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For which compounds, Kjedhal's method i...

For which compounds, Kjedhal's method is not applicable for the estimaiton of nitrogen?

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Kjedahl's method is not applicable to compounds containing nitrogen in the ring (e.r., pyridine, quinoline etc.) and compounds containing nitrogen directly linked to oxygen atom (e.g., `NO_(2))` or another nitrogen atom i.e., azo (- N = N - ) compounds.
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