## Pivot values for metals

Metal (contaminant) values of $$c_x$$ (mg/kg) for total, partial strong and partial weak digestion methods

total strong weak
Mercury 0.00 0.00 0.00
Arsenic 5.00 3.00 1.50
Chromium 13.00 13.00 10.00
Copper 3.00 1.00 1.00
Nickel 4.00 2.50 2.50
Zinc 13.00 8.00 8.00

Aluminium (normaliser) values of $$n_x$$ and $$n_{ss}$$ (%) for total, partial strong and partial weak digestion methods.

total strong weak
$$n_x$$ 1.4 0.4 0.3
$$n_{ss}$$ 5.8 5.0 4.0

• for chromium, $$n_{ss}$$ is set to 5.0 for all digestion methods
• $$c_x$$ is taken from the partial weak column for arsenic and the partial strong column for all other metals
• $$n_x$$ is set to 0.4 for chromium and 0.3 for all other metals
• $$n_{ss}$$ is set to 5.0 for chromium and 3.2 for all other metals