Table 1.3.

Different kinds of heavy metal discharge sources in aquatic environs (Fifield and Haines 2000)

Metal	Sources
Iron	“Pigments and paints, fuel, refineries, textile”
Manganese and zinc	“Batteries and electrical, pigments and paints, alloys and solders, pesticides, glass, fertilizers, refineries, fuel”
Lead	“Batteries and electrical, pigments and paints, alloys and solders, pesticides, glass, fertilizers, refineries, fuel, plastic”
Cadmium	“Batteries and electrical, pigments and paints, alloys and solders, plastic, fertilizers, fuel”
Nickel	“Batteries and electrical, pigments and paints, alloys and solders, fertilizers, fuel, catalysts”
Copper	“Batteries and electrical, pigments and paints, alloys and solders, fertilizers, pesticides, fuel, catalysts”
Chromium	“Pigments, fertilizers, textile”