Table 6. Concentrations of nutrients in samples collected at the urban indicator site, Salado Creek (lower station) at San Antonio
[ft3/s, cubic feet per second; mg/L, milligrams per liter; <, less than: MDL, method detection limit]
|
|||||||||
Date | Dis- charge (ft3/s) |
Nitrogen, ammonia, dis- solved (mg/L) |
Nitrogen, nitrite, dis- solved (mg/L) |
Nitrogen, ammonia plus organic, dissolved (mg/L) |
Nitrogen, ammonia plus organic, total (mg/L) |
Nitrogen, nitrite plus nitrate, dissolved (mg/L) |
Phos- phorus, total (mg/L) |
Phos- phorus, dis- solved (mg/L) |
Phos- phorus, ortho- phosphate, dissolved (mg/L) |
|
|||||||||
04-22-96 |
4 |
0.11 |
0.01 |
0.3 |
0.5 |
0.31 |
0.1 |
0.04 |
0.03 |
05-21-96 |
1 |
.15 |
.02 |
.3 |
.6 |
.3 |
.2 |
.07 |
.08 |
06-27-96 |
9 |
.1 |
.05 |
.4 |
.7 |
.6 |
.15 |
.07 |
.06 |
07-29-96 |
1 |
.12 |
<.010 |
.4 |
.7 |
.2 |
.12 |
.03 |
.04 |
09-03-96 |
2 |
.05 |
.02 |
.3 |
.4 |
.39 |
.07 |
.04 |
.06 |
10-15-96 |
3 |
.07 |
.02 |
.2 |
.3 |
.2 |
.05 |
.04 |
.04 |
11-06-96 |
2 |
.03 |
.01 |
<.20 |
.2 |
.09 |
.03 |
.04 |
.03 |
12-05-96 |
11 |
.03 |
.01 |
<.20 |
.3 |
.38 |
.08 |
.06 |
.04 |
01-23-97 |
4 |
<.015 |
.03 |
<.2 |
.4 |
.25 |
.06 |
.02 |
<.010 |
02-07-97 |
4 |
.02 |
.01 |
.3 |
.4 |
.16 |
.04 |
<.010 |
<.010 |
02-20-97 |
24 |
<.015 |
.03 |
.3 |
.4 |
.5 |
.04 |
.01 |
.02 |
03-06-97 |
6 |
.08 |
.02 |
.3 |
.4 |
.57 |
.08 |
.07 |
.06 |
03-20-97 |
11 |
.07 |
.03 |
.3 |
.3 |
.5 |
.12 |
.11 |
.04 |
04-09-97 |
12 |
.087 |
.037 |
.37 |
.51 |
.713 |
.102 |
.065 |
.075 |
04-16-97 |
7 |
.036 |
.022 |
.27 |
.37 |
.638 |
.071 |
.057 |
.067 |
04-23-97 |
6 |
.052 |
<.010 |
.23 |
.3 |
.427 |
.081 |
.077 |
.052 |
04-26-97 |
834 |
.123 |
.023 |
.35 |
1.7 |
.506 |
.528 |
.096 |
.099 |
05-02-97 |
21 |
.047 |
.021 |
.3 |
.23 |
.825 |
.085 |
.069 |
.073 |
05-07-97 |
17 |
.04 |
.02 |
<.20 |
.32 |
.685 |
.055 |
.038 |
.07 |
05-14-97 |
23 |
.056 |
.032 |
.24 |
.38 |
.367 |
.092 |
.065 |
.064 |
05-22-97 |
21 |
.047 |
.019 |
.34 |
.48 |
.559 |
.15 |
.109 |
.084 |
05-27-97 |
15 |
.055 |
.021 |
.37 |
.4 |
.551 |
.121 |
.109 |
.084 |
06-02-97 |
10 |
.02 |
.01 |
.26 |
.3 |
.413 |
.126 |
.065 |
.078 |
06-17-97 |
24 |
.029 |
.015 |
.26 |
.42 |
.517 |
.111 |
.073 |
.071 |
07-03-97 |
68 |
<.015 |
.011 |
.35 |
.24 |
.602 |
.025 |
.016 |
.027 |
07-14-97 |
31 |
<.015 |
<.010 |
<.20 |
<.20 |
.975 |
.013 |
<.010 |
.027 |
07-22-97 |
27 |
.026 |
<.010 |
.27 |
.29 |
.862 |
.047 |
.031 |
.031 |
07-29-97 |
21 |
<.015 |
<.010 |
<.20 |
<.20 |
.742 |
.019 |
.042 |
.026 |
08-06-97 |
5 |
.023 |
.011 |
<.20 |
<.20 |
.604 |
<.010 |
<.010 |
.016 |
08-12-97 |
6 |
.03 |
<.010 |
<.20 |
.34 |
.339 |
.016 |
.03 |
.029 |
08-21-97 |
12 |
<.015 |
.01 |
<.20 |
<.20 |
.548 |
.057 |
.029 |
.025 |
08-27-97 |
13 |
.015 |
<.010 |
<.20 |
<.20 |
.56 |
.028 |
.021 |
.022 |
09-03-97 |
12 |
.018 |
<.010 |
<.20 |
<.20 |
.433 |
.016 |
.025 |
.016 |
09-09-97 |
10 |
<.015 |
<.010 |
<.20 |
.21 |
.651 |
.016 |
.015 |
.024 |
09-17-97 |
15 |
<.015 |
<.010 |
.23 |
<.20 |
.836 |
.022 |
.023 |
.03 |
09-25-97 |
25 |
.017 |
<.010 |
<.20 |
.28 |
.784 |
.093 |
.027 |
.037 |
10-22-97 |
21 |
<.015 |
<.010 |
<.20 |
<.20 |
1.16 |
.034 |
.027 |
.027 |
Change in MDL for nitrogen, ammonia, dissolved; nitrogen, ammonia plus organic, dissolved; and nitrogen, ammonia plus organic, total for the following analyses; see table 4 |
|||||||||
10-28-97 |
22 |
<.020 |
<.010 |
<.10 |
.13 |
1.12 |
.035 |
.01 |
.023 |
11-06-97 |
18 |
<.020 |
.039 |
<.10 |
.1 |
1.14 |
.021 |
<.010 |
.016 |
11-19-97 |
26 |
.362 |
<.010 |
.14 |
.16 |
1.11 |
.054 |
.029 |
.042 |
12-10-97 |
21 |
<.020 |
<.010 |
<.10 |
<.10 |
.904 |
.031 |
<.010 |
.018 |
12-17-97 |
14 |
<.020 |
.034 |
<.10 |
.14 |
.834 |
.066 |
.061 |
.038 |
12-20-97 |
1,230 |
<.020 |
.021 |
.26 |
1.4 |
.629 |
.456 |
.085 |
.072 |
01-06-98 |
1,180 |
<.020 |
<.010 |
.26 |
.44 |
.565 |
.114 |
.041 |
.064 |
01-12-98 |
25 |
<.020 |
<.010 |
.17 |
.25 |
1.05 |
.079 |
.058 |
.053 |
01-22-98 |
22 |
<.020 |
.015 |
<.10 |
.13 |
1.1 |
.032 |
.01 |
.028 |
01-31-98 |
1,190 |
.036 |
.011 |
.35 |
1.4 |
.726 |
.371 |
.057 |
.052 |
02-19-98 |
18 |
<.020 |
<.010 |
.22 |
.33 |
.406 |
.059 |
.035 |
.039 |
02-21-98 |
1,210 |
.052 |
<.010 |
.27 |
1.4 |
.443 |
.436 |
.075 |
.069 |
03-16-98 |
1,070 |
.036 |
.056 |
.36 |
2 |
.459 |
.545 |
.079 |
.083 |
03-23-98 |
31 |
.04 |
<.010 |
.19 |
.31 |
.517 |
.04 |
.023 |
.027 |
04-27-98 |
10 |
.033 |
<.010 |
.26 |
.26 |
<.050 |
.038 |
.026 |
<.010 |
Back to:
Forward to: Table 7