Presentation - National Water Research Institute

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Endogenous conc.of 100 nM and 10 000 nM for exogenous H 2 O 2 increased catalase hydroperoxidase in E.coli (Gonzalez-Flecha& Demple, 1997). Cells exposed to sunlight may be sensitized to lower concentrations. Some evidence for bacterial mortality from oxidative stress at lower exogenous conc. of 10 2 nM eg. › Angel et al. (1999) ~100 nM H 2 O 2 caused oxidative stress to bacteria in coastal waters as indicated by increasing catalase enzyme concentration › Xenopoulos & Bird (1997) spiked lake waters incubated in situ with 100 nM H 2 O 2 and observed inhibition of bacteria by ~40% › Kohn & Nelson (2007) concluded that indirect photoinactivation by photochemically produced reactive oxygen species was more important than direct damage by UVB light in sunlightmediated inactivation of MS2 coliphage in waste stabilization ponds.
What are H 2 O 2 production and destruction mechanisms and concentrations in the dynamic surf zone environment where FIB levels are monitored and regulated?
Page 2 and 3: Why is peroxide important? Typical
Page 4 and 5: Microbial water quality standards f
Page 8 and 9: Photochemical production from CDOM
Page 10 and 11: CDOM refers to a spectrum of highly
Page 12 and 13: H 2 O 2 levels had never been direc
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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