Field-Governed Rare-Ion Capture from Seawater (FG-RIC)

This paper introduces the **Field-Governed Rare-Ion Capture (FG-RIC)** architecture — the first application of active electromagnetic field governance to the selective extraction of economically critical trace ions from bulk seawater. FG-RIC replaces the slow, diffusion-limited kinetics of passive adsorption with a field-driven ion-transport regime whose extraction rate is governed by applied field parameters rather than by ocean diffusion timescales. The result is a modular, programmable, reagent-free extraction system capable of recovering uranium, lithium, strontium, and rare-earth elements (REEs) from unmodified seawater at coastal infrastructure scale. The architecture is the liquid-phase expression of the **Griffiths Canon** field-governance discipline — the same principle applied across the Canon to plasma confinement (CSFR), propulsion nozzle shaping (REMN/GREMN), and microwave cracking governance (CSMMC) — adapted here to the challenge of steering multiply-charged ions through a conductive saline medium without electrolysis, without chemical addition, and without process disruption. --- ## The Resource Case Seawater is not merely a water feedstock. It is a dilute ore stream of global scale: - **Uranium** at ~3.3 µg/L — approximately 4.5 billion tonnes dissolved in the global ocean, roughly 750× known terrestrial reserves, at an indicative spot value of ~USD 130/kg (U₃O₈)- **Lithium** at ~0.17 mg/L — over 230 billion tonnes in the ocean, more than 10,000× terrestrial reserves, at ~USD 12/kg (Li₂CO₃ equivalent) with sustained battery-market demand- **Strontium** at ~8 mg/L — a mature industrial commodity used in electronics, pyrotechnics, and medical imaging- **Rare-Earth Elements (REEs)** at 1–10 ng/L — the highest unit-value recovery target; characteristic high charge states (+3 to +4) confer strong electrophoretic response and distinctive AC resonance behaviour The barrier to accessing these resources has never been geological scarcity. It has been the absence of an extraction architecture capable of overcoming diffusion-limited transport at the required throughput. FG-RIC is that architecture. --- ## The Technical Problem FG-RIC Solves Existing seawater extraction technologies rely on passive adsorption. Amidoxime-functionalised polymer fibres are deployed in open seawater and recovered after weeks of immersion. Ion uptake is governed by Brownian diffusion and convective encounter rates — a stochastic, concentration-independent process that cannot be accelerated by infrastructure investment. Cycle times are measured in weeks; fouling by biological growth and competing ions is chronic; physical deployment and retrieval of adsorbent material at ocean scale is operationally intensive; and the approach is not compatible with existing coastal plant infrastructure. FG-RIC's core contribution is a change of mechanism. The extraction rate in FG-RIC is governed by the applied electric field gradient, not by diffusion. An ion at seawater dilution responds to a potential gradient with a drift velocity proportional to its electrophoretic mobility — and that mobility scales with charge state and hydration shell structure, not with concentration. Uranium as UO₂(CO₃)₃⁴⁻ (charge −4), lithium as Li⁺ under AC resonance excitation, and REEs as Ln³⁺/⁴⁺ complexes all present electrophoretic signatures that are meaningfully distinct from the dominant NaCl matrix, enabling selective field-driven transport toward capture surfaces at rates orders of magnitude faster than passive diffusion. The architecture operates below the electrolysis threshold throughout all capture modes (DC bias