title: Inhibition effect on the Allium cepa L. root growth when using hexavalent chromium-doped river waters.
abstract: The effect of Cr(6+) on Allium cepa root length was studied using both clean and polluted river waters. Seven series of Cr(6+)-doped polluted and non-polluted river waters were used to grow onions. Chromium concentration (Cr(6+)) of 4.2 mg L(-1)(EC(50) value), doped in clean river water caused a 50% reduction of root length, while in organically polluted samples similar root growth inhibition occurred at 12.0 mg Cr(6+) L(-1). The results suggested that there was a dislocation to higher values in toxic chromium concentration in polluted river water due to the eutrophization level of river water.
authors.affiliation: Chemical Engineering Postgraduate Program-NBQ, West Paraná State University, Rua da Faculdade, 645, Jardim Sta. Maria, Toledo, PR, 85903-000, Brazil. f.espinoza@terra.com.br
authors.forename: F R
authors.initials: FR
authors.lastname: Espinoza-Quiñones
authors.forename: N
authors.initials: N
authors.lastname: Szymanski
authors.forename: S M
authors.initials: SM
authors.lastname: Palácio
authors.forename: A N
authors.initials: AN
authors.lastname: Módenes
authors.forename: M A
authors.initials: MA
authors.lastname: Rizzutto
authors.forename: F G
authors.initials: FG
authors.lastname: Silva
authors.forename: A P
authors.initials: AP
authors.lastname: Oliveira
authors.forename: A C P
authors.initials: AC
authors.lastname: Oro
authors.forename: N
authors.initials: N
authors.lastname: Martin
mesh_terms: D002857:Chromium / Q000494:pharmacology / Q000633:toxicity*; D004305:Dose-Response Relationship, Drug; D019697:Onions / Q000187:drug effects* / Q000254:growth & development; D018517:Plant Roots / Q000187:drug effects* / Q000254:growth & development; D045483:Rivers / Q000737:chemistry*; D018675:Toxicity Tests / Q000379:methods; D014876:Water Pollution
chemical_list: D002857:Chromium; C074702:chromium hexavalent ion