Toxic effect on fish and plankton. Forms corrosive
mixtures with water even if diluted. Damage to plant
growth. The following applies to Hydrochloric acid
general: Harmful effect on aquatic organisms. Harmful
effect due to pH shift. Biological effects: Hydrochloric acid
(including such due to reaction): lethal for fish as from
25mg/l; Leuciscus idus LC50: 862 mg/l (1N solution).
Harmful effects begin at plants: 6mg/l
Does not cause biological oxygen deficit. Do not allow to
enter waters, waste water or soil.