D.L. Galat S.E. Finger M.S. Kaiser D.P. Monda 1995 <p><span>Toxicity of un-ionized ammonia (NH</span>₃<span>-N) to the midge, </span><i class="EmphasisTypeItalic ">Chironomus riparius</i><span> was compared, using laboratory culture (well) water and sewage effluent (≈0.4 mg/L NH</span>₃<span>-N) in two 96-h, static-renewal toxicity experiments. A generalized linear model was used for data analysis. For the first and second experiments, respectively, LC</span>₅₀<span> values were 9.4 mg/L (Test 1A) and 6.6 mg/L (Test 2A) for ammonia in well water, and 7.8 mg/L (Test 1B) and 4.1 mg/L (Test 2B) for ammonia in sewage effluent. Slopes of dose-response curves for Tests 1A and 2A were equal, but mortality occurred at lower NH</span>₃<span>-N concentrations in Test 2A (unequal intercepts). Response of</span><i class="EmphasisTypeItalic ">C. riparius</i><span> to NH</span>₃<span> in effluent was not consistent; dose-response curves for tests 1B and 2B differed in slope and intercept. Nevertheless, </span><i class="EmphasisTypeItalic ">C. riparius</i><span> was more sensitive to ammonia in effluent than in well water in both experiments, indicating a synergistic effect of ammonia in sewage effluent. These results demonstrate the advantages of analyzing the organisms entire range of response, as opposed to generating LC</span>₅₀<span> values, which represent only one point on the dose-response curve.</span></p> application/pdf 10.1007/BF00213117 en Springer Acute toxicity of ammonia (NH₃-N) in sewage effluent to <i>Chironomus riparius</i>: II. Using a generalized linear model article