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

Table 4

Table 4. Summary of the Ammonia Characteristics of Five Fire-Fighting Chemicals Used in Tests with Neonate D. magna Exposed in ASTM Soft and Hard Waters
ChemicalWater typeRegression equationEC50 (mg/liter)Total ammonia (NH3-N,b mg/liter) EC50Un-ionizeda ammonia (mg/liter)
Fire-Trol GTS-RSoftNH3-N = -0.736 + 0.250× EC50
Adj R2 = 0.9996		 25751.950.73-2.70
HardNH3-N = -0.249 + 0.240× EC50
Adj R2 = 0.9999		 33981.111.96-4.86
Fire-Trol LCG-RSoftNH3-N = -1.541 + 0.109 × EC50
Adj R2 = 0.9996		 84890.890.56-2.37
HardNH3-N = -2.822 + 0.119 × EC50
Adj R2 = 0.9993		 81394.740.57-2.15
Phos-Chek D75-FSoftNH3-N = -0.244 + 0.175 × EC50
Adj R2 = 0.9998		 14024.260.15-0.32
HardNH3-N = 2.032 + 0.179 × EC50
Adj R2 = 0.9998		 28052.150.48-0.89
Phos-Chek WD-881SoftNH3-N = 0.0799 + 0.000234 × EC50
Adj R2 = -0.4525		 110.080.00
HardNH3-N = 0.0509 + -0.000207 × EC50
Adj R2 = 0.9782		 40.050.00
Silv-ExSoftNH3-N = 0.0705 + 0.00748 × EC50
Adj R2 = 0.9995		 70.120.00-0.01
HardNH3-N = 0.0521 + 0.00768 × EC50
Adj R2 = 0.9994		 70.110.01-0.02
Note. A regression equation was fitted for each chemical tested using the total ammonia as nitrogen(NH3-N) concentrations determined at test initiation (N = 4). Each regression model was used to predict NH3-N (mg/liter) at the 48-hr ED50.
a Un-ionized ammonia, total ammonia adjusted for temperature and pH.
b NH3-N, total ammonia as nitrogen (mg/liter) used as dependent variable in regression model; EC50 =48-hr EC50 (mg/liter) used as independent variable in regression model; adjusted R2, 1 - (1 - R2) (n - 1/df error).
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