Photometric determination of iron. • Photometric determination with 1,10-phenanthroline. • Iron(II) ions react with 1,10-phenanthroline to from an orange colour complex. This method determines dissolved and easily soluble iron compounds. • Type: standard test 1-36 • Range: 10 mm cuvette: 0.1 - 15.0 mg/l Fe ; 50 mm cuvette: 0.01 - 2.00 mg/l Fe • Sufficient for: 250 determinations • Sea water suitability: yes