#inhuletsriver — Public Fediverse posts

🧪 Aquatic zinc speciation modeling across the Inhulets River (September 2025) highlights why total metal concentrations fail to reflect true ecotoxicity:

☝️ Key Hydrogeochemical Trends:
🔹 Free aqua-ion (Zn²⁺): Dominates at most stations (57–64%). This fraction is the most bioavailable and drives aquatic toxicity.
🔹 Carbonate complex (ZnCO₃⁰): Secondary background form (18–24%), facilitating conservative transit migration.
🔹 Sulfate complex (ZnSO₄⁰): Consistently 6–11% due to elevated background sulfate mineralization.
🔹 Shift at Sample Point 6_1 (pH 8.66): Alkaline buffering radically alters speciation—free Zn²⁺ drops to 32%, while ZnCO₃⁰ becomes dominant (49%) alongside rising ZnOH⁺ (8%).

Methodology:
⚙️ Speciation: PHREEQC (Thermoddem database)
⚙️ Pipeline & Dataviz: R (tidyverse, ggplot2)
⚙️ Minor species (<0.5%) aggregated into "Other" (Інші форми).

#Hydrogeochemistry #PHREEQC #RStats #WaterQuality #EnvironmentalDataScience #InhuletsRiver #KryvyiRih #Geochemistry #OpenScience #Mining #IronOreMining