Reference
Method
Test
Reagent #
Reagent Name
EPA
Colorimetric, Automated, Single Reagent
Phosphorus, All Forms
7.8
Stock Phosphorus Solution, 1 mL = 0.05 mg P
ASTM
Colorimetric Ascorbic Acid Reduction
Phosphorus
12.4
Stock Solution (1.0 mL = 0.05 mg Phosphorus)
APHA
Ascorbic Acid Method
Phosphorus
3f
Stock Phosphate Solution
APHA
Stannous Chloride Method
Phosphorus
3e
Standard Phosphate Solution
APHA
Vanadomolybdophosphoric Acid Colorimetric Method
Phosphorus
3e
Standard Phosphate Solution