Northern Prairie Wildlife Research Center
Table 2. Acute Toxicity (EC50; mg/liter; 95% Confidence Interval in Parentheses) of Five Fire-Fighting Chemicals to Neonate D. magna Exposed in ASTM Soft and Hard Watersa
a Values with different letters (a-e for comparisons in soft water; w-z for comparisons in hard water) or an asterisk (for comparison between soft and hard waters for each test chemical) are significantly different (P = 0.05).
b 50% of the animals in the highest concentration were immobilized.
c 40% of the animals in the highest concentration were immobilized.
d No partial effect; 95% confidence interval: lower limit, highest test concentration with 0% mortality; and upper limit. lowest test concentration with 100% mortality.