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 ]（毕文韬）*; 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.

文章链接：
https://pubs.acs.org/doi/10.1021/acs.analchem.9b02197

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