Heavy metals

(mg/L)

Control

Mixs.

B1

B2

B3

Cu

299.7

0.07

0.11

0.06

Pb

227.5

0.05

ND

ND

As

1380.4

ND

ND

ND

Cd

65.0

ND

ND

ND

Zn

7122.5

0.58

0.70

0.55