7.2 proposed criteria (µg/L total silver)

table 7.1

recommended criteria for the protection of
marine and freshwater aquatic life.

Environment	Criteria as total Silver	Conditions
freshwaters	0.05 µg/L as a 30-day average	hardness 100 mg/L
	0.1 µg/L maximum	hardness 100 mg/L
	1.5 µg/L as a 30-day average	hardness > 100 mg/L
	3.0 µg/L maximum	hardness > 100 mg/L
marine waters	1.5 µg/L as a 30-day average	open coast and estuaries
	3.0 µg/L maximum	open coast and estuaries

See Table 7.11 for the calculations leading to these criteria.