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A modified diffusive gradients in thin films (DGT) technique uses both a mixed binding layer (PrCH and A520E resins for NH₄-N and NO₃-N, respectively) and multiple binding layers (Metsorb binding layer for PO₄-P overlying the mixed binding layer) for the simultaneous measurement of dissolved inorganic nitrogen (nitrate and ammonium) and phosphate in freshwater (INP-DGT). High uptake and elution efficiencies were determined for a mixed (PrCH/A520E) binding gel for dissolved inorganic nitrogen and an agarose-based Metsorb binding layer for PO₄-P. Diffusion coefficients (D) obtained from DGT time-series experiments (conductivity 180áμSácm⁻¹) for NH₄-N, NO₃-N and PO₄-P agreed well with those measured using individual DGT techniques in previous studies, but were characterised over a wider range of ionic strengths here. D for NO₃-N and PO₄-P were constant over a range of ionic strengths …