Presentation - National Water Research Institute

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Beach sand contained dark magnetic grains (iron mineral?) Preliminary study: › Acid digestion of 2 sand samples with AA analysis › Leachate from sand sample with more visible dark grains had higher (x2) Fe concentrations Production of H 2 O 2 from iron (Fe(II)/Fe(III)) in fresh and coastal seawater (Miller et al., 1995; Southworth and Voelker, 2003). Hypothesize that iron in beach sand/dissolved in seawater is a significant photochemical source of peroxide compared to CDOM in study area
Explore contributions to hydrogen peroxide production from kelp, intertidal beach sand, dissolved metals and other potential coastal sources › Role of dissolved iron in production in seawater • Photochemical production as a function of iron and CDOM levels in a range of seawater and beach sand samples › Effect of microorganisms in filtered vs. unfiltered seawater › In situ diel sampling of kelp beds for CDOM and photochemical and biological production of peroxide › Oil seeps?
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 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 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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