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concentration (nM) 200 180 160 140 120 100 80 60 40 20 0 1 2 3 4 5 6 7 8 9 10 11 12 13 beach sites Clark et al., Water Research, 2010 13 beaches; flood tide at noon Summer dry season concentrations averaged 122 ± 38 nM Beaches with tide pools had lower levels (50-90 nM). Little annual variation. Average surf zone concentrations measured here comparable to 183 nM for near-shore So. Cal. waters (Avalon, Boehm et al., 2009) and within range previously obtained in estuarine (10 - 350 nM), coastal (14-240 nM), and some ocean waters (8- 150 nM).
Measured H 2 O 2 levels at HB as a function of time of day for 5 wks in summer for 3 local time periods: morning (08:00-09:30), noon (11:00-13:00) and evening (20:00-21:00) Morning levels after ~2 h of sunshine averaged 124 ± 24 nM, statistically lower than at noon (160 ± 34 nM). Evening samples at 94 ± 18 nM were statistically lower than the noon samples. No significant tidal effects Clark et al., Water Research, 2010
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 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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