Total Phosphorus Calculator
Definition: Total phosphorus includes phosphorus present in dissolved and particulate forms. After appropriate digestion, phosphorus is converted to reactive orthophosphate and measured colorimetrically.
Total P (mg/L as P) =
[(A − b) / m] × DF
A = absorbance of digested sample
b = calibration curve intercept
m = calibration curve slope
DF = overall dilution factor
Method basis: Standard Methods for the Examination of Water and Wastewater, 4500-P B — Sample Preparation, followed by 4500-P E — Ascorbic Acid Method.