Data from : Benzalkonium runoff from roofs treated with biocide products - In situ pilot-scale study.

The dataset gives the concentrations of benzalkonium chloride (C12 and C14), a biocide used for tile roof maintenance, to fight against moss, lichens and algae, in the runoff of 10 pilote scale roof frames. Concentrations were measured over a one year period following biocidal tratment of the roof frames. Results show a major contamination of roof runoff immediately after treatment (from 5 to 30 mg/L), followed by an exponential decrease. 175 to 375 mm of cumulated rainfall is needed before the runoff concentrations become less than EC50 values forfish (280mg/l). The residual concentration in the runoff water remains above 4mg/L even after 640 mm of rainfall. The level of benzalkonium ions leaching depends on the roofing material, with lower concentrations and total mass leached from ceramic tiles than from concrete tiles, and on the state of the tile (new or worn out).

本数据集记录了10个试点规模屋顶框架径流水中苯扎氯铵（benzalkonium chloride，C12和C14型）的浓度——该杀生剂被用于瓦片屋顶养护，以对抗苔藓、地衣与藻类。研究团队在对屋顶框架实施杀生剂处理后，开展了为期一年的浓度监测。结果显示，处理后即刻屋顶径流便出现显著污染（浓度范围为5~30 mg/L），随后浓度呈指数级下降。当径流浓度降至鱼类半数效应浓度（EC50，280 mg/L）以下时，累计降雨量需达到175~375 mm。即便累计降雨量达到640 mm，径流水中的残留浓度仍高于4 mg/L。苯扎氯铵离子的淋溶水平受屋面材料与瓦片状态（全新或老旧）共同影响：与混凝土瓦片相比，陶瓷瓦片淋溶出的浓度与总淋溶量均更低。