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DISCIISSION <br />The effluent samples with an alkalinity of 1110 mg\L or less and a <br />neutral pH range, 7.0 +- 1.0, did not cause significant mortality. <br />This was also the case with the blanks following pH adjustment to <br />neutrality. However, the 100% pure effluent continues to exhibit <br />toxicity. <br />The massive mortality seen in the blanks, and in effluent samples <br />with alkalinities of 95 mg/L and <5.0 mg/L, during the first 24 <br />hours can be attributed to the acid conditions. This was proven by <br />adjusting the pH of each sample to neutral range and finding no <br />significant mortality in the next 24 hours. <br />The 30°s mortality seen in the effluent sample with an alkalinity of <br />1110 mg/L borders on being acutely toxic to the organisms. It is <br />concluded that this mortality, and that seen in the 100% effluent, <br />was caused by the alkaline conditions. This is evident since it <br />- was the only chemical characteristic that differed from those <br />measured for the effluent sample with an alkalinity of 650 mg/L, <br />and the neutral pH adjusted samples. <br />-5- <br />COMMER CIAL TESTING & ENGINEERING CO. <br />Dina' Cppv Water marketl <br />=o' Vour Protecu on <br />