Water sampling in Nairobi river
Samples were collected from Nairobi River System at sampling point NA4 situated at coordinates 1◦14 44 S and 36◦59 19 E. Water samples were collected as grab samples in pre-cleaned containers in duplicates and treated with nitric acid (2%). The samples were stored in a cool box and transported to the laboratory. The physical and chemical characterization of the river water was conducted using Standard Methods