{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,18]],"date-time":"2026-09-18T01:13:06Z","timestamp":1789693986737,"version":"4.0.1"},"reference-count":38,"publisher":"Wiley","issue":"17","license":[{"start":{"date-parts":[[2014,7,14]],"date-time":"2014-07-14T00:00:00Z","timestamp":1405296000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J of Separation Science"],"published-print":{"date-parts":[[2014,9]]},"abstract":"<jats:p>Matrix solid\u2010phase dispersion combined with dispersive liquid\u2013liquid microextraction has been developed as a new sample pretreatment method for the determination of four sulfonylurea herbicides (chlorsulfuron, bensulfuron\u2010methyl, chlorimuron\u2010ethyl, and pyrazosulfuron) in tea by high\u2010performance liquid chromatography with diode array detection. The extraction and cleanup by matrix solid\u2010phase dispersion was carried out by using <jats:styled-content style=\"fixed-case\">CN<\/jats:styled-content>\u2010silica as dispersant and carbon nanotubes as cleanup sorbent eluted with acidified dichloromethane. The eluent of matrix solid\u2010phase dispersion was evaporated and redissolved in 0.5\u00a0mL methanol, and used as the dispersive solvent of the following dispersive liquid\u2013liquid microextraction procedure for further purification and enrichment of the target analytes before high\u2010performance liquid chromatography analysis. Under the optimum conditions, the method yielded a linear calibration curve in the concentration range from 5.0 to 10\u00a0000 ng\/g for target analytes with a correlation coefficients (<jats:italic>r<\/jats:italic><jats:sup>2<\/jats:sup>) ranging from 0.9959 to 0.9998. The limits of detection for the analytes were in the range of 1.31\u20132.81 ng\/g. Recoveries of the four sulfonylurea herbicides at two fortification levels were between 72.8 and 110.6% with relative standard deviations lower than 6.95%. The method was successfully applied to the analysis of four sulfonylurea herbicides in several tea samples.<\/jats:p>","DOI":"10.1002\/jssc.201400449","type":"journal-article","created":{"date-parts":[[2014,6,24]],"date-time":"2014-06-24T01:56:39Z","timestamp":1403574999000},"page":"2380-2387","source":"Crossref","is-referenced-by-count":19,"title":["Determination of four sulfonylurea herbicides in tea by matrix solid\u2010phase dispersion cleanup followed by dispersive liquid\u2013liquid microextraction"],"prefix":"10.1002","volume":"37","author":[{"given":"Pei","family":"Liang","sequence":"first","affiliation":[{"name":"Key Laboratory of Pesticide and Chemical Biology of Ministry of Education College of Chemistry Central China Normal University  Wuhan P. R. 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