title: Adaptation of a load-inject valve for a flow injection chemiluminescence system enabling dual-reagent injection enhances understanding of environmental Fenton chemistry.
abstract: Environmental Fenton chemistry has been poorly constrained within the marine environment at a multi-component level. A simple, unique, reconfiguration of a flow-injection analytical system combined with luminol chemiluminescence allows quasi-simultaneously the measurement, using a single load-inject valve and a single photon multiplier tube, of reduced iron, Fe(II), and hydrogen peroxide. The system enables rapid, every 22s, measurements with good accuracy at environmentally relevant concentrations, less than 5% relative standard deviations on both a 5 nM Fe(II) standard and a 60 nM hydrogen peroxide standard. Limits of detection were as low as 40 pM Fe(II) and 100 pM hydrogen peroxide. The system showed excellent capability by measuring from within an organic rich seawater the photochemically induced production of Fe(II) and hydrogen peroxide and their subsequent cycling and Fenton like interactions.
authors.affiliation: Laboratory for Marine and Atmospheric Chemistry, School of Environmental Sciences, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, UK. Electronic address: matthew_r_jones@rocketmail.com.
authors.forename: Matthew R
authors.initials: MR
authors.lastname: Jones
authors.forename: Philp D
authors.initials: PD
authors.lastname: Nightingale
authors.forename: Suzanne M
authors.initials: SM
authors.lastname: Turner
authors.forename: Peter S
authors.initials: PS
authors.lastname: Liss
keywords: Environmental Fenton chemistry; Flow injection analysis; Hydrogen peroxide; Iron; Luminol chemiluminescence; Reactive oxygen species