Acute Toxicity of Fire Control Chemicals to Daphnia magna (Straus) and Selenastrum capricornutum (Printz)

Table 2

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 Waters^a

Chemical	Water type	Exposure
		24 hr	48 hr
Fire-Trol GTS-R	Soft	780^b	257a
			(211-327)
	Hard	>780^c	339w
			(270-418)
Fire-Trol LCG-R	Soft	1007^d	848b
		(780-1300)	(662-1036)
	Hard	1676^d	813x
		(1300-2160)	(627-992)
Phos-Chek D75-F	Soft	188	140*c
		(124-256)	(113-177)
	Hard	280	280w
		(230-365)	(224-386)
Phos-Chek WD-881	Soft	15	11*d
		(11-18)	(9-14)
	Hard	8	4y
		(4-13)	(3-5)
Silv-Ex	Soft	10	7e
		(8-15)	(6-9)
	Hard	7	7z
		(6-9)	(5-8)

^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.

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