Environmental Engineering Reference
In-Depth Information
Table 6.2 Summary of methods for the determination of water quality parameters commonly measured in wetland monitoring studies
Minimum
sample size
(mL)
Method
reference/
discussion a
Parameter (common
units)
Collection
container
Example instrumentation/method
Preservation
Maximum storage time
Temperature ( C)
Thermometer, Temperature sensor/Water
quality meter, data logger
In situ ,
plastic,
glass
N/A
Analyze immediately NA
1, 2
In situ ,
glass
Dissolved oxygen
(mg/L or %
saturation)
Oxygen electrode/Water quality meter,
Winkler titration
300
Winkler titration-
acidification step
Immediately if by electrode,
Winkler titration- 8 h
after acidification
1, 3
pH
pH electrode/Water quality meter
In situ ,
plastic,
glass
50
Analyse immediately NA
1, 4
Alkalinity (as mg
CaCO 3 /L)
Acid titration with indicator solution
Plastic,
glass
200
Refrigerate
24 h
1, 8
Total dissolved solids
(mg/L)
Sample filtration, drying and weighing
Plastic,
glass
200
Refrigerate
7 days
10
Salinity (g/L)
Some water quality meters derive salinity
from conductivity measurements,
hand-held refractometers can provide
a general indication
Glass
240
Analyze immediately NA
1, 6
Specific Conductance
(microSiemens/
cm
Conductivity probe/Water quality meter
In situ ,
plastic,
glass
500
Refrigerate
28 days
1, 5
¼ μ
S/cm)
Total Hardness
(as mg CaCO 3 /L)
EDTA titration
Plastic,
glass
100
Add HNO 3 or H 2 SO 4
to pH
6 months
1, 7
2
<
Total suspended
solids (mg/L)
Sample filtration, drying and weighing
Plastic,
glass
200-
depends
on level
Refrigerate
7d
11
Turbidity
(Nephelometric
turbidity units,
Nephelometer/Turbidity meter
Plastic,
glass
100
Refrigerate in dark
24 h
1, 9
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