tˈoʊɾəl kjˈɛldɑːl nˈaɪtɹədʒən ɔːɹ tˌiːkˌeɪˈɛn ɪz ðə sˈʌm ʌv nˈaɪtɹədʒən bˈaʊnd ɪn ɔːɹɡˈænɪk sˈʌbstənsᵻz, nˈaɪtɹədʒən ɪn æmˈoʊniə ˌɛnˈeɪtʃ θɹˈiːˈɛn ænd ɪn æmˈoʊniəm ˌɛnˈeɪtʃ fˈoːɹ plˈʌsˈɛn ɪnðə kˈɛmɪkəl ɐnˈæləsˌɪs ʌv sˈɔɪl, wˈɔːɾɚ, ɔːɹ wˈeɪst wˈɔːɾɚ ˈiː.dʒˈiː. sˈuːɪdʒ tɹˈiːtmənt plˈænt ˈɛfluːənt.
Total Kjeldahl nitrogen or TKN is the sum of nitrogen bound in organic substances, nitrogen in ammonia (NH3-N) and in ammonium (NH4+-N) in the chemical analysis of soil, water, or waste water (e.g. sewage treatment plant effluent).