Minnesota Administrative Rules

7052.0360 METAL CONVERSION FACTORS.

Metal	Conversion Factors
	Acute	Chronic
Arsenic	1.000	1.000
Cadmium*	0.944	0.909
Chromium (III)	0.316	0.860
Chromium (VI)	0.982	0.962
Copper	0.960	0.960
Lead*	0.791	0.791
Mercury	0.85	N/A
Nickel	0.998	0.997
Silver	0.85	N/A
Zinc	0.978	0.986

*Conversion factors for cadmium and lead are hardness dependent. The values shown are for a hardness of 100 mg/L as calcium carbonate (CaCO₃). The methods for determining the conversion factors for cadmium and lead given the hardness are as follows:

Cadmium

Acute: Conversion Factor (CF) = 1.136672 - [ln (hardness) (0.041838)]

Chronic: CF = 1.101672 - [ln (hardness) (0.041838)]

Lead

Acute and Chronic: CF = 1.46203 - [ln (hardness) (0.145712)]

Statutory Authority:

MS s 115.03; 115.44

History:

22 SR 1466

Published Electronically:

June 16, 2005