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No a priori assumptions concerning separation of slow and fast variables are made, or necessary. We apply the theoretical results to chemical reaction networks with mass action kinetics admitting slow and fast reactions. For some relevant classes of such systems, there exist canonical parameterizations of the variety of stationary points; hence, the theory is applicable in a natural manner. In particular, we obtain a closed form expression for the reduced system when the fast subsystem admits complex-balanced steady states.<\/jats:p>","DOI":"10.1007\/s00332-020-09610-3","type":"journal-article","created":{"date-parts":[[2020,1,25]],"date-time":"2020-01-25T05:07:07Z","timestamp":1579928827000},"page":"1355-1380","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Tikhonov\u2013Fenichel Reduction for Parameterized Critical Manifolds with Applications to Chemical Reaction Networks"],"prefix":"10.1007","volume":"30","author":[{"given":"Elisenda","family":"Feliu","sequence":"first","affiliation":[]},{"given":"Niclas","family":"Kruff","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4763-6869","authenticated-orcid":false,"given":"Sebastian","family":"Walcher","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2020,1,25]]},"reference":[{"volume-title":"Dynamical Systems I","year":"1988","key":"9610_CR1","unstructured":"Arnold, V.I., Anosov, D.V. 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