Table 4. Approximate Mass of Antibiotics [g] within Lagoons, Groundwater, Management Unit Surface, and Within the 0−30 cm Soil Horizon Calculated by Multiplying the Average Concentration with the Lagoon Volume, Groundwater Volume in the Monitoring Well Source Area and Areas of Each Management Unit, Respectivelya.
| Dairy I |
Dairy II |
||||||||
|---|---|---|---|---|---|---|---|---|---|
| lagoon | lagoon sediments | ground water | surface | soil | lagoon | ground water | surface | soil | |
| tylosin | − | − | − | − | − | − | 0.01 | − | − |
| sulfadimethoxine | 402 | − | 0.1 | 34 | − | 36 | 0.01 | 1 | 7 |
| sulfamethazine | 550 | 316 | 4.1 | 6 | − | 14 | 0.3 | 9 | 170 |
| sulfamethoxazole | 103 | − | − | 4 | − | − | − | 31 | − |
| total chlorotetracycline | − | 1543 | − | 1 | − | − | − | − | − |
| iso-chlorotetracycline | 42 | − | − | − | − | 3 | − | − | − |
| epi-iso-chlortetracycline | 29 | − | − | − | − | 2 | − | − | − |
| oxytetracycline | 18 | 956 | − | 30 | − | 11 | − | 180 | − |
| tetracycline | 2 | 368 | − | 76 | − | 6 | − | 1 | 55 |
| epi-tetracycline | 6 | − | − | 98 | − | 1 | − | 0.3 | − |
| lincomycin | − | − | 0.2 | − | − | 3 | 2.2 | − | − |
| trimethoprim | 0.4 | − | − | − | − | − | − | − | − |
| total erythromycin A | − | − | − | 767 | − | − | − | − | − |
a
Assumptions are well source area 15 m wide by 100 m long and affecting an average depth below the water table of 3.5 m with aquifer porosity of 30%, surface depth 5 cm, soil depth 30 cm, the soil density 1.8 g cm−3, the lagoon sediment depth 0.8m, the lagoon sediment density 1.0 g cm−3, and lagoon sediment moisture content 40%. Lagoon sediments at Dairy II were not collected.