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Subsections
Lab-3 Field Procedure
- Collect Reconaissance Sample
- using sample bottle, bucket, or long-handled sampler collect
200-500 ml sample
- place in 500 ml amber glass bottle, cap the bottle, bring to
analysis table
- Perform the following tasks in any order (but start with
bacteria, since it must sit for 20 minutes). If you find
yourself waiting for a piece of equipment, try to start on one of
the other tasks
- Prepare filtered split, to be used for nitrate measurement.
Follow filtering procedure
- measure pH (follow pH-meter procedure)
- measure D.O., electrical conductivity, and salinity (follow
D.O. meter procedure)
- Measure Turbidity, follow the turbidity measurement
procedure
- Measure Nitrate Content, follow measurement
procedure
- Measure basic water quality, follow measurement
procedure
Lab-3 Comparative Results
Historical analyses from Prairie Creek near Plano Road (Table
4.3.1) and from the class groups (Table
4.3.1) are available for comparison. For conversion: ppm
mg/l for low-salinity water; low-salinity water at 26
contains 8.1 mg/l dissolved oxygen at saturation; at 15
saturated D.O content is 10.1 mg/l. See also online
bottled water analyses
and City of
Dallas tapwater analyses
.
Table 4.1:
Creek water chemical analyses from Prairie Creek near Plano Road
(1998 data).
Component |
Units |
March |
April |
May |
June |
July |
August |
Conductivity |
|
600 |
420 |
510 |
500 |
460 |
480 |
pH |
|
8.1 |
8.2 |
8.3 |
7.8 |
8.3 |
8.4 |
Turbidity |
NTU |
3.11 |
3.45 |
2.08 |
2.37 |
2.78 |
1.97 |
D.O. |
mg/l |
16.8 |
10.9 |
5.4 |
13.9 |
7.2 |
6.2 |
Nitrate |
ppm |
1.82 |
1.21 |
0.95 |
0.7 |
0.34 |
0.14 |
Water Temp. |
F |
64 |
58 |
75 |
80 |
88 |
82 |
Table 4.2:
Class water chemistry results, Spring Creek at Plano Rd.,
Sept. 26th 1998.
|
|
Group |
Component |
Units |
A |
B |
C |
Conductivity |
|
264.8 |
4564.1 |
234.0 |
pH |
|
8.21 |
8.17 |
8.07 |
Turbidity |
NTU |
1.49 |
1.63 |
2.97 |
D.O. |
% sat |
45.2, 50.1 |
52 |
39 |
Nitrate |
ppm |
1.7 |
1.9 |
2.0 |
Water Temp. |
|
27.2 |
27.2 |
26.7 |
Salinity |
ppt |
|
0.2 |
|
Table 4.3:
Selected water quality parameters for local treated water.
Parameter |
Hardness |
Alkalinity |
Turbidity |
Salinity |
pH |
Units |
ppm |
ppm |
NTU |
ppm |
- |
City of Dallas water |
98 |
53 |
0.3 |
180 |
|
Private Swimming Pool |
1000 |
180 |
0.4 |
1200 |
7.07 |
Discuss your own group's results, including any significant potential
sources of error. Compare your results to those of the
other groups,
and try to explain any differences. Compare your results to the
``historical'' data and discuss why the stream chemistry changes with time
(season).
For those who missed the field portion of this lab, do the following.
- write the introduction-procedures portion of you notebook
entry for this lab
- write a procedures section. This will be difficult, since
you weren't at the field lab. See the Parameters to
be Measured for a description of the measurements made.
- Chapter 9 of the textbook (``Field Geochemical
Measurements'' section describes the general approach, see also the
detailed procedures sections above.
- Reference the Comparative Results, pretend you were a
member of one of the
three groups (A-C) and analyze their data for your Discussion
section.
- Turn you lab notebook copies in at the beginning of the
next lab
Next: Groundwater Characterization (Lab 4)
Up: Water Quality Measurements (Lab
Previous: Lab-3 Activities
GEOS 3110 Professor's Notes, Summer 2007
Dr. T. Brikowski, U. Texas-Dallas. All rights reserved.