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Received May 09, 1994,Revised , Accepted , Available online

Volume 7,1995,Pages 478-483

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The factors afferting ammonia transfer from water to the air were studied in Tianjin and KunmingCity of China. The mass transfer coefficient (Ke) was found to be a hear function of temperature, and increased with increasing wind speed. Ke was independent of pH and concentration of ammonia nitrogen in water. The Ke obtained in Kunming is greater than those in Tianjin under similar test conditions. The Ke hasbeen shown to range from 1. 03 to 1. 52 cm/h in distilled water system. The estimated rates of ammoniatransferred from the surface 0. 2m section of Lake Dianchi Caohai water to the air were 36 to 242 μg - N/(L.h) at different pH and ammonia nitrogen concentrations.

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