Basic HTML Version
MERC ER02-10
7
Live Organisms 10 - 50
µ
m
Vital Stain Results
-
It is important to note that the specific approach used underestimates
the abundances of live organisms in this size class because it has been found that not all live
organisms reliably take up these stains.
T0 #/ml
TF #/ml
Control
5,297 (776)
1,113 (225)
Treated
29 (19)
0 (0)
Dominant species
Type
Other
Heterocapsa rotundatum
Dinoflagellate
Small but abundant
Gymnodinium sp.
Dinoflagellate
Navicula sp.
Diatom
Active Chlorophyll-a
- Chlorophyll is used as ancillary data and as a general
presence/absence indicator of viable photosynthetic organisms.
T0 µg/l
TF µg/l
RG µg/l
Control
39.84 (11.77)
5.63 (0.50)
1.19 (0.13)
Treated
0.32 (0.13)
0.21 (0.02)
0.00 (0.01)
RG = after re-growth assay; MDL = 0.56 µg/l
Live Microbes
cfu = colony forming units
E. coli
T0
cfu/100ml
TF
cfu/100ml
Control
3.4 (1.52)
0.6 (1.34)
Treated
0 (0)
0 (0)
Enterococci
T0
NPM/100ml
TF
MPN/100ml
Control
3.92 (1.38)
9.06 (2.96)
Treated
1 (0.71)
1.2 (0.45)
MPN = most probably number estimate determined by the Idexx Enterolert kit.
V. cholerae –
No detectable culturable toxigenic
Vibrio cholerae
were detected in any
samples during any of the trials.
Heterotrophic
Bacteria
T0
(sd)
cfu/1ml
TF
(sd)
cfu/1ml
Control
1,518 (373.6)
808 (190.66)
Treated
2.2 (3.58)
29,120 (2,184.49)