Reference
Method
Test
Reagent #
Reagent Name
EPA
Colorimetric; Titrimetric; Potentiometric
Nitrogen, Kjeldahl, Total
7.3
Sulfuric Acid – Mercuric Sulfate – Potassium Sulfate Solution
EPA
Potentiometric, Ion Selective Electrode
Nitrogen, Kjeldahl, Total
6.3
Sulfuric Acid – Mercuric Sulfate – Potassium Sulfate Solution
EPA
Colorimetric, Semi-Automated Block Digester, AAII
Nitrogen, Kjeldahl, Total
6.2
Digestion Solution (Sulfuric acid-mercuric sulfate-potassium sulfate solution)
EPA
Colorimetric, Automated, Block Digestor AA II
Phosphorus, All Forms
5.2
Digestion Solution
ASTM
Semiautomated Colorimetric Bertholt
Total Kjeldahl Nitrogen
19.5
Digestion Solution
ASTM
Manual Digestion / Distillation
Total Kjeldahl Nitrogen
11.13
Digestion Solution
APHA
Macro-Kjeldahl Method
Nitrogen (Organic)
3b
Digestion Reagent