver, BC V6T 1Z1, Canada
ANALYTICAL CHEMISTRY,201909,91(17)，11240-11246
Coupling dispersive magnetic solid-phase extraction (DMSPE) to direct analysis in real time
mass spectrometry (DART-MS) with a newly developed metal iron probe enables high-
throughput, sensitive detection of herbicides such as triazine in environmental waters.
Magnetic graphene oxide was used as a dispersive sorbent because it increased adsorption
capacity in the DMSPE process. The planar structure and excellent thermal conductivity of
graphene oxide facilitated the desorption and ionization of target analytes in DART-MS
analysis. The iron probe, which is designed to fit into the moving trail of the DART
interface, served as the sorbent collector as well as the support for the magnetic graphene
oxide after DMSPE, and was put directly into the DART system. The ratio of magnetic core to
graphene oxide in the nanoparticles and other key parameters in DMSPE and DART-MS
procedures were systematically investigated and optimized. In addition, the presence of
water on the sorbent proves to have a significant effect on DART-MS analysis. No organic
solvents are used in this method, and the reusable iron probe is of low cost. Under the
optimal conditions, limits of detection were found in the range of 1.6-152.1 ng/L for the
triazines. Recovery and reproducibility were found to be in the ranges of 87.5-115.0% and
1.9-10.2%, respectively, for the six herbicides studied. The analytical performance of the
DMSPE-DART-MS method indicated that applications for trace analysis of other compounds in
liquid samples are also possible.
文章鏈接：
https://pubs.acs.org/doi/10.1021/acs.analchem.9b02197
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