4
Kjeldahl method is used to determine which of the following parameters in the sample
EXPLANATION
Organic Waste Characterization
- Kjeldahl Method for Total Nitrogen Determination:
- Analytical Procedure:
- Digestion: Sample organic matter is digested with concentrated sulfuric acid (H$_2$SO$_4$) and catalysts (CuSO$_4$, K$_2$SO$_4$), converting organic nitrogen into ammonium sulfate ($(NH_4)_2SO_4$).
- Distillation: Neutralized with concentrated NaOH to liberate ammonia gas (NH$_3$), which is steam-distilled into a boric acid receiving solution.
- Titration: Ammonium borate is quantified by acidimetric titration against standardized HCl or H$_2$SO$_4$.
- Measured Parameter: Total Kjeldahl Nitrogen (TKN), which is used to compute crude protein content ($\text{Protein} = N \times 6.25$).
- Conclusion: Nitrogen (Option 1).
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