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Table 4 Concentrations of some heavy metals in the studied water samples used in irrigation in (mg L−1)

From: Effect of contamination sources on the rate of zinc, copper and nickel release from various soil ecosystems

Location

Cd

Pb

Mn

As

Cr

Zn

Ni

Cu

Safe levela

0.01

5.00

0.20

0.05

0.01

2.00

0.20

0.20

NW(El-Kalubia)

0.01

0.02

0.01

Kombora

0.33

0.46

9.51

0.7

2.49

0.12

Abo Rawash

0.35

0.43

12.85

1.08

2.35

0.12

Kafr-Elsheikh

0.35

0.43

12.85

1.08

2.35

0.12

  1. aAccording to ATSDR (1993)