"Iron(III)-Chelex Resin Complex as a Prototypical Heterogeneous Catalyst for Phosphoester Hydrolysis"   Catal. Commun. 2003, 4, 549–553.  
Lykourinou-Tibbs, V.; Ercan, A.; Ming, L.-J.

The Fe³⁺ complex (but not Cu²⁺ and Zn²⁺ complexes) of the cross-linked polystyrene Chelex resin is found to be an efficient and selective catalyst toward phosphodiester hydrolysis.  The hydrolysis of bis-(p-nitrophenyl)phosphate (BNPP) hydrolysis by Fe³⁺-Chelex complex exhibits a pre-equilibrium kinetics with a second-order catalytic proficiency (in terms of rate = k₂ [Fe-Chelex][BNPP]) reaching one million at ambient temperature and pH 9.0. 

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