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Compiled literature dataset and analysis code for "Iron-Modified Biochar for Microplastic Removal from Agricultural Irrigation Water: A Critical Analysis of Published Data" Creators — Family name Kim, Given names Jake. Affiliation: Shanghai High School International Department, Shanghai, China.
Summary
Iron-treated charcoal (biochar) shows promise for filtering tiny plastic particles out of water used to irrigate crops, which matters because microplastics in farm water can end up in our food. This paper doesn't run new experiments, it's a careful re-check of existing published research, and it finds that some of the data being cited as evidence is shakier than it looks, including one key measurement that was taken under conditions that don't reflect real-world water. The takeaway: this filtering method is worth pursuing, but the science backing it up needs stronger, more direct evidence before we can be confident it works as well as claimed.
Supporting data for the manuscript "Iron-Modified Biochar for Microplastic Removal from Agricultural Irrigation Water: A Critical Analysis of Published Data" (J. Kim). Every value in this deposit was extracted from work published by other researchers. No experimental measurements were made. The deposit contains the compiled datasets, a record of the origin and evidence level of each value, and the code that produces the paper's four results and Figures 3-6. Contents:- data/ssa_pairs.csv - specific surface area of 7 biochars before and after iron modification- data/surface_charge.csv - points of zero charge and isoelectric points, with electrolyte recorded- data/removal_performance.csv - 12 reported removal efficiencies and 4 adsorption capacities- data/irrigation_loading.csv - water concentrations, yields and physical constants for the mass balance- data/SOURCES.md - full citation and evidence level for every value- analysis/analyse.py - runs the four analyses and writes Figures 3-6- analysis/build_review.py - builds the manuscript from those outputs- analysis/analysis_output.txt - full log including every intermediate number Reproduce with: python3 analyse.py (requires numpy, pandas, scipy, matplotlib, python-docx). Important caveats for reuse. Each value carries an evidence level. Five of the seven paired surface-area values are secondary - quoted in review articles rather than read from the original papers - and should be confirmed before being relied on. The polyethylene isoelectric point of pH 6.59 (Jang et al. 2022) was measured in polyaluminium chloride, a trivalent coagulant that reverses the sign of a negatively charged surface, and therefore does not describe polyethylene in coagulant-free water. Both points are discussed in Section 4.4 of the manuscript.