河川水中での非イオン界面活性剤の生分解性

概要

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River die-away tests with the riverwater collected from the Tama river were used to examine biodegradability of nonionic surfactants, mono alkyl poly (oxyethylene) ether (AE). The progress of biodegradation was followed by the measurement of the loss of total organic carbon (TOC), cobalt thiocyanate active substance (CTAS), and the analysis of dissolved oxygen (DO). The following results were obtained. 1) We found that degrees of both primary and ultimate biodegradation of AE could be obtained by the measure of the loss of TOC alone. 2) At 20℃ of incubation temperature, AE was biodegraded into inorganic compounds in relatively short period. And, the initial biodegradation rates of AE decreased as carbon chain length increased, but the ultimate biodegradation rated were barely dependent on it. The effect of adducted number of ethylene oxide of AE was not evident. 3) At 10℃, the subsequent lag time after primary biodegradation was longer than that at 20℃. Certain amount of organic carbon still remained after 30 day incubation. AEs which had the longer carbon chain and the more EO units made this tendency the more evident. 4) The higher intial concentration decreased biodegradation rates of AE in test water using riverwater.
社団法人日本家政学会の論文
1994-06-15