(o-phosphate and total phosphorous) Method: Photometric, PMB 0.05 - 5.00 mg/L (PO4-P), 0.2 - 15.3 mg/L (PO43-), 0.11 - 11.46 mg/L (P2O5), Spectroquant ® The method is analogous to EPA 365.2+3, APHA 4500-P E, and DIN EN ISO 6878. The Spectroquant ® Phosphate Cell Test allows the accurate...