Presentation - National Water Research Institute

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H 2 O 2 levels had never been directly measured in the surf zone where microbial water quality is monitored. To assess the importance of H 2 O 2 in monitored marine recreational waters, we conducted a spatial and temporal study of surf zone concentrations at popular bathing beaches in Southern California on short (24 h in situ field studies; 30 to 60 min intervals) and long (weekly/monthly/annual) time scales. Focused much of this study on Huntington State Beach as part of a larger multi-investigator study aimed at elucidating sources and cycling of surf-zone FIB (Boehm et al., 2002; Grant et al., 2005). Discuss trends observed between H 2 O 2 levels and tide, time of day and season. Compare concentrations, production and loss rates obtained in the surf zone to previous near and off-shore seawater studies.
Enzyme-mediated fluorescence peroxidase technique by Zika and Saltzman (1982) used for most previous surface seawater measurements (Clark et al., 2008). Filter field fluorometer (Turner 10-AU-0) with excitation ~354 nm and emission ~496 nm. Detection limit ~5 nM in seawater. 2-4 replicate measurements averaged, with an average
Page 2 and 3: Why is peroxide important? Typical
Page 4 and 5: Microbial water quality standards f
Page 6 and 7: Endogenous conc.of 100 nM and 10 00
Page 8 and 9: Photochemical production from CDOM
Page 10 and 11: CDOM refers to a spectrum of highly
Page 14 and 15: Change in %Fluorescence Refridgera
Page 16 and 17: Seal Beach Doheny State Beach
Page 18 and 19: [H 2 O 2 ] (nM) Measured in salt
Page 20 and 21: Production Rate (nM/s) HPPR incre
Page 22 and 23: HPPR varied significantly (5x) for
Page 24 and 25: concentration (nM) 200 180 160 140
Page 26 and 27: 24 hour diel study at HSB, 30 min i
Page 28 and 29: 4 diel studies in surf zone waters
Page 30 and 31: Field study 2 Clark et al., Marine
Page 32 and 33: Field study 4 Clark et al., Marine
Page 34 and 35: Absorption coefficients used as a p
Page 36 and 37: Prior studies: › H 2 O 2 from dec
Page 38 and 39: Measured photochemical production o
Page 40 and 41: Beach sand contained dark magnetic
Page 42 and 43: The oxidant H 2 O 2 is photochemica
Page 44: Scott Jakubowski Liannea Litz Cha

Presentation - National Water Research Institute

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