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Optimization of sample preparation and improvement of chromatographic separation are prerequisite to improve reproducibility and selectivity. Matrix components are reduced if not eliminated by optimization of sample preparation steps. However, extensive sample preparation may be time\u2010consuming and risk the significant loss of some trace analytes. The best way to further compensate matrix effects is the use of an internal standard for each analyte. However, in a multi\u2010component analysis, finding appropriate internal standards for every analyte is often difficult. In this present study, a more practical alternative option was sought. Matrix effects were assessed using the post\u2010extraction addition method. By comparison of three different calibration approaches, it was found that matrix\u2010matched calibration combined with one internal standard provides a satisfactory method for compensating for any residual matrix effects on all the analytes. Validating experiments on different sewage treatment plant (STP) influent samples analyzing for a range of phytoestrogens showed that this calibration method provided satisfactory results with concentration ratio 96.1\u2013105.7% compared to those by standard addition. Copyright \u00a9 2007 John Wiley &amp; Sons, Ltd.\n                  <\/jats:p>","DOI":"10.1002\/rcm.3311","type":"journal-article","created":{"date-parts":[[2007,11,16]],"date-time":"2007-11-16T06:17:09Z","timestamp":1195193829000},"page":"4065-4072","source":"Crossref","is-referenced-by-count":52,"title":["Using calibration approaches to compensate for remaining matrix effects in quantitative liquid chromatography\/electrospray ionization multistage mass spectrometric analysis of phytoestrogens in aqueous environmental samples"],"prefix":"10.1002","volume":"21","author":[{"given":"Jinguo","family":"Kang","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Larry A.","family":"Hick","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"William 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