Table 1. Concentrations of selected constituents, San Marcos Springs, San Marcos, Texas, July–August 1994
[mS/cm, microsiemens per centimeter at 25 degrees Celsius; °C, degrees Celsius; mg/L, milligrams per liter; --, no data; <, less than detection limit; mg/L, micrograms per liter]
Selected properties and
major ions |
Site 1 |
Site 2 |
Site 3 |
Site 4 |
Specific conductance (mS/cm) |
588 |
589 |
582 |
608 |
pH (standard units) |
7.8 |
7.5 |
7.6 |
7.7 |
Temperature (°C) |
23 |
22.5 |
23 |
23.5 |
Dissolved oxygen (mg/L) |
8.8 |
8 |
8.6 |
8.3 |
Calcium, dissolved (mg/L) |
86 |
86 |
82 |
86 |
Magnesium, dissolved (mg/L) |
17 |
17 |
16 |
17 |
Sodium,
dissolved (mg/L) |
11 |
11 |
11 |
16 |
Potassium, dissolved (mg/L) |
1.4 |
3.3 |
1.3 |
1.9 |
Sulfate, dissolved (mg/L) |
23 |
24 |
23 |
26 |
Chloride, dissolved (mg/L) |
19 |
18 |
19 |
24 |
Fluoride, dissolved (mg/L) |
.2 |
.2 |
.2 |
.2 |
Silica, dissolved (mg/L) |
11 |
11 |
11 |
11 |
Dissolved solids, sum of
constituents (mg/L) |
328 |
331 |
310 |
344 |
|
|
|
|
|
Nutrients (mg/L) |
|
|
|
|
Nitrogen, nitrate,
dissolved |
-- |
-- |
-- |
1.76 |
Nitrogen, nitrite,
dissolved |
<.01 |
<.01 |
<.01 |
.04 |
Nitrogen, ammonia,
dissolved |
.03 |
.03 |
.04 |
.08 |
Nitrogen, total |
1.2 |
1.2 |
1.1 |
1.8 |
Phosphorus, dissolved |
<.01 |
<.01 |
.03 |
.13 |
Phosphate, ortho, dissolved |
.03 |
-- |
.03 |
.34 |
|
|
|
|
|
Trace elements (mg/L) |
|
|
|
|
Arsenic, dissolved |
<1 |
<1 |
1 |
<1 |
Barium, dissolved |
36 |
37 |
35 |
35 |
Cadmium, dissolved |
1 |
<1.0 |
<1.0 |
<1.0 |
Chromium, dissolved |
<5 |
<5 |
<5 |
<5 |
Copper, dissolved |
<10 |
<10 |
<10 |
<10 |
Iron, dissolved |
<3 |
<3 |
<3 |
4 |
Lead, dissolved |
<10 |
20 |
<10 |
20 |
Manganese, dissolved |
1 |
3 |
5 |
4 |
Mercury, dissolved |
<.1 |
<.1 |
<.1 |
<.1 |
Nickel, dissolved |
<10 |
<10 |
<10 |
<10 |
Selenium, dissolved |
<1 |
<1 |
<1 |
<1 |
Silver, dissolved |
<1.0 |
<1.0 |
<1.0 |
<1.0 |
Strontium, dissolved |
540 |
540 |
520 |
540 |
Zinc, dissolved |
<3 |
<3 |
<3 |
<3 |
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