针对屋面降雨径流水质安全问题，以天津市某大学SBS（改性沥青）屋顶径流为研究对象，结合固相萃取技术，利用发光菌急性毒性试验及SOS/umu遗传毒性试验等生物检测方法，分析了2018年8月两场屋面降雨径流中生物毒性随降雨时间的变化。结果表明，初期径流水质较差，具有较高的急性毒性及遗传毒性，随着时间的延长急性毒性和遗传毒性均呈现降低的趋势，且8月30日径流样品毒性大于8月19日样品毒性；两场降雨中不同时间段径流样品诱导率I_R检测结果均大于2，表现为致突变阳性结果，会引发DNA损伤效应。研究结果为雨水水质安全评价及资源的循环利用提供了可靠数据支持。

Aiming at the safety of roof rainfall runoff water quality,acute toxicity and genetic toxicity in roof rainfall runoff water are investigated by using the luminescent bacteria test and the SOS/umu test associated with solid phase extraction method.The experiment is carried out at a green roof of a university in Tianjin for the rainfall respectively on August 19 and August 30,2018.The results reveal that the roof rainfall runoff water is seriously polluted in the early stage and has high acute toxicity and genetic toxicity.With the extension of time,both the acute toxicity and the genotoxicity decrease gradually.The toxicity of the runoff rainwater samples on August 30 is higher than that of the runoff rainwater samples on August 19.For the samples collected in the two rainfall events,the induction rates I_R are bigger than 2,showing a mutation positive result,which will trigger DNA damage effects.The experimental results provide reliable data support for water quality assessment and recycling of rainwater resources.

高玉婵(1991-),女,硕士生