Table 6 Metal concentrations of mixture 1 after acidic attack.

From: Experimental investigation of binder based on rice husk ash and eggshell lime on soil stabilization under acidic attack

Element

Concentration (mg/L)

NBR 10,004 (Annex G) Limita

Solubilized extract RHA (mg/L)

CONAMA 460 limitb

Dutch list limitc

EPA limitd

Ag

*

0.05

*

0.05

–

–

Al

0.020

0.200

0.132

3.50

–

–

As

*

0.01

*

0.01

0.01

0.01

Ba

*

0.70

*

0.70

0.05

2

Cd

*

0.005

*

0.005

0.0004

0.005

Cr

*

0.05

*

0.05

0.001

0.1

Cu

*

2

*

2

0.015

1.3

Fe

*

0.3

 < 0.006

2.45

–

–

Hg

*

0.001

*

0.001

0.00005

0.002

Mn

*

0.1

1.5

0.4

–

–

Na

1.32

200

9.6

–

–

–

Pb

*

0.01

*

0.01

0.015

0.015

Se

*

0.01

*

0.01

–

0.05

Zn

*

5

0.06

1.05

0.065

-

  1. *Below detection limit; asolubilized contaminant contents; bguiding values of groundwater and drinking water; ctarget values of groundwater; dmaximum contaminant levels—national primary drinking water regulations.
Back to article page