Section 31: EQUIPMENT AND REAGENTS
EQUIPMENT
1. Kjeldahl digestion apparatus
2. Heating unit capable of heating a 250 mL sample from 25°C to boiling within 5 minutes
3. Fume hood or exhaust fume ejector
4. Equipment for distillation and measurement of ammonia nitrogen
REAGENTS
1. Kjeldahl digestion reagent consisting of:
Concentrated Sulfuric acid
Potassium Sulfate
Mercuric Oxide
2. Phenolphthalein indicator
3. Sodium hydroxide - Sodium thiosulfate reagent
4. Borate buffer solution
5. Sodium hydroxide 6 N
6. Reagents for distillation and measurement of Ammonia nitrogen
See Appendix B for the procedures for preparation of the reagents used in this method.