Ionic strength controls micro(nano)plastics (MNPs) mobility in porous media: A multilevel meta-analysis of solution chemistry, organic matter, and co-contaminant interactions

This repository contains the complete dataset and analysis scripts for the meta-analysis of micro(nano)plastic (MNP) transport in porous media, comprising 2,726 observations extracted from 60 peer-reviewed studies. The data are organized into four Excel files (S1–S4) corresponding to the four meta-regression models examined: solution chemistry (S1, n = 1,019), organic additives (S2, n = 511), collector zeta potential (S3, n = 695), and co-contaminants (S4, n = 501), with supplementary study metadata and quality scores in S5 (n = 60 studies). Key variables include ionic strength, pH, organic matter type and concentration, collector coating type, co-contaminant type and concentration, zeta potential, particle size, and effluent recovery (%). The repository also includes R scripts for conducting the meta-regression analyses, generating publication-quality figures (main and supplementary), performing subgroup and sensitivity analyses, and reproducing all results presented in the manuscript. All analyses were conducted using R version 4.3.1 with the metafor, ggplot2, dplyr, and tidyr packages. This dataset and code enable full reproducibility of the meta-analysis and can be reused for further investigations of MNP transport in porous media.本仓库包含用于多孔介质中微（纳）塑料（micro(nano)plastic，MNP）迁移过程荟萃分析的完整数据集与分析脚本，其数据源自60篇同行评议研究，共计2726条观测记录。本次数据集分为四个Excel文件（S1–S4），分别对应所采用的四类荟萃回归模型：溶液化学特性（S1，n=1019）、有机添加剂（S2，n=511）、收集剂ζ电位（collector zeta potential，S3，n=695）以及复合污染物（co-contaminants，S4，n=501）；另有S5文件包含全部60项研究的补充元数据与质量评分。核心变量包括离子强度、pH值、有机质类型与浓度、收集剂涂层类型、复合污染物类型与浓度、ζ电位、粒径以及出水回收率（%）。本仓库同时包含用于执行荟萃回归分析、生成符合出版规范的图表（主图与补充图）、开展亚组与敏感性分析，以及复现论文中全部结果的R脚本。所有分析均基于R 4.3.1版本及其中的metafor、ggplot2、dplyr与tidyr程序包完成。本数据集与配套代码可实现本次荟萃分析的完全复现，亦可被复用至多孔介质中MNP迁移过程的后续研究中。