Toxicidade aguda da amônia para Artemia sp / Acute toxicity of ammonia for Artemia sp

ABSTRACT

The acute toxicity of total ammonia-N, (NH3 + NH4+), and un-ionized ammonia-N, NH3-N, on newly hatched Artemia mauplii and Artemia adults was measured in 24, 48, 72, and 96-h semistatic bioassayssystem. There was a significant difference (p < 0.05) in medial lethal concentrations (LC50) obtained during the tests. The LC50 values on nauplii ranged from 650 mg/l, in 24-h, to 399,1 mg/l total ammonia-N, in 96-h, while the LC50 values on adults ranged from 1290.4 mg/l to 600.5 mg/l total ammonia-N, in the same period. Two methods for calculations of un-ionized ammonia toxicity are analyzed and discussed