Table 2.

Average monthly concentrations of anions in Mvudi River.

Anions (mg/L)	Sampling Months
	January	February	March	April	May	June
Fluoride	0.058 ± 0.01	0.106 ± 0.01	0.15 ± 0.05	0.064 ± 0.04	0.105 ± 0.06	0.105 ± 0.06
Chloride	5.59 ± 0.31	8.90 ± 1.27	13.56 ± 9.53	9.27 ± 0.14	15.75 ± 6.21	19.48 ± 12.0
Nitrate	5.25 ± 4.72	1.97 ± 0.52	2.53 ± 1.37	4.86 ± 3.88	7.75 ± 5.86	8.17 ± 5.52
Sulphate	2.79 ± 2.1	1.89 ± 0.63	5.04 ± 3.36	0.66 ± 0.07	0.74 ± 0.15	0.76 ± 0.15