2.3 Sampling and analysis
Thirty sample locations are identified based on the high densified
resident, agricultural activities, and waste disposal site in the study
area. The samples were collected in the prewashed polyethylene bottles
and followed preservatives techniques to improve the accuracy of the
results. A physical characteristic such as pH, electrical conductivity,
and total dissolved solids are measured during the sample collection.
Major cations such as calcium, magnesium, sodium, and potassium, major
anions such as chloride, sulphate, nitrate, fluoride, carbonate, and
bicarbonate are measured in the laboratory methods recommended by
American Public Health Association (APHA, 1995).