title: Event monitoring of herbicides with naked and membrane-covered Empore disk integrative passive sampling devices.
abstract: Subsequent to an initial wet season flood event in the Brisbane River, Australia, both fast (naked disk) and slow (membrane-covered) variants of SDB-RPS Empore disk passive sampling devices were deployed with an automated grab sampling program. A trend increase in the aquatic dissolved concentrations of diuron and simazine was observed over a 10-day period. Kinetic and equilibrium parameters for each sampler were calculated based on the dynamic concentration. Absolute percent difference for duplicate passive samples was <10% in the fast and <25% in the slow samplers. For kinetic sampling, significantly shortened integrative periods are available with the fast compared with the slow variant, with higher sampling rates offering improved detection limits. The study demonstrates a method for determining kinetic parameters of passive samplers in a variable concentration field deployment, and illustrates the differences in quality between active and passive data, in terms of capturing changes in concentration associated with rainfall events.
authors.affiliation: The University of Queensland, National Research Center for Environmental Toxicology, 39 Kessels Rd., Coopers Plains 4108, Australia. Electronic address: scott.stephens@climatechange.gov.au.
authors.forename: B Scott
authors.initials: BS
authors.lastname: Stephens
authors.affiliation: The University of Queensland, National Research Center for Environmental Toxicology, 39 Kessels Rd., Coopers Plains 4108, Australia.
authors.forename: Anita P
authors.initials: AP
authors.lastname: Kapernick
authors.affiliation: Queensland Health and Scientific Services, Coopers Plains 4108, Queensland, Australia.
authors.forename: Geoff
authors.initials: G
authors.lastname: Eaglesham
authors.affiliation: The University of Queensland, National Research Center for Environmental Toxicology, 39 Kessels Rd., Coopers Plains 4108, Australia.
authors.forename: Jochen F
authors.initials: JF
authors.lastname: Mueller
mesh_terms: D004784:Environmental Monitoring / Q000295:instrumentation* / Q000379:methods; D006540:Herbicides / Q000032:analysis*; D045483:Rivers / Q000737:chemistry*; D013997:Time Factors
chemical_list: D006540:Herbicides