Assessment of Health Risks in Wheat Crop Irrigated by Manka Canal, Dera Ghazi Khan, Pakistan

Table 4

Comparison of concentrations (mg/l) of essential and nonessential/toxic metals in reference and in studied water samples.

Sample type	Essential elements				Nonessential elements
	Cu	Fe	Mn	Zn	Cd	Ni	Pb
R1	7.94	45.50	23.95	10.70	ND	0.04	0.01
Present work (average)	6.40 ± 2.01	42.50 ± 5.41	19.89 ± 1.41	34.51 ± 4.01	0.04 ± 0.008	0.91 ± 0.05	0.99 ± 0.11
WHO limit	1.5	5.0	0.9	2.0	0.01	0.2	0.10