@article {JING2020120378, title = {Sorbent and solvent co-enhanced direct analysis in real time-mass spectrometry for high-throughput determination of trace pollutants in water}, journal = {Talanta}, volume = {208}, year = {2020}, pages = {120378}, abstract = {
A sorbent and solvent co-enhanced direct analysis in real-time mass spectrometry (SSE-DART-MS) method was developed for high-throughput determination of trace pollutants in water. The use of sorbent for preconcentration and solvents for assisting desorption and ionization synergistically enhanced the signals from the trace pollutants detected by DART-MS. Phthalic acid esters (PAEs) were used as model analytes to validate the SSE-DART-MS method. Graphitic carbon nitride (g\–C3N4)\–based materials with two morphologies and six organic solvents were used to systematically evaluate the enhancement effect by the sorbent and solvent. A better analytical performance was achieved with the two-dimensional (2D) g-C3N4, compared to three-dimensional (3D) g-C3N4/C, indicating that the morphologies of sorbents played a key role in SSE-DART-MS analysis. The MS signals of all the analytes were increased by 10\–100 times for the two materials in the presence of the selected solvents. With the SSE-DART-MS method, concentration limits of detection for water samples in the range 0.07\–0.94 ng L\−1, and recovery in the range 82.8\–119\% using g-C3N4, were obtained for the PAEs. This work not only provides a reliable method for the coupling of solid phase extraction technique with DART-MS, but also presents valuable information for conducting other DART-MS analyses.
}, keywords = {desorption, direct analysis in real time mass spectrometry, Graphitic carbon nitride, IONIZATION, Phthalic acid esters, Solid phase extraction}, issn = {0039-9140}, doi = {https://doi.org/10.1016/j.talanta.2019.120378}, url = {http://www.sciencedirect.com/science/article/pii/S0039914019310112}, author = {Wenqiang Jing and Yanying Zhou and Jiaqin Wang and Yuanfeng Zhu and Youqi Lv and Wentao Bi and Chen, David D. Y.} } @article {3139, title = {EVALUATION OF MATRIX-ASSISTED LASER DESORPTION/IONIZATION TIME-OF-FLIGHT MASS-SPECTROMETRY FOR THE ANALYSIS OF ORGANOARSENIC COMPOUNDS OF ENVIRONMENTAL INTEREST}, journal = {Biological Mass Spectrometry}, volume = {23}, number = {12}, year = {1994}, note = {ISI Document Delivery No.: PX594Times Cited: 9Cited Reference Count: 45}, month = {Dec}, pages = {749-755}, type = {Article}, abstract = {Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS) was investigated for arsenic speciation of compounds of environmental interest. It is a very sensitive mass spectrometric technique which can detect as little as 0.3 ng of arsenic or 4 pmol of the arsenical under investigation. This feature suggests that the method could be used for the identification of minor arsenic components in environmental samples, Additional advantages of the technique are its capability of providing molecular ions as well as fragment ions for a variety of arsenicals, and allowing for a certain degree of control in compound fragmentation, by adjusting the N-2 laser power. Quantitative analysis by MALDI-TOF-MS is still considered a highly unreliable procedure since many variables associated with sample preparation and analytical procedure can seriously affect the results.}, keywords = {arsenic, arsenobetaine, ARSENOCHOLINE, COMPOUNDS, CONFIRMATION, desorption, FAST ATOM BOMBARDMENT, IDENTIFICATION, OLIGOSACCHARIDES, PERFORMANCE LIQUID-CHROMATOGRAPHY, SPECIATION}, isbn = {1052-9306}, url = {