Photometric determination of ortho-phosphate. • Photometric determination as molybdenum blue. • Ammonium molybdate reacts with orthophosphate ions to form phosphomolybdic acid. This is reduced to molybdenum blue. • Reaction basis analog to DIN EN ISO 6878-D11. • Type: standard test 1-77 • Range: 10 mm cuvette: 0,2 - 6,5 mg/l PO4-P / 0,5 - 20,0 mg/l PO43- ; 50 mm cuvette: 0,04 - 1,70 mg/l PO4-P / 0,1 - 5,0 mg/l PO43- • Sufficient for: 440 determinations • Sea water suitability: yes