title: Metal speciation by flow-injection analysis.
abstract: A two-channel switching valve is incorporated in the flow-injection manifold for on-line control of the metal speciation of Fe(II)/Fe(III) and Cr(III)/Cr(VI). 1,10-Phenanthroline is used for the iron determinations and diphenylcarbazide for chromium. The absorbances are measured at 512 and 540 nm, respectively. When a 30-mul injection loop is used, the response is linear for 0.5-30.0 ppm Fe and 0.5-40.0 ppm Cr. The relative standard deviation in each case is approximately 1%. The method allows at least 180 injections per hour.
authors.affiliation: Department of Chemistry, Miami University, Oxford, OH 45056, U.S.A.
authors.forename: B P
authors.initials: BP
authors.lastname: Bubnis
authors.forename: M R
authors.initials: MR
authors.lastname: Straka
authors.forename: G E
authors.initials: GE
authors.lastname: Pacey