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MERC ER01-12
15
Particulate Organic Carbon
(POC) content of challenge water during uptake. Ambient describes
natural conditions of water in the Port of Baltimore. Control and treated show levels in test
waters from time-integrated samples collected through the entire uptake, after the mixture of
Arizona Test Dust, micronized humate and instant
ice tea was added to water prior to the split in
control and treated lines.
Mean (mg/l)
SD
Ambient
7.8
0.003
Control
10.8
0.13
UV Transmittance
(UVT) percentages for challenge water during uptake and discharge.
Ambient describes natural conditions of water in the Port of Baltimore and T0, T1, and T2 for
challenge water are %UVT values from three sample time points (beginning, middle, and end of
uptake) after the mixture of Arizona Test Dust, micronized humate and instant
ice tea was added.
Uptake
Mean %UVT
SD
Ambient
82.5
0.2
T0 challenge water
67.7
0.15
T1 challenge water
67.3
1.02
T2 challenge water
69.1
0.0
Discharge
Control Mean
%UVT
SD
Treated
Mean %UVT
SD
Ambient
74.0
0.06
74.0
0.06
T0 challenge water
74.0
0.15
74.2
0.06
T1 challenge water
74.1
0.06
74.6
0.2
T2 challenge water
74.2
0.017
74.0
0.15
Active Chlorophyll –
Control and treated show chlorophyll levels in test waters from time-
integrated samples collected through the entire uptake and discharge.
Live Organisms >50 µm –
Significant numbers of organisms in the control water on discharge
were dead, most likely due to a significant drop in dissolved oxygen level (see values above).
While dissolved oxygen levels also decreased in the treated water during the hold time, treated
water did not reach hypoxia. The organism in the size category included: Calanoida, cyclopoida,
harpactiocoida, copepod nauplii, polychaeta, barnacle nauplii, medusa, rotifer, eggs, and large
diatoms.
Uptake
Mean µg/l
Uptake
SD
Discharge
Mean µg/l
Discharge
SD
Control
219.3
1.82
28.0
0.52
Treated
215.6
4.59
37.5
0.65
Uptake Mean
org/m
3
Uptake
SD
Discharge
Mean org/m
3
Discharge
SD
Control
190,257
8,864
36,050
1,306
Treated
74,171
8,276
25,201
2,382