Table 3.
Average anion concentrations upstream (Us) and downstream (Ds) of Mvudi River.
| Anions (mg/L) | Sampling Months | |||||
|---|---|---|---|---|---|---|
| January | February | March | April | May | June | |
| Fluoride Us | 0.052 ± 0.01 | 0.098 ± 0.01 | 0.131 ± 0.0 | 0.056 ± 0.04 | 0.068 ± 0.09 | 0.069 ± 0.08 |
| Ds | 0.06 ± 0.01 | 0.110 ± 0.01 | 0.159 ± 0.06 | 0.068 ± 0.04 | 0.130 ± 0.06 | 0.113 ± 0.05 |
| Chloride Us | 5.32 ± 0.29 | 7.33 ± 0.18 | 9.93 ± 2.97 | 9.15 ± 0.66 | 12.13 ± 3.15 | 12.79 ± 2.95 |
| Ds | 5.73 ± 0.23 | 9.68 ± 0.64 | 15.37 ± 11.64 | 9.33 ± 0.12 | 12.31 ± 6.95 | 22.79 ± 13.98 |
| Nitrate Us | 4.75 ± 5.92 | 1.43 ± 0.01 | 3.07 ± 1.39 | 2.06 ± 0.85 | 9.36 ± 11.46 | 5.21 ± 1.53 |
| Ds | 7.03 ± 6.94 | 2.38 ± 0.40 | 3.01 ± 1.49 | 6.95 ± 4.24 | 9.16 ± 3.30 | 12.56 ± 6.43 |
| Sulphate Us | 1.52 ± 0.01 | 1.14 ± 0.33 | 2.29 ± 0.30 | 0.641 ± 0.05 | 0.695 ± 0.13 | 0.834 ± 0.21 |
| Ds | 3.35 ± 2.49 | 2.26 ± 0.27 | 6.29 ± 3.36 | 1.34 ± 0.09 | 0.767 ± 0.16 | 0.654 ± 0.09 |