title: Diel cycles of hydrogen peroxide in marine bathing waters in Southern California, USA: in situ surf zone measurements.
abstract: Hydrogen peroxide is photochemically produced in natural waters. It has been implicated in the oxidative-induced mortality of fecal indicator bacteria (FIB), a microbial water quality measure. To assess levels and cycling of peroxide in beach waters monitored for FIB, diel studies were carried out in surf zone waters in July 2009 at Crystal Cove State Beach, Southern California, USA. Maximum concentrations of 160-200 nM were obtained within 1h of solar noon. Levels dropped at night to 20-40 nM, consistent with photochemical production from sunlight. Day-time production and night-time dark loss rates averaged 16 ± 3 nM h(-1) and 12 ± 4 nM h(-1) respectively. Apparent quantum yields averaged 0.07 ± 0.02. Production was largely dominated by sunlight, with some dependence on chromophoric dissolved organic matter (CDOM) levels in waters with high absorption coefficients. Peroxide levels measured here are sufficient to cause oxidative-stress-induced mortality of bacteria, affect FIB diel cycling and impact microbial water quality in marine bathing waters.
authors.affiliation: Department of Chemistry, Schmid College of Sciences, Chapman University, One University Drive, Orange, CA 92866, USA. cclark@chapman.edu
authors.forename: Catherine D
authors.initials: CD
authors.lastname: Clark
authors.forename: Warren J
authors.initials: WJ
authors.lastname: De Bruyn
authors.forename: Charlotte M
authors.initials: CM
authors.lastname: Hirsch
authors.forename: Paige
authors.initials: P
authors.lastname: Aiona
mesh_terms: D001493:Bathing Beaches; D002140:California; D055598:Chemical Phenomena; D004784:Environmental Monitoring; D006861:Hydrogen Peroxide / Q000032:analysis* / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
chemical_list: D014874:Water Pollutants, Chemical; D006861:Hydrogen Peroxide