Chi Jie, Li Bin, Wang Qian Y, Liu Hua
School of Environmental Science and Engineering, Tianjin University, Tianjin, China.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2007 Feb;42(2):179-83. doi: 10.1080/10934520601011353.
Influences of major nutrients (N, P) on the biodegradation and bioconcentration of dibutyl phthalate (DBP) and di-2-ethylexyl phthalate (DEHP) by Chlorella vulgaris in lake water were investigated in this work. Our study demonstrated that nutrient addition obviously influenced biodegradation rate constants and apparent bioconcentration factors (BCFs) of DBP and DEHP in Chlorella vulgaris. The effects of P addition on biodegradation were less pronounced than the effects of N addition as a result of N-limitation status of phytoplankton in the lake water, while addition of both N and P more greatly affected biodegradation than addition of N or P. BCFs of DBP and DEHP decreased with increasing algal exudate as measured by dissolved organic carbon (DOC) and a strong correlation between BCFs and DOC was obtained. The results indicate that DOC plays an important role in the bioconcentration of DBP and DEHP.
本研究考察了主要营养元素（氮、磷）对小球藻在湖水中对邻苯二甲酸二丁酯（DBP）和邻苯二甲酸二（2-乙基己基）酯（DEHP）的生物降解及生物富集的影响。我们的研究表明，添加营养元素明显影响了小球藻中DBP和DEHP的生物降解速率常数及表观生物富集因子（BCF）。由于湖水中浮游植物处于氮限制状态，添加磷对生物降解的影响不如添加氮明显，而同时添加氮和磷比单独添加氮或磷对生物降解的影响更大。以溶解有机碳（DOC）衡量，DBP和DEHP的BCF随藻类分泌物增加而降低，且BCF与DOC之间存在强相关性。结果表明，DOC在DBP和DEHP的生物富集中起重要作用。
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