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Abiotic degradation of four phthalic acid esters in aqueous phase under natural sunlight irradiation

查看全文 作　　者：Ruttapol [1]Lertsirisopon;Satoshi [1]Soda;Kazunari [1]Sei;Michihiko [1]Ike 高影响力作者 机构地区：[1]Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka,Suita 565-0871, Osaka, Japan高影响力机构 出　　处：《Journal of Environmental Sciences》索引2009年第21卷第3期,共6页高影响力期刊 摘　　要：Abiotic degradability of four phthalic acid esters(PAEs) in the aquatic phase was evaluated over a wide pH range 5-9.The PAE solutions in glass test tubes were placed either in the dark and under the natural sunlight irradiation for evaluating the degradation rate via hydrolysis or photolysis plus hydrolysis,respectively,at ambient temperature for 140 d from autumn to winter in Osaka,Japan.The effciency of abiotic degradation of the PAEs with relatively short alkyl chains,such as butylbenzyl phthalate(BBP) and di-n-butyl phthalate(DBP),at neutral pH was significantly lower than that in the acidic or alkaline condition.Photolysis was considered to contribute mainly to the total abiotic degradation at all pH.Neither hydrolysis nor photolysis of di-ethylhexyl phthalate(DEHP) proceeded significantly at any pH,especially hydrolysis at neutral pH was negligible.On the other hand,the degradation rate of di-isononyl phthalate(DINP) catalyzed mainly by photolysis was much higher than those of the other PAEs,and was almost completely removed during the experimental period at pH 5 and 9.As a whole,according to the half-life(t1/2) obtained in the experiments,the abiotic degradability of the PAEs was in the sequence:DINP(32-140 d) > DBP(50-360 d),BBP(58-480 d) > DEHP(390-1600 d) under sunlight irradiation(via photolysis plus hydrolysis).Although the abiotic degradation rates for BBP,DBP,and DEHP are much lower than the biodegradation rates reported,the photolysis rate for DINP is comparable to its biodegradation rate in the acidic or alkaline condition. 关 键 词：邻苯二甲酸酯 非生物降解 阳光照射 自然光 生物降解率 水相 pH范围 抗生素后效应
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