Element

pH

Iron (mg/l)

Aluminium (mg/l)

Zinc

(mg/l)

Copper (mg/l)

Lead (mg/l)

Arsenic (mg/l)

Magnesium (mg/l)

Cadmium (mg/l)

Upper range

2.8

550

90

60

25

0.40

1.60

90

0.20

Lower range

2.2

150

40

22

15

0.2

0.40

40

0.1