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In this paper, the EK motion and viability assessment of live algae mixed with the NaClO treated dead algae were carried out at the interface formed by polyethylene glycol (PEG)\u2010rich phase and dextran (DEX)\u2010rich phase in a straight microchannel. The experimental results show that both the live and dead algae at the PEG\u2013DEX interface migrate from the negative electrode to the positive electrode, and the EK velocity of live algae at the interface is slightly larger than that of the dead ones with similar diameters. For either live or dead algae, the EK velocity at the interface decreases with the increase in diameter. A size\u2013velocity curve was used to evaluate the viability of the algae. As most of the microorganisms in ballast water are algae, the method in this paper provides a promising way to detect and evaluate the live microorganism in treated ballast water of a ship.<\/jats:p>","DOI":"10.1002\/elps.202300057","type":"journal-article","created":{"date-parts":[[2023,7,13]],"date-time":"2023-07-13T01:56:15Z","timestamp":1689213375000},"page":"1818-1825","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Electrokinetic motion and viability assessment of algae with a polyethylene glycol\u2013dextran interface"],"prefix":"10.1002","volume":"44","author":[{"given":"Runxin","family":"Xu","sequence":"first","affiliation":[{"name":"College of Navigation Dalian Maritime University  Dalian P. R. 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