Data for: “Evaluation of contaminant retention in the soil of Sustainable Drainage Systems: methodological reflections on the determination of sorption isotherms”

The reported data have been acquired within a research project investigating the ability of infiltration-based Sustainable Drainage Systems to mitigate pollutant fluxes in stormwater runoff. Sorption experiments have been carried out in batch systems, in order to characterize the sorption behavior of three soils towards copper and zinc, and one soil towards four organic micropollutants: Bisphenol A (BPA), 4-tert-Octylphenol (OP), 4-Nonylphenol (4NP), and Nonylphenol Ethoxylate (NP10). The soil samples originate from three source-control infiltration facilities.
• Soil 1 is a sandy loam from a roadside swale;
• Soil 2 is a silt loam from a roadside filter strip;
• Soil 3 is a sandy clay loam from an infiltration basin.

All experiments were carried out in non-competitive systems (i.e., individual contaminants in each batch system). The “reference conditions” corresponded to an electrolyte solution which mimicked the composition of runoff water (Evian and ultrapure water, volumetric ratio of 1:10). The sorption behavior of metals onto soils 1 and 3 was also investigated in different conditions:
• 1.0 g/L of sodium chloride, to investigate the effects of deicing salt in runoff water;
• 10 mg/L of humic acids, to represent the natural generation of dissolved organic matter in the soil solution.

The methodology used to select the experimental conditions is thoroughly described in a research article entitled: “Evaluation of contaminant retention in the soil of Sustainable Drainage Systems: methodological reflections on the determination of sorption isotherms” (Blue-Green Systems 1(1), doi: 10.2166/bgs.2019.196).

The appended files present the experimental points of the sorption isotherms for each characterized soil.
• Soil 1: metals in the reference conditions (Metals_ref), metals with sodium chloride (Metals_NaCl), metals with humic acids (Metals_HA), organic micropollutants;
• Soil 2: metals in the reference conditions;
• Soil 3: metals in the reference conditions, metals with sodium chloride, metals with humic acids.

The concentrations in the dissolved phase are referred to as “X_diss”, where X is the studied species (Cu, Zn, etc.), and are expressed in mg/L. BPA stands for Bisphenol A, OP stands for 4-tert-Octylphenol, 4NP stands for 4-Nonylphenol, and NP10 stands for Nonylphenol Ethoxylate. The contents in the solid phase are referred to as “X_sorb” and are expressed in mg/kg.
In case the tests were carried out in duplicates, the columns “X_diss” and “X_sorb” correspond to the mean values of the experiments; two additional columns, referred to as “sdX_diss” and “sdX_sorb”, provide the standard deviations (also expressed in mg/L and mg/kg, respectively).

本研究数据源自一项探究基于入渗的可持续排水系统（Sustainable Drainage Systems）缓解雨水径流中污染物通量的科研项目。本研究通过批量体系开展吸附实验，以表征三种土壤对铜（Cu）、锌（Zn）的吸附行为，以及一种土壤对四种有机微污染物的吸附行为：双酚A（Bisphenol A, BPA）、4-叔辛基苯酚（4-tert-Octylphenol, OP）、4-壬基苯酚（4-Nonylphenol, 4NP）以及壬基酚聚氧乙烯醚（Nonylphenol Ethoxylate, NP10）。土壤样品取自三处源头控制型入渗设施。
• 土壤1为取自路边渗沟的砂质壤土；
• 土壤2为取自路边过滤带的粉砂壤土；
• 土壤3为取自入渗池的砂质黏壤土。
所有实验均在非竞争性体系中开展（即每个批量体系仅包含单一污染物）。"参考条件"指模拟径流水质的电解质溶液（依云矿泉水与超纯水按1:10体积比混合）。针对土壤1和土壤3的金属吸附行为还在不同条件下进行了探究：
• 1.0 g/L氯化钠溶液，以探究径流中融雪盐的影响；
• 10 mg/L腐殖酸溶液，以表征土壤溶液中溶解性有机质的自然生成情况。
实验条件的选择方法在一篇题为《可持续排水系统土壤中污染物滞留评估：吸附等温线测定的方法学反思》（Blue-Green Systems 1(1), doi: 10.2166/bgs.2019.196）的研究论文中进行了详细阐述。
附录文件包含了每种表征土壤的吸附等温线实验数据点：
• 土壤1：参考条件下的金属污染物（Metals_ref）、添加氯化钠的金属污染物（Metals_NaCl）、添加腐殖酸的金属污染物（Metals_HA）以及有机微污染物；
• 土壤2：参考条件下的金属污染物；
• 土壤3：参考条件下的金属污染物、添加氯化钠的金属污染物、添加腐殖酸的金属污染物。
溶解相中的浓度记为"X_diss"，其中X为研究对象（如Cu、Zn等），单位为mg/L。BPA代表双酚A，OP代表4-叔辛基苯酚，4NP代表4-壬基苯酚，NP10代表壬基酚聚氧乙烯醚。固相中的含量记为"X_sorb"，单位为mg/kg。
若实验设置了平行重复，则"X_diss"与"X_sorb"列对应实验的平均值；另有两列分别为"sdX_diss"和"sdX_sorb"，分别提供标准偏差（单位同样为mg/L与mg/kg）。