Photometric determination of iron. • Photometric determination with diphenylpyridyl triazine • Iron(II) ions react with a triazine derivative to form a violet colour complex. The NANOFIX reagent capsule is required for reduction of Fe(III) to Fe(II) and for pH adjustment. • Type: tube test 0-37 • Range: 0.10 - 3.00 mg/l Fe; when using semi-micro cuvettes 50 mm (Cat. No. 919 50): 0.02 - 1.00 mg/l Fe • Sufficient for; 20 determinations • Sea water suitability: yes