新兴污染物BP-3和BP-4的好氧生物降解性能

采用欧洲经济合作与发展组织（OECD）的生物降解测试标准方法——301F测压呼吸计量法，考察了2-羟基-4-甲氧基二苯甲酮（BP-3）和2-羟基-4-甲氧基二苯甲酮-5-磺酸（BP-4）的好氧生物降解性能，并研究了降解动力学及共代谢现象。实验结果表明：BP-3和BP-4的可生物降解率分别为68.36%和41.34%;根据OECD快速降解性判定标准，BP-3划归为易快速降解物质，而BP-4为不易快速降解物质;两种物质的生物降解可用一级动力学描述，半衰期分别为1.986 d和2.806 d;根据欧盟法规《化学品的注册、评估、授权和限制》（REACH法规），BP-3和BP-4均非持久性物质;与苯甲酸钠共存时，BP-3和BP-4的降解过程均表现出共代谢现象。

Aerobic Biodegradability of Emerging Contaminants BP-3 and BP-4

The aerobic biodegradabilities of 2-hydroxy-4-methoxybenzophenone（BP-3） and 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid（BP-4） were studied by 301F manometric respirometry method, the OECD standard method for biodegradability test. Their degradation kinetics and co-metabolic phenomena were also explored. The experimental results show that： The biodegradation rates of BP-3 and BP-4 are 68.36% and 41.34% respectively; According to the OECD criterion of ready biodegradability, BP-3 is an easily degradable substance while BP-4 is difficult to be biodegraded ultimately; The biodegradation of the two substances can be described by the first order kinetics, and their half-lives are 1.986 d and 2.806 d respectively; According to the REACH rule, BP-3 and BP-4 are both non persistent substances; BP-3 and BP-4 can both co-metabolized with sodium benzoate during the degradation process.