Fig. 4. Scanning electron microscopy of (A) aqueous suspension and (B) iron surface following 2 h treatment of metolachlor solution (400 mg L^-1) with 5% (w/v) annealed Fe⁰ + 1% FeSO₄ + 0.5% Al₂(SO₄)₃. Bars on photographs are scaled to approximately 1 µm.