Table 10.

Concentration of heavy metals in water and sediment samples collected from Gwadar and Karachi Coasts of Pakistan.

Metal	Water samples (mg/kg)		Sediments (mg/kg)		WHO limit (mg/kg or ppm)
	G	K	G	K
	Mean ± S.D	Mean ± S.D	Mean ± S.D	Mean ± S.D
Pb	17.32 ± 0.03	21.21 ± 0.01	19.42 ± 0.05	23.32 ± 0.02	0.50
Cu	6.62 ± 0.005	8.12 ± 0.05	7.28 ± 0.01	8.77 ± 0.03	2.0
Fe	22.52 ± 0.01	24.21 ± 0.06	23.01 ± 0.01	25.76 ± 0.07	0.3
Cd	3.81 ± 0.05	5.64 ± 0.04	4.95 ± 0.02	6.15 ± 0.05	0.7
Cr	5.93 ± 0.02	6.83 ± 0.03	6.41 ± 0.04	7.39 ± 0.04	0.1