Data underlying the publication: Risk of Rainfall Caused Leaching from Bio-Composite Material based Building Façades into the Aquatic Environment

The new bio-composite materials are used for different products such as façade building elements . Two new bio-composite materials were analysed. Each material was tested in its new and weathered forms, the latter being subject to cyclic UV irradiation and high humidity to simulate weather conditions. First, two rainfall intensities were selected using the Koninklijk Nederlands Meteorologisch Instituut (KNMI) database, followed by laboratory work including the preparation of synthetic rainwater and leaching tests to determine the potential release of specific chemical substances, such as heavy metals and resin compounds, under different rainfall contidions. The leaching concentrations obtained from these tests were then assessed for their potential impact on surface water quality. Using laboratory test outcomes as a basis, the risk assessment for potential leaching from façade elements into surface waters was conducted. Two scenarios of leaching were analysed, a single rain event of intensity 5 mm/h and duration of 1 hour, and a single rain event of intensity 15 mm/h and duration of 1 hour. In order to overcome the uncertainties caused by the limited input data available, a sensitivity analysis was carried out by first varying the leaching concentrations and then the rainfall intensity. The aim was to evaluate the changes in the PEC/PNEC ratio as a function of these two input parameters and to gain a better understanding of the leaching behaviour as a function of these two parameters.

新型生物复合材料可应用于各类产品，例如建筑外立面构件。本次研究共分析了两种新型生物复合材料。每种材料分别以全新状态和老化状态开展测试：后者通过循环紫外辐照与高湿度环境模拟自然老化条件。首先，基于荷兰皇家气象研究所（Koninklijk Nederlands Meteorologisch Instituut, KNMI）的数据库选取了两种降雨强度；随后开展实验室工作，包括配制合成雨水与淋溶试验，以测定不同降雨条件下特定化学物质（如重金属与树脂类化合物）的潜在释放量。随后，对试验所得的淋溶浓度进行评估，分析其对地表水水质的潜在影响。以实验室测试结果为基础，针对建筑外立面构件的淋出物对地表水造成的潜在风险开展评估。本次分析了两种淋溶情景：其一为降雨强度5毫米/小时、持续1小时的单次降雨事件，其二为降雨强度15毫米/小时、持续1小时的单次降雨事件。为解决因输入数据有限引发的不确定性问题，本研究开展了敏感性分析：依次调整淋溶浓度与降雨强度两个参数。本次分析的目标为：评估PEC/PNEC比值随这两个输入参数的变化情况，并加深对这两个参数影响下淋溶行为的理解。