Reference
Method
Test
Reagent #
Reagent Name
EPA
Colorimetric; Titrimetric; Potentiometric
Nitrogen, Kjeldahl, Total
7.4
Sodium Hydroxide-Sodium Thiosulfate Solution
ASTM
Manual Digestion / Distillation
Total Kjeldahl Nitrogen
11.11
Sodium Hydroxide-Sodium Thiosulfate Solution
APHA
Macro-Kjeldahl Method
Nitrogen (Organic)
3b
Sodium Hydroxide-Sodium Thiosulfate Reagent
APHA
Semi-Micro-Kjeldahl Method
Nitrogen (Organic)
3
Sodium Hydroxide-Sodium Thiosulfate Reagent